### Broker Initialization and Launching (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1io_1_1broker-members

Methods related to the lifecycle management of IO brokers. 'init_broker' performs initial setup for abstract brokers, while 'launch' starts the execution of an abstract broker, optionally in a lazy or hidden mode. 'initialize' is an override for broker-specific setup.

```C++
// Initializes the abstract broker
void init_broker();

// Launches the abstract broker execution
void launch(execution_unit *eu, bool lazy, bool hide);

// Override for broker initialization
void initialize();
```

--------------------------------

### WebSocket Server Start

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1net_1_1web__socket_1_1server__factory

Starts a WebSocket server that accepts incoming connections.

```APIDOC
## POST /websites/actor-framework/start

### Description
Starts a server that accepts incoming connections with the WebSocket protocol.

### Method
POST

### Endpoint
/websites/actor-framework/start

### Parameters
#### Query Parameters
- **on_start** (OnStart) - Required - Callback function to execute after the server starts.

### Request Example
```json
{
  "on_start": "your_start_callback_function"
}
```

### Response
#### Success Response (200)
- **disposable** (expected< disposable >) - An object that can be used to stop the server.

#### Response Example
```json
{
  "disposable": "<details_of_disposable_object>"
}
```
```

--------------------------------

### Scheduler Coordinator Start Method

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1scheduler_1_1coordinator-members

Documentation for the 'start()' override method in caf::scheduler::coordinator.

```APIDOC
## Method: start()

### Description
Starts the scheduler coordinator. This method overrides the base class virtual function.

### Method
`void start() override`

### Defined In
`caf::scheduler::coordinator< Policy >`

### Access
Protected

### Example
```cpp
// This method is typically called internally by the framework.
// Direct calls might not be intended for external use.
```
```

--------------------------------

### CAF Main Setup (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.0/dining_philosophers_8cpp-example

Initializes the CAF actor system and sets up the Dining Philosophers simulation. It creates five chopstick actors and five philosopher actors, assigning them specific chopsticks. This function serves as the entry point for the CAF application.

```cpp
void caf_main(actor_system& system) {
scoped_actor self{system};

// create five chopsticks
aout(self) << "chopstick ids are:";
std::vector<chopstick> chopsticks;
for (size_t i = 0; i < 5; ++i) {
chopsticks.push_back(self->spawn(available_chopstick));
aout(self) << " " << chopsticks.back()->id();
}
aout(self) << endl;

// spawn five philosophers
std::vector<std::string> names{"Plato", "Hume", "Kant", "Nietzsche",
"Descartes"};

for (size_t i = 0; i < 5)
self->spawn<philosopher>(names[i], chopsticks[i], chopsticks[(i + 1) % 5]);
}

CAF_MAIN(id_block::dining_philosophers)
caf::actor_config
Stores spawn-time flags and groups.
**Definition:** actor_config.hpp:19
caf::actor_system
Actor environment including scheduler, registry, and optional components such as a middleman.
**Definition:** actor_system.hpp:90
caf::behavior
Describes the behavior of an actor, i.e., provides a message handler and an optional timeout.
**Definition:** behavior.hpp:25
caf::event_based_actor
A cooperatively scheduled, event-based actor implementation.
**Definition:** event_based_actor.hpp:40
caf::intrusive_ptr< actor_control_block >
caf::result
Wraps the result of a message handler to represent either a value (wrapped into a message),...
**Definition:** fwd.hpp:61
caf::scoped_actor
A scoped handle to a blocking actor.
**Definition:** scoped_actor.hpp:18
caf::typed_actor
Identifies a statically typed actor.
**Definition:** typed_actor.hpp:32
caf
Root namespace of libcaf.
**Definition:** abstract_actor.hpp:29
caf::aout
CAF_CORE_EXPORT actor_ostream aout(local_actor *self)
Convenience factory function for creating an actor output stream.

```

--------------------------------

### Start Profiled Coordinator Threads - C++

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1scheduler_1_1profiled__coordinator

The `start` method is responsible for initiating any background threads required by the profiled coordinator module. This method overrides the `start` method from the `coordinator<Policy>` base class.

```cpp
template<class Policy = policy::profiled<policy::work_stealing>>
void caf::scheduler::profiled_coordinator< Policy >::start()
```

--------------------------------

### Actor Lifecycle and Setup

Source: https://www.actor-framework.org/static/doxygen/1.0.0/classcaf_1_1local__actor

Functions related to the setup, cleanup, and launching of actors.

```APIDOC
## Actor Lifecycle and Setup

### Description
Functions for initializing, cleaning up, and launching actors within the framework.

### Methods

- **local_actor(actor_config &cfg)**
  - Description: Initializes a local actor with the provided configuration.
  - Method: Constructor
  - Endpoint: N/A

- **on_cleanup(const error &)**
  - Description: Called from `cleanup` to perform extra cleanup actions for this actor. Can be overridden.
  - Method: Virtual Override
  - Endpoint: N/A

- **setup_metrics()**
  - Description: Sets up metrics for the actor.
  - Method: Member Function
  - Endpoint: N/A

- **launch(scheduler *sched, bool lazy, bool hide)**
  - Description: Launches the actor with the given scheduler and options.
  - Method: Pure Virtual Function
  - Endpoint: N/A

- **on_exit()**
  - Description: Can be overridden to perform cleanup code after an actor finished execution.
  - Method: Virtual Override
  - Endpoint: N/A
```

--------------------------------

### Hello World Example in CAF 0.15 (C++)

Source: https://www.actor-framework.org/blog/2016-05/a-glimpse-at-the-future-of-caf

