### Get Throw Location

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Retrieves the source location associated with an exception. It checks if the exception was thrown using boost::throw_with_location or if it directly contains boost::exception information.

```cpp
template<class E> boost::source_location get_throw_location( E const & e );
```

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

### Basic boost::throw_with_location Usage in C++

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Demonstrates the fundamental use of boost::throw_with_location. When no explicit source location is provided, the macro captures the call site automatically. This requires including boost/throw_exception.hpp and boost/core/verbose_terminate_handler.hpp for exception handling and reporting.

```cpp
#include <boost/throw_exception.hpp>
#include <boost/core/verbose_terminate_handler.hpp>
#include <stdexcept>

int f1( int x )
{
    if( x < 0 )
    {
        boost::throw_with_location(
            std::invalid_argument( "f1: x cannot be negative" ) );
    }

    return x;
}

int main()
{
    std::set_terminate( boost::core::verbose_terminate_handler );

    return f1( -4 );
}

```

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

### Boost throw_exception Overload Synopsis in C++

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Provides the C++ synopsis for the 'boost::throw_exception' function overloads, including those that accept a 'boost::source_location'. This is relevant for projects where exceptions might be disabled or for integrating with the latest Boost library features.

```cpp
#include <boost/assert/source_location.hpp>
#include <boost/config.hpp>
#include <exception>

namespace boost
{

#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e ); // user defined

BOOST_NORETURN void throw_exception( std::exception const & e,
  boost::source_location const & loc ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e );

template<class E> BOOST_NORETURN void throw_exception( E const & e,
  boost::source_location const & loc );

#endif

} // namespace boost

#define BOOST_THROW_EXCEPTION(x) \
  ::boost::throw_exception(x, BOOST_CURRENT_LOCATION)

namespace boost
{

template<class E> BOOST_NORETURN void throw_with_location( E && e,
  boost::source_location const & loc = BOOST_CURRENT_LOCATION );

template<class E> boost::source_location get_throw_location( E const & e );

} // namespace boost

```

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

### Throw Exception with Boost.ThrowException and Source Location

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Demonstrates using `BOOST_THROW_EXCEPTION` to throw a `std::runtime_error` and capture diagnostic information, including the source location. This is useful for unified exception handling and debugging.

```cpp
#include <boost/throw_exception.hpp>
#include <boost/exception/diagnostic_information.hpp>
#include <stdexcept>
#include <iostream>

void f()
{
    BOOST_THROW_EXCEPTION( std::runtime_error( "Unspecified runtime error" ) );
}

int main()
{
    try
    {
        f();
    }
    catch( std::exception const & x )
    {
        std::cerr << boost::diagnostic_information( x ) << std::endl;
    }
}
```

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

### Throw Exception with Boost.ThrowException and Explicit Source Location

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Illustrates using `boost::throw_exception` with an explicit `boost::source_location` passed to a helper function. This allows accurate tracking of the logical throw point, even when the exception is thrown from a different function, integrating with `boost::exception` and `boost::diagnostic_information`.

```cpp
#include <boost/throw_exception.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/core/verbose_terminate_handler.hpp>
#include <stdexcept>
#include <cstddef>
#include <iostream>

BOOST_NORETURN BOOST_NOINLINE
void throw_index_error( std::size_t i, std::size_t n,
  boost::source_location const & loc )
{
    std::string msg = "Index out of range: "
      + boost::lexical_cast<std::string>( i ) + " >= "
      + boost::lexical_cast<std::string>( n );

    boost::throw_exception( std::out_of_range( msg ), loc );
}

void f1( std::size_t i, std::size_t n )
{
    if( i >= n )
    {
        throw_index_error( i, n, BOOST_CURRENT_LOCATION );
    }
}

void f2( std::size_t i, std::size_t n )
{
    if( i >= n )
    {
        throw_index_error( i, n, BOOST_CURRENT_LOCATION );
    }
}

int main()
{
    std::set_terminate( boost::core::verbose_terminate_handler );

    f1( 0, 3 );
    f2( 4, 3 );
}
```

