### Boost Tokenizer Example Usage

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/tokenizer

A C++ example demonstrating the basic usage of the Boost Tokenizer class. It tokenizes a string based on default delimiters and iterates through the resulting tokens, printing each one to standard output.

```cpp
// simple_example_1.cpp
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "This is,  a test";
   tokenizer<> tok(s);
   for(tokenizer<>::iterator beg=tok.begin(); beg!=tok.end();++beg){
       cout << *beg << "\n";
   }
}
```

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

### Boost Token Iterator Example Usage

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/token_iterator

A C++ example demonstrating the usage of Boost Token Iterator to parse a string into tokens based on an offset separator. It shows how to create and use the token iterator to iterate and print the tokens.

```cpp
/// simple_example_5.cpp
#include<iostream>
#include<boost/token_iterator.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "12252001";
   int offsets[] = {2,2,4};
   offset_separator f(offsets, offsets+3);
   typedef token_iterator_generator<offset_separator>::type Iter;
   Iter beg = make_token_iterator<string>(s.begin(),s.end(),f);
   Iter end = make_token_iterator<string>(s.end(),s.end(),f); 
   // The above statement could also have been what is below
   // Iter end;
   for(;beg!=end;++beg){
     cout << *beg << "\n";
   }
}

```

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

### Basic String Tokenization with Default Delimiters in C++

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/introduc

Demonstrates basic tokenization of a string into words using Boost Tokenizer with default char_delimiters_separator. The example splits a phrase by spaces and punctuation characters. Requires boost/tokenizer.hpp header and iterates through tokens using the tokenizer's begin() and end() methods.

```C++
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "This is,  a test";
   tokenizer<> tok(s);
   for(tokenizer<>::iterator beg=tok.begin(); beg!=tok.end();++beg){
       cout << *beg << "\n";
   }
}
```

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

### Tokenizing with Default Boost char_separator Constructor

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_separator

This example utilizes the default constructor of boost::char_separator, which tokenizes based on punctuation and whitespace characters. It provides a quick way to split sentences or phrases into words and punctuation, ignoring standard whitespace as delimiters. This is useful for basic text parsing tasks.

```cpp
#include <iostream>
#include <boost/tokenizer.hpp>
#include <string>

int main()
{
   std::string str = "This is,  a test";
   typedef boost::tokenizer<boost::char_separator<char> > Tok;
   boost::char_separator<char> sep; // default constructed
   Tok tok(str, sep);
   for(Tok::iterator tok_iter = tok.begin(); tok_iter != tok.end(); ++tok_iter)
     std::cout << "<" << *tok_iter << "> ";
   std::cout << "\n";
   return EXIT_SUCCESS;
}

```

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

### Tokenizing a String with Char Delimiters Separator

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_delimiters_separator

An example demonstrating how to use char_delimiters_separator