Demonstrates the 'Hello World' actor example using CAF version 0.15. It showcases the new `actor_system` and simplified actor management. This example requires the CAF library.

```cpp
behavior mirror(event_based_actor* self) {
  // return the (initial) actor behavior
  return {
    // a handler for messages containing a single string
    // that replies with a string
    [=](const string& what) -> string {
      // prints "Hello World!" via aout (thread-safe cout wrapper)
      aout(self) << what << endl;
      // reply "!dlroW olleH"
      return string(what.rbegin(), what.rend());
    }
  };
}

void hello_world(event_based_actor* self, const actor& buddy) {
  // send "Hello World!" to our buddy ...
  self->request(buddy, std::chrono::seconds(10), "Hello World!").then(
    // ... wait up to 10s for a response ...
    [=](const string& what) {
      // ... and print it
      aout(self) << what << endl;
    }
  );
}

int main() {
  // our CAF environment
  actor_system system;
  // create a new actor that calls 'mirror()'
  auto mirror_actor = system.spawn(mirror);
  // create another actor that calls 'hello_world(mirror_actor)';
  system.spawn(hello_world, mirror_actor);
  // system will wait until both actors are destroyed before leaving main
}

```

--------------------------------

### Hello World Example in C++

Source: https://www.actor-framework.org/static/doxygen/0.19.3/index

A basic 'Hello World' example demonstrating the core concepts of the C++ Actor Framework. It shows how to define actor behaviors, spawn actors, send messages, and handle responses. This example uses `actor_system` for managing actors and `event_based_actor` for defining actor logic.

```C++
#include "caf/actor_ostream.hpp"
#include "caf/actor_system.hpp"
#include "caf/caf_main.hpp"
#include "caf/event_based_actor.hpp"
#include <iostream>
#include <string>
using namespace caf;
behavior mirror(event_based_actor* self) {
// return the (initial) actor behavior
return {
// a handler for messages containing a single string
// that replies with a string
[=](const std::string& what) -> std::string {
// prints "Hello World!" via aout (thread-safe cout wrapper)
aout(self) << what << std::endl;
// reply "!dlroW olleH"
return std::string{what.rbegin(), what.rend()};
},
};
}
void hello_world(event_based_actor* self, const actor& buddy) {
// send "Hello World!" to our buddy ...
self->request(buddy, std::chrono::seconds(10), "Hello World!")
.then(
// ... wait up to 10s for a response ...
[=](const std::string& what) {
// ... and print it
aout(self) << what << std::endl;
});
}
void caf_main(actor_system& sys) {
// create a new actor that calls 'mirror()'
auto mirror_actor = sys.spawn(mirror);
// create another actor that calls 'hello_world(mirror_actor)';
sys.spawn(hello_world, mirror_actor);
// the system will wait until both actors are done before exiting the program
}
// creates a main function for us that calls our caf_main
CAF_MAIN()
```

--------------------------------

### Starting an HTTP Server in C++

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1net_1_1http_1_1server__factory

Illustrates how to start an HTTP server in C++ using the CAF framework. It covers starting a server that only serves pre-defined routes and a server that can also handle requests without a fixed route, making it available to an observer. The `start` function returns an `expected<disposable>`.

```cpp
// Start a server that only serves fixed routes
// expected<disposable> disp = server.start();

// Start a server that makes HTTP requests without a fixed route available to an observer
// template<class OnStart>
// expected<disposable> start(OnStart on_start);
// server.start([](auto& server_instance) { /* callback actions */ });

```

--------------------------------

### Module Lifecycle: Start and Init in Abstract Coordinator

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1scheduler_1_1abstract__coordinator

Shows the overridden 'start()' and 'init()' functions. 'start()' initializes any background threads, and 'init()' allows modification of the actor system's configuration during startup. These are essential for module lifecycle management.

```cpp
void | start () override
| Starts any background threads needed by the module.

void | init (actor_system_config &cfg) override
| Allows the module to change the configuration of the actor system during startup.
```

--------------------------------

### start

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1io_1_1network_1_1stream__impl

Starts reading data from the socket and forwards incoming data to the provided stream manager.

```APIDOC
## start

### Description
Initiates the process of reading data from the associated socket. Incoming data will be forwarded to the specified `stream_manager`.

### Method
`void`

### Endpoint
N/A (Member Function)

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```json
{
  "example": "stream_manager *mgr"
}
```

### Response
#### Success Response (200)
None (This is a void function).

#### Response Example
N/A
```

--------------------------------

### start()

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1io_1_1middleman

Starts any background threads needed by the IO middleman module.

```APIDOC
## POST /websites/actor-framework/start

### Description
Starts any background threads needed by the module.
Implements caf::actor_system::module.

### Method
POST

### Endpoint
/websites/actor-framework/start

### Response
#### Success Response (200)
- **status** (string) - Indicates that the middleman has started.

#### Response Example
```json
{
  "status": "started"
}
```
```

--------------------------------

### Hello World Example in CAF 0.14 (C++)

Source: https://www.actor-framework.org/blog/2016-05/a-glimpse-at-the-future-of-caf

Illustrates the 'Hello World' actor example using CAF version 0.14. This version uses a singleton-based design and requires explicit calls to `await_all_actors_done()` and `shutdown()`. This example requires the CAF library.