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

### Throw with Source Location

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Throws an exception, ensuring that the provided source location is associated with it. If exceptions are not available, it defaults to calling boost::throw_exception.

```cpp
template<class E> BOOST_NORETURN void throw_with_location( E && e,
  boost::source_location const & loc = BOOST_CURRENT_LOCATION );
```

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

### Throw Exception with Implicit Source Location (C++)

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/index

Demonstrates using boost::throw_with_location to throw an exception where the source location is automatically captured. This requires including boost/throw_exception.hpp and boost/core/verbose_terminate_handler.hpp. The function implicitly captures the location of the call to boost::throw_with_location.

```cpp
#include <boost/throw_exception.hpp>
#include <boost/core/verbose_terminate_handler.hpp>
#include <stdexcept>

int f1( int x )
{
    if( x < 0 )
    {
        boost::throw_with_location(
            std::invalid_argument( "f1: x cannot be negative" ));
    }

    return x;
}

int main()
{
    std::set_terminate( boost::core::verbose_terminate_handler );

    return f1( -4 );
}

```

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

### Throw Exception with Source Location

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/index

Declares the `throw_exception` overload that includes source location information. This version allows associating a `boost::source_location` with the thrown exception, aiding in debugging. The behavior depends on the availability of exceptions and specific preprocessor definitions.

```cpp
#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e,
  boost::source_location const & loc ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e,
  boost::source_location const & loc );

#endif
```

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

### boost::throw_with_location with Explicit Source Location in C++

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Illustrates using boost::throw_with_location with an explicitly provided source location. Helper functions like 'throw_invalid_argument' can take a 'boost::source_location' argument, defaulting to BOOST_CURRENT_LOCATION. This allows exception locations to point to the call site rather than within the helper function, aiding in pinpointing the error origin.

```cpp
#include <boost/throw_exception.hpp>
#include <boost/core/verbose_terminate_handler.hpp>
#include <stdexcept>

BOOST_NORETURN BOOST_NOINLINE
void throw_invalid_argument( char const * msg,
    boost::source_location const & loc )
{
    boost::throw_with_location( std::invalid_argument( msg ), loc );
}

int f1( int x,
    boost::source_location const & loc = BOOST_CURRENT_LOCATION )
{
    if( x < 0 )
    {
        throw_invalid_argument( "f1: x cannot be negative", loc );
    }

    return x;
}

int f2( int x,
    boost::source_location const & loc = BOOST_CURRENT_LOCATION )
{
    if( x < 0 )
    {
        throw_invalid_argument( "f2: x cannot be negative", loc );
    }

    return x;
}

int main()
{
    std::set_terminate( boost::core::verbose_terminate_handler );

    return f1( 3 ) + f2( -11 );
}

```

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

### Throw Exception without Source Location

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/index

Defines the `throw_exception` function for throwing exceptions. It handles cases where exceptions are disabled by the user or when Boost.Exception integration is required. The function signature varies based on whether exceptions are enabled.

```cpp
#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e );

#endif
```

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

### Throw Exception (with and without Exceptions)

Source: https://www.boost.org/doc/libs/latest/libs/throw_exception/doc/html/throw_exception

Defines the throw_exception function. If Boost exceptions are disabled, it declares a user-defined function. Otherwise, it throws the provided exception object, potentially augmenting it with boost::exception capabilities and source location information.

```cpp
#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e );

#endif
```

```cpp
#if defined( BOOST_NO_EXCEPTIONS )

BOOST_NORETURN void throw_exception( std::exception const & e,
  boost::source_location const & loc ); // user defined

#else

template<class E> BOOST_NORETURN void throw_exception( E const & e,
  boost::source_location const & loc );

#endif
```

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