```cpp
behavior mirror(event_based_actor* self) {
  // return the (initial) actor behavior
  return {
    // a handler for messages containing a single string
    // that replies with a string
    [=](const string& what) -> string {
      // prints "Hello World!" via aout (thread-safe cout wrapper)
      aout(self) << what << endl;
      // terminates this actor ('become' otherwise loops forever)
      self->quit();
      // reply "!dlroW olleH"
      return string(what.rbegin(), what.rend());
    }
  };
}

void hello_world(event_based_actor* self, const actor& buddy) {
  // send "Hello World!" to our buddy ...
  self->sync_send(buddy, "Hello World!").then(
    // ... wait for a response ...
    [=](const string& what) {
      // ... and print it
      aout(self) << what << endl;
    }
  );
}

int main() {
  // create a new actor that calls 'mirror()'
  auto mirror_actor = spawn(mirror);
  // create another actor that calls 'hello_world(mirror_actor)';
  spawn(hello_world, mirror_actor);
  // wait until all other actors we have spawned are done
  await_all_actors_done();
  // run cleanup code before exiting main
  shutdown();
}

```

--------------------------------

### Profiled Coordinator Start

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1scheduler_1_1profiled__coordinator

Starts any necessary background threads for the profiled coordinator. This is an override from the base coordinator class.

```APIDOC
## void start()

### Description
Starts any background threads needed by the module. Reimplemented from caf::scheduler::coordinator< Policy >.

### Method
`void`

### Endpoint
N/A (Class Method)

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```
// Example usage after initialization
```

### Response
#### Success Response (N/A)
This method does not return a value.

#### Response Example
N/A
```

--------------------------------

### Hello World Example in C++ Actor Framework

Source: https://www.actor-framework.org/static/doxygen/0.19.1/index

Demonstrates a basic 'Hello World' example using the C++ Actor Framework. It includes setting up an actor system, defining actor behaviors, and spawning actors to communicate. This example requires the CAF library. It takes a string as input and returns its reversed version, illustrating message handling and replies.

```C++
#include <iostream>
#include <string>
#include "caf/actor_ostream.hpp"
#include "caf/actor_system.hpp"
#include "caf/caf_main.hpp"
#include "caf/event_based_actor.hpp"
using namespace caf;
behavior mirror(event_based_actor* self) {
// return the (initial) actor behavior
return {
// a handler for messages containing a single string
// that replies with a string
[=](const std::string& what) -> std::string {
// prints "Hello World!" via aout (thread-safe cout wrapper)
aout(self) << what << std::endl;
// reply "!dlroW olleH"
return std::string{what.rbegin(), what.rend()};
},
};
}
void hello_world(event_based_actor* self, const actor& buddy) {
// send "Hello World!" to our buddy ...
self->request(buddy, std::chrono::seconds(10), "Hello World!")
.then(
// ... wait up to 10s for a response ...
[=](const std::string& what) {
// ... and print it
aout(self) << what << std::endl;
});
}
void caf_main(actor_system& sys) {
// create a new actor that calls 'mirror()'
auto mirror_actor = sys.spawn(mirror);
// create another actor that calls 'hello_world(mirror_actor)';
sys.spawn(hello_world, mirror_actor);
// the system will wait until both actors are done before exiting the program
}
// creates a main function for us that calls our caf_main
CAF_MAIN()

```

--------------------------------

### Class Member Documentation

Source: https://www.actor-framework.org/static/doxygen/0.19.3/functions_g

This section provides details on documented class members, categorized by their starting letter. It includes functions like 'gauge_family', 'get', and 'graceful_shutdown'.

```APIDOC
## Class Members Documentation

### Description
This section lists documented class members, with a focus on members starting with the letter 'g'. It includes functions related to metrics, retrieval of actor information, and network operations.

### Method
N/A (Documentation Reference)

### Endpoint
N/A

### Parameters
N/A

### Request Example
N/A

### Response
#### Success Response (200)
- **Member Name** (string) - The name of the class member.
- **Class** (string) - The class to which the member belongs.

#### Response Example
```json
{
  "member_name": "gauge_family",
  "class": "caf::telemetry::metric_registry"
}
```

```json
{
  "member_name": "get",
  "class": "caf::actor_control_block, caf::actor_registry, ..."
}
```

```json
{
  "member_name": "graceful_shutdown",
  "class": "caf::io::network::acceptor, caf::io::network::event_handler, ..."
}
```
```

--------------------------------

### Initialize WebSocket Framing Layer (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1net_1_1web__socket_1_1framing

The `start()` method initializes the upper layer of the WebSocket framing. It requires a pointer to the lower layer, which must remain valid for the lifetime of the upper layer.

```cpp
void caf::net::web_socket::framing::start(
  octet_stream::lower_layer* down_
) override;

// Implements caf::net::octet_stream::upper_layer.
```

--------------------------------

### start() - Initialize Upper Layer

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1net_1_1http_1_1router

Initializes the upper layer. This method is called during the setup of the HTTP communication.

```APIDOC
## POST /websites/actor-framework/start

### Description
Initializes the upper layer. This method is called during the setup of the HTTP communication.

### Method
POST

### Endpoint
/websites/actor-framework/start

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **lower_layer** (lower_layer*) - Required - A pointer to the lower layer that remains valid for the lifetime of the upper layer.

### Request Example
```json
{
  "lower_layer": "0x..."
}
```

### Response
#### Success Response (200)
- **status** (error) - Indicates the success or failure of the initialization.

#### Response Example
```json
{
  "status": "success"
}
```
```

--------------------------------

### Ccaf::net::dsl::server_config

Source: https://www.actor-framework.org/static/doxygen/0.19.0/hierarchy

Wraps configuration parameters for starting servers.

```APIDOC
## Ccaf::net::dsl::server_config

### Description
Wraps configuration parameters for starting clients.

### Method
N/A (Class Definition)

### Endpoint
N/A

### Parameters
N/A

### Request Example
N/A

### Response
N/A

```

--------------------------------

### Get This Actor Handle in BASP

Source: https://www.actor-framework.org/static/doxygen/0.18.7/classcaf_1_1io_1_1basp__broker

Returns a handle to the current actor instance (the callee). This allows the actor to refer to itself, for example, when sending messages.

```cpp
strong_actor_ptr this_actor () override
| Returns a handle to the callee actor.
```

--------------------------------

### Get Internal Actor for Runtime Configuration

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1actor__system

Retrieves a constant reference to the internal actor responsible for managing and storing the runtime configuration of the actor system. This is crucial for system setup and modification.

```cpp
const strong_actor_ptr & config_serv () const;

```

--------------------------------

### start() - Web Socket Server

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1net_1_1web__socket_1_1server

Initializes the upper layer of the web socket server.

```APIDOC
## error start(octet_stream::lower_layer *down)

### Description
Initializes the upper layer of the web socket server.

### Method
POST

### Endpoint
/websites/actor-framework/start

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **lower_layer_ptr** (pointer) - Required - A pointer to the lower layer that remains valid for the lifetime of the upper layer.

### Request Example
```json
{
  "lower_layer_ptr": "0x7ffc12345678"
}
```

### Response
#### Success Response (200)
- **error_code** (integer) - The error code indicating the result of the initialization. 0 for success.

#### Response Example
```json
{
  "error_code": 0
}
```
```

--------------------------------

### Generic Configuration Class (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.1/namespacecaf_1_1net_1_1dsl

Wraps configuration for base parameters before determining if a client or server is being started. This class is useful for initial setup common to both.

```cpp
class generic_config {
  // ... members for generic configuration
};

```

--------------------------------

### Accessing caf::save_inspector Members in C++

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1save__inspector-members

This snippet demonstrates how to interact with members of the `caf::save_inspector` class. It includes examples of setting and getting errors, as well as defining fields for serialization or inspection.

```cpp
// Example of setting an error
caf::save_inspector inspector;
inspector.set_error(caf::make_error(caf::sec::runtime_error, "A custom error occurred."));

// Example of getting the current error
auto err = inspector.get_error();

// Example of defining a field with a name and a reference
int my_value;
inspector.field("my_field", my_value);

// Example of defining a field with a name, getter, and setter
inspector.field("another_field", []{ return 42; }, [](int val){ /* handle set */ });

// Example of defining a field with presence check, getter, and setter
inspector.field("optional_field", []{ return true; }, []{ return "optional_value"; }, [](std::string val){ /* handle set */ });
```

--------------------------------

### Ccaf::net::dsl::client_config

Source: https://www.actor-framework.org/static/doxygen/0.19.0/hierarchy

Wraps configuration parameters for starting clients.

```APIDOC
## Ccaf::net::dsl::client_config

### Description
Wraps configuration parameters for starting clients.

### Method
N/A (Class Definition)

### Endpoint
N/A

### Parameters
N/A

### Request Example
N/A

### Response
N/A

```

--------------------------------

### Field Type Suffix for JSON Writer

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1json__writer

Returns a suffix used for generating type annotation fields, particularly for variant types in JSON. For example, a field named 'foo' might get an annotation field like '@foo${field_type_suffix}'.

```c++
std::string_view caf::json_writer::field_type_suffix() const noexcept
```

--------------------------------

### Get JSON Field Type Suffix (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1json__builder

The `field_type_suffix` function returns a string view representing the suffix used for generating type annotation fields for variant fields in JSON. For example, it might append `${field_type_suffix}` to a field name.

```c++
std::string_view caf::json_builder::field_type_suffix() const noexcept
```

--------------------------------

### HTTP Server Factory and Routing in C++

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1net_1_1http_1_1server__factory

Demonstrates how to create and configure an HTTP server using the CAF framework. It shows how to define routes with different HTTP methods and actions, and how to start the server. This factory pattern allows for a fluent DSL for server setup.

```cpp
#include <caf/net/http/server_factory.hpp>
#include <caf/net/dsl.hpp>

// Assuming server_config and server_factory are defined elsewhere
// using namespace caf;
// using namespace caf::net;

// Example usage:
// auto server = http::server_factory_base<server_config, server_factory>();
// server.route("/", [](auto req) { return make_message(http::status::ok, "Hello, World!"); });
// server.route("/api", http::method::get, [](auto req) { /* handle GET request */ });
// server.start();

```

--------------------------------

### WebSocket Framing: start()

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1net_1_1web__socket_1_1framing

Initializes the upper layer of the web socket framing.

```APIDOC
## POST /websites/actor-framework/framing/start

### Description
Initializes the upper layer of the web socket framing.

### Method
POST

### Endpoint
`/websites/actor-framework/framing/start`

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
* **down** (octet_stream::lower_layer *) - Required - A pointer to the lower layer that remains valid for the lifetime of the upper layer.

### Request Example
```json
{
  "down": "pointer_to_lower_layer"
}
```

### Response
#### Success Response (200)
* **error** (error) - An error code indicating the result of the initialization.

#### Response Example
```json
{
  "error": "error_code_or_default"
}
```
```

--------------------------------

### Ccaf::net::dsl::has_context< Base, Subtype >

Source: https://www.actor-framework.org/static/doxygen/0.19.0/hierarchy

DSL entry point for creating a server.

```APIDOC
## Ccaf::net::dsl::has_context< Base, Subtype >

### Description
DSL entry point for creating a server.

### Method
N/A (Class Definition)

### Endpoint
N/A

### Parameters
N/A

### Request Example
N/A

### Response
N/A

```

--------------------------------

### Get Field Type Suffix - C++

Source: https://www.actor-framework.org/static/doxygen/0.18.7/classcaf_1_1json__writer

Retrieves the suffix used for generating type annotation fields for variant fields. CAF uses this suffix to append to field names for type information, for example, '@foo${field_type_suffix}' for a variant field named 'foo'. This method is `noexcept`.

```cpp
string_view caf::json_writer::field_type_suffix() const noexcept
```

--------------------------------

### Get or Deduction Guide for caf::config_value

Source: https://www.actor-framework.org/static/doxygen/0.19.0/structcaf_1_1get__or__deduction__guide

Provides a customization point for mapping default value types to deduced types within the caf::config_value structure. It ensures correct type deduction, for instance, returning a string instead of a string_view. User-defined overloads should not specialize this for types in the 'std' or 'caf' namespaces.

```cpp
#include <config_value.hpp>

template<class T>
struct caf::get_or_deduction_guide< T >
```

```cpp
template<class V >
static decltype(auto) convert(V &&x)
```

--------------------------------

### start()

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1net_1_1web__socket_1_1client

Initializes the upper layer of the web socket client, requiring a pointer to the lower layer.

```APIDOC
## POST /websites/actor-framework/start

### Description
Initializes the upper layer of the web socket client. Implements `caf::net::octet_stream::upper_layer`.

### Method
POST

### Endpoint
/websites/actor-framework/start

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
- **_down_** (octet_stream::lower_layer*) - Required - A pointer to the lower layer that remains valid for the lifetime of the upper layer.

### Request Example
```json
{
  "_down_": "<pointer address or identifier>"
}
```

### Response
#### Success Response (200)
- **status** (error) - Indicates the result of the initialization. Success is typically represented by an error code of 0.

#### Response Example
```json
{
  "status": 0
}
```
```

--------------------------------

### Get Last N Elements of a Type List in C++

Source: https://www.actor-framework.org/static/doxygen/0.18.7/structcaf_1_1detail_1_1tl__right

This C++ struct, `tl_right`, creates a new type list containing the last N elements from an existing list. It relies on template metaprogramming and the `tl_slice_t` and `tl_size` types from the CAF library. The `first_idx` static member calculates the starting index for slicing.

```cpp
#include <type_list.hpp>

template<class List, size_t NewSize, size_t OldSize = tl_size<List>::value>
struct caf::detail::tl_right< List, NewSize, OldSize > {
  using type = tl_slice_t< List, first_idx, OldSize >;
  static constexpr size_t first_idx = OldSize > NewSize ? OldSize - NewSize : 0;
};
```

--------------------------------

### CAF Actor System Module Interface (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1actor__system_1_1module-members

Defines the interface for a module within the CAF actor system. It includes pure virtual functions for initialization, starting, stopping, and obtaining a subtype pointer, along with methods to get the module's ID and name. This interface is fundamental for extending the actor system with custom modules.

```cpp
namespace caf {
namespace actor_system {

class module {
public:
  using id_t = uint16_t;

  virtual ~module() = default;

  virtual id_t id() const = 0;
  virtual char const* name() const noexcept = 0;
  virtual void init(actor_system_config& cfg) = 0;
  virtual void start() = 0;
  virtual void stop() = 0;
  virtual std::unique_ptr<module> subtype_ptr() = 0;

  // Enum values for common module identifiers
  enum {
    middleman,
    scheduler,
    network_manager,
    openssl_manager,
    num_ids
  };
};

} // namespace actor_system
} // namespace caf
```

--------------------------------

### Metrics Setup

Source: https://www.actor-framework.org/static/doxygen/1.0.0/classcaf_1_1abstract__blocking__actor

Function for setting up actor metrics.

```APIDOC
## Metrics Setup

### Description
Initializes metrics collection for the actor.

### Method

- **setup_metrics** ()
  - Description: Sets up metrics for the actor.
```

--------------------------------

### Middleman Start API

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1net_1_1middleman

Starts any background threads required by the middleman module.

```APIDOC
## POST /websites/actor-framework/middleman/start

### Description
Starts any background threads needed by the module.

### Method
POST

### Endpoint
/websites/actor-framework/middleman/start

### Parameters
None

### Request Example
None

### Response
#### Success Response (200)
- **status** (string) - Indicates that the middleman has started.

#### Response Example
```json
{
  "status": "started"
}
```
```

--------------------------------

### Initialize HTTP Router - C++

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1net_1_1http_1_1router

The start function initializes the HTTP router's upper layer. It requires a pointer to the lower layer, which is guaranteed to remain valid throughout the upper layer's lifetime. Implements caf::net::http::upper_layer.

```cpp
error caf::net::http::router::start(lower_layer* _down_)
```

--------------------------------

### Starting and Activating an Acceptor in C++

Source: https://www.actor-framework.org/static/doxygen/0.19.3/classcaf_1_1io_1_1network_1_1acceptor

Demonstrates how to start and activate an acceptor using a provided 'acceptor_manager'. The 'start' function initializes the acceptor, and 'activate' prepares it for operation.

```cpp
#include <acceptor.hpp>

// Starts this acceptor, forwarding all incoming connections to `manager`.
void start(acceptor_manager *mgr);

// Activates the acceptor.
void activate(acceptor_manager *mgr);
```

--------------------------------

### Server Configuration API

Source: https://www.actor-framework.org/static/doxygen/1.0.0/classcaf_1_1net_1_1dsl_1_1server__config

This section details the configuration parameters for starting clients using the server configuration.

```APIDOC
## Detailed Description
Wraps configuration parameters for starting clients.
* * *
The documentation for this class was generated from the following file:
  * libcaf_net/caf/net/dsl/server_config.hpp
```

```APIDOC
## Classes
---
class | lazy
| Configuration for a server that creates the socket on demand. More...

class | socket
| Configuration for a server that uses a user-provided socket. More...
```

```APIDOC
## Public Types
---
using | **lazy_t** = server_config_tag<lazy>
using | **socket_t** = server_config_tag<error>
using | **fail_t** = server_config_tag<error>
```

```APIDOC
## Static Public Attributes
---
static constexpr auto | **lazy_v** = lazy_t{}
static constexpr auto | **socket_v** = socket_t{}
static constexpr auto | **fail_v** = fail_t{}
```

--------------------------------

### Generic Configuration and DSL Entries

Source: https://www.actor-framework.org/static/doxygen/0.19.1/namespaces

Generic configuration wrappers and DSL entry points for creating clients and servers.

```APIDOC
## Generic Configuration and DSL Entries

### Description
Utilities for general configuration and specific DSL entry points for network connection setup.

### Components

- **Cgeneric_config**
  - Description: Wraps configuration of some base parameters before we know whether the user is starting a client or a server.
- **Clazy**
  - Description: Configuration for a client that creates the socket on demand.
- **Cgeneric_config_tag**
  - Description: Meta programming utility.
- **Cget_name**
  - Description: Meta programming utility for accessing the name of a type.
- **Chas_accept**
  - Description: DSL entry point for creating a server.
- **Chas_connect**
  - Description: DSL entry point for creating a client.
- **Chas_context**
  - Description: DSL entry point for creating a server.
- **Chas_ctx**
  - Description: Configuration for a client that uses a user-provided socket.
- **Chas_uri_connect**
  - Description: DSL entry point for creating a client from an URI.
- **Cserver_address**
  - Description: Simple type for storing host and port information for reaching a server.
```

--------------------------------

### Start Actor System Module (C++)

Source: https://www.actor-framework.org/static/doxygen/1.0.0/classcaf_1_1actor__system_1_1networking__module-members

Declares the pure virtual function `start` within the `caf::actor_system_module` class. This function is responsible for starting the module's operations.

```c++
start() = 0;
```

--------------------------------

### Minimal Actor Framework Application Setup (C++)

Source: https://www.actor-framework.org/blog/2015-08/testing-brokers

This C++ code snippet demonstrates a minimal application setup using the Actor Framework's brokers. It includes functions to spawn an IO server on a specific port, wait for all actors to complete, and shut down the system.

```C++
int main() {
  spawn_io_server(server, 8080);
  await_all_actors_done();
  shutdown();
}
```

--------------------------------

### accept_handler::start

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1detail_1_1accept__handler

Starts processing on this layer. Implements caf::net::socket_event_layer.

```APIDOC
## error start(net::socket_manager * _owner_)

### Description
Starts processing on this layer. Implements caf::net::socket_event_layer.

### Method
error

### Endpoint
N/A (Method within a class)

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
```json
{
  "_owner_": {"type": "net::socket_manager *"} // Placeholder for socket manager pointer
}
```

### Response
#### Success Response (200)
- **error_code** (error) - An error code indicating success or failure.

#### Response Example
```json
{
  "error_code": 0 // Example success error code
}
```
```

--------------------------------

### C++ Actor Framework: Deduction Guide for Configuration Values

Source: https://www.actor-framework.org/static/doxygen/0.18.7/structcaf_1_1get__or__deduction__guide

This C++ code defines a customization point for configuring automatic mappings from default value types to deduced types within the C++ Actor Framework. It is used to ensure correct type handling, for example, returning a string instead of a string_view. User-defined overloads must adhere to specific namespace restrictions.

```cpp
#include <config_value.hpp>

template<class T>
struct caf::get_or_deduction_guide< T > {
  using value_type = T;

  template<class V>
  static decltype(auto) convert(V &&x);
};

/*
  Customization point for configuring automatic mappings from default value types to deduced types.
  For example, `get_or(value, "foo"sv)` must return a `string` rather than a `string_view`.
  However, user-defined overloads _must not_ specialize this class for any type from the namespaces `std` or `caf`.
*/

```

--------------------------------

### HTTP Configuration DSL Entry Points (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.0/namespacecaf_1_1net_1_1http

Defines the `with` functions that serve as entry points for the HTTP configuration DSL. These functions are overloaded to accept either an actor system or a multiplexer.

```C++
with_t | **with** (actor_system &sys)
with_t | **with** (multiplexer *mpx)
```

--------------------------------

### Get or Modify caf::message Elements

Source: https://www.actor-framework.org/static/doxygen/1.0.0/classcaf_1_1message-members

Functions to access or modify elements within a `caf::message` by index. Provides methods to get elements as a specific type and to get mutable references.

```cpp
get_as(size_t index) const noexcept;
get_mutable_as(size_t index) noexcept;
```

--------------------------------

### C++ Actor Framework 'Hello World' Example

Source: https://www.actor-framework.org/static/doxygen/1.0.0/index

Demonstrates a basic 'Hello World' application using the C++ Actor Framework (CAF). It defines an actor behavior ('mirror') that echoes a string in reverse and a function ('hello_world') to send a message and receive a reply. The main function sets up the actor system and spawns these actors. Dependencies include CAF headers like 'actor_ostream.hpp', 'actor_system.hpp', 'caf_main.hpp', and 'event_based_actor.hpp'.

```C++
#include "caf/actor_ostream.hpp"
#include "caf/actor_system.hpp"
#include "caf/caf_main.hpp"
#include "caf/event_based_actor.hpp"
#include <string>

using namespace caf;
using namespace std::literals;

behavior mirror(event_based_actor* self) {
  // return the (initial) actor behavior
  return {
    // a handler for messages containing a single string
    // that replies with a string
    [self](const std::string& what) -> std::string {
      // prints "Hello World!" (thread-safe)
      self->println("{}", what);
      // reply "!dlroW olleH"
      return std::string{what.rbegin(), what.rend()};
    },
  };
}

void hello_world(event_based_actor* self, const actor& buddy) {
  // send "Hello World!" to our buddy ...
  self->mail("Hello World!")
    .request(buddy, 10s)
    .then(
      // ... wait up to 10s for a response ...
      [self](const std::string& what) {
        // ... and print it
        self->println("{}", what);
      });
}

void caf_main(actor_system& sys) {
  // create a new actor that calls 'mirror()'
  auto mirror_actor = sys.spawn(mirror);
  // create another actor that calls 'hello_world(mirror_actor)';
  sys.spawn(hello_world, mirror_actor);
  // the system will wait until both actors are done before exiting the program
}

// creates a main function for us that calls our caf_main
CAF_MAIN()
```

--------------------------------

### Initialize Profiled Coordinator Configuration - C++

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1scheduler_1_1profiled__coordinator

The `init` method allows modification of the actor system's configuration during the startup phase. It is an override from the `abstract_coordinator` class and takes an `actor_system_config` object as input.

```cpp
template<class Policy = policy::profiled<policy::work_stealing>>
void caf::scheduler::profiled_coordinator< Policy >::init(actor_system_config & cfg)
```

--------------------------------

### Configuration and Customization

Source: https://www.actor-framework.org/static/doxygen/0.19.1/namespaces

Utilities for configuration, deduction guides, and customization points.

```APIDOC
## Configuration and Customization

### Description
This section covers utilities and customization points for configuring actor behavior, message handling, and type deductions.

### Endpoints

#### `Cget_or_auto_deduce`

##### Description
Configures `get_or` to use the `get_or_deduction_guide`.

##### Method
N/A (Configuration Utility)

##### Endpoint
N/A

#### `Cget_or_deduction_guide`

##### Description
Customization point for configuring automatic mappings from default value types to deduced types.

##### Method
N/A (Customization Point)

#### `Cis_error_code_enum`

##### Description
Customization point for enabling conversion from an enum type to an error or `error_code`.

##### Method
N/A (Customization Point)

##### Endpoint
N/A

#### `Cis_variant_wrapper`

##### Description
Customization point for variant wrappers.

##### Method
N/A (Customization Point)

##### Endpoint
N/A

#### `Cinspector_access`

##### Description
Customization point for adding support for a custom type to the inspection API.

##### Method
N/A (Customization Point)

##### Endpoint
N/A

#### `Cgroup_module`

##### Description
Interface for user-defined multicast implementations.

##### Method
N/A (Interface Definition)

##### Endpoint
N/A
```

--------------------------------

### Initialize Broker

Source: https://www.actor-framework.org/static/doxygen/0.19.0/classcaf_1_1io_1_1basp__broker

Initializes the broker, performing setup tasks necessary for its operation. This function is typically called once after the broker is created.

```C++
void initialize () override

```

--------------------------------

### Profiled Coordinator Start API

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1scheduler_1_1profiled__coordinator

Starts any background threads needed by the module. This method is an override from caf::scheduler::coordinator.

```APIDOC
## void start()

### Description
Starts any background threads needed by the module. Reimplemented from caf::scheduler::coordinator.

### Method
`void`

### Endpoint
`N/A`

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
None

### Response
#### Success Response (200)
None (void return type)

#### Response Example
None
```

--------------------------------

### start

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1detail_1_1ws__server__flow__bridge

Starts the WebSocket server flow bridge by connecting it to the lower layer.

```APIDOC
## start

### Description
Starts the WebSocket server flow bridge by connecting it to the lower layer.

### Method
`start`

### Endpoint
N/A

### Parameters
#### Path Parameters
None

#### Query Parameters
None

#### Request Body
None

### Request Example
None

### Response
#### Success Response (200)
None

#### Response Example
None
```

--------------------------------

### Server Configuration

Source: https://www.actor-framework.org/static/doxygen/0.19.1/namespaces

Configuration parameters for starting servers, including lazy and socket-based configurations.

```APIDOC
## Server Configuration

### Description
Wrappers and utilities for configuring server setups, allowing for different socket and lazy initialization strategies.

### Components

- **Cserver_config**
  - Description: Wraps configuration parameters for starting clients.
- **Clazy**
  - Description: Configuration for a server that creates the socket on demand.
- **Csocket**
  - Description: Configuration for a server that uses a user-provided socket.
- **Cserver_config_tag**
  - Description: Meta programming utility.
- **Cserver_factory_base**
  - Description: Base type for server factories for use with `can_accept`.
```

--------------------------------

### Initialize Meta Objects

Source: https://www.actor-framework.org/static/doxygen/0.19.0/namespacecaf

Functions for initializing meta objects and loading modules. `exec_main_init_meta_objects_single` and `exec_main_init_meta_objects` handle meta object initialization, while `exec_main_load_module` loads a specific module.

```C++
template<class T >
void | **exec_main_init_meta_objects_single** ()  
```

```C++
template<class... Ts>
void | **exec_main_init_meta_objects** ()  
```

```C++
template<class T >
void | **exec_main_load_module** (actor_system_config &cfg)  
```

--------------------------------

### DSL Entry Point for Creating a Client (C++)

Source: https://www.actor-framework.org/static/doxygen/0.19.1/namespacecaf_1_1net_1_1dsl

Provides the Domain Specific Language (DSL) entry point for initiating client creation. It's used in conjunction with configuration objects to set up client connections.

```cpp
class has_connect {
  // ... DSL methods for client connection
};

```

--------------------------------

### Start HTTP Server - C++

Source: https://www.actor-framework.org/static/doxygen/0.19.1/classcaf_1_1net_1_1http_1_1server__factory

Starts the HTTP server. This function can be used to start a server that serves only fixed routes or one that makes HTTP requests without a fixed route, responding to an observer. It returns an expected disposable object.

```cpp
expected< disposable > start (OnStart on_start)
expected< disposable > start ()
```

--------------------------------

### Initialization and System Management

Source: https://www.actor-framework.org/static/doxygen/0.18.7/namespacecaf

Functions for initializing the actor system and managing meta-objects.

```APIDOC
## Initialization and System Management

### Description
Functions for initializing the actor system and managing meta-objects.

### `exec_main_init_meta_objects()`

#### Description
Initializes meta-objects for the main execution context.

#### Method
`void`

### `exec_main_load_module<T>(actor_system_config &cfg)`

#### Description
Loads a module into the actor system configuration.

#### Method
`template<class T>`
`void`

### `exec_main<F>(F fun, int argc, char **argv)`

#### Description
Executes the main function of the actor system.

#### Method
`template<class... Ts, class F = void (*)(actor_system&)>`
`int`

### `init_global_meta_objects_impl<ProjectIds, uint16_t... Is>(std::integer_sequence< uint16_t, Is... >)`

#### Description
Implementation helper for initializing global meta objects.

#### Method
`template<class ProjectIds , uint16_t... Is>`
`void`

### `init_global_meta_objects<ProjectIds>()`

#### Description
Initializes the global meta object table with all types in `ProjectIds`.

#### Method
`template<class ProjectIds>`
`void`
```

--------------------------------

### Dining Philosophers Example in C++ using CAF

Source: https://www.actor-framework.org/static/doxygen/0.19.0/dining_philosophers_8cpp-example

An event-based implementation of the classical Dining Philosophers exercise using CAF's actor model. This example demonstrates actor communication, state management, and atom message passing.

```cpp
#include <chrono>
#include <iostream>
#include <map>
#include <sstream>
#include <thread>
#include <utility>
#include <vector>
#include "caf/all.hpp"

CAF_BEGIN_TYPE_ID_BLOCK(dining_philosophers, first_custom_type_id)
  CAF_ADD_ATOM(dining_philosophers, take_atom)
  CAF_ADD_ATOM(dining_philosophers, taken_atom)
  CAF_ADD_ATOM(dining_philosophers, eat_atom)
  CAF_ADD_ATOM(dining_philosophers, think_atom)
CAF_END_TYPE_ID_BLOCK(dining_philosophers)

using std::cerr;
using std::cout;
using std::endl;
using std::chrono::seconds;
using namespace caf;

namespace {

// atoms for chopstick and philosopher interfaces

// a chopstick
using chopstick
  = typed_actor<result<taken_atom, bool>(take_atom), result<void>(put_atom)>;

chopstick::behavior_type taken_chopstick(chopstick::pointer, const strong_actor_ptr&);

// either taken by a philosopher or available
chopstick::behavior_type available_chopstick(chopstick::pointer self) {
  return {
    [=](take_atom) -> result<taken_atom, bool> {
      self->become(taken_chopstick(self, self->current_sender()));
      return {taken_atom_v, true};
    },
    [](put_atom) { cerr << "chopstick received unexpected 'put'" << endl; },
  };
}

chopstick::behavior_type taken_chopstick(chopstick::pointer self,
                                        const strong_actor_ptr& user) {
  return {
    [](take_atom) -> result<taken_atom, bool> {
      return {taken_atom_v, false};
    },
    [=](put_atom) {
      if (self->current_sender() == user)
        self->become(available_chopstick(self));
    },
  };
}

// Based on: http://www.dalnefre.com/wp/2010/08/dining-philosophers-in-humus/
//
//
// +-------------+ {busy|taken}
// +-------->| thinking |<------------------+
// | +-------------+ |
// | | |
// | | {eat} |
// | | |
// | V |
// | +-------------+ {busy} +-------------+
// | | hungry |----------->| denied |
// | +-------------+ +-------------+
// | |
// | | {taken}
// | |
// | V
// | +-------------+ 
// | | granted |
// | +-------------+
// | | |
// | {busy} | | {taken}
// +-----------+ |
// | V
// | {think} +-------------+
// +---------| eating |
// +-------------+
class philosopher : public event_based_actor {
 public:
  philosopher(actor_config& cfg, std::string n, chopstick l, chopstick r)
    : event_based_actor(cfg),
      name_(std::move(n)),
      left_(std::move(l)),
      right_(std::move(r)) {
    // we only accept one message per state and skip others in the meantime
    set_default_handler(skip);
    // a philosopher that receives {eat} stops thinking and becomes hungry
    thinking_.assign([=](eat_atom) {
      become(hungry_);
      send(left_, take_atom_v);
      send(right_, take_atom_v);
    });
  }

 private:
  std::string name_;
  chopstick left_;
  chopstick right_;
  // state: thinking
  behavior_type thinking_;
  // state: hungry
  behavior_type hungry_;
  // state: eating
  behavior_type eating_;
  // state: denied
  behavior_type denied_;
};

}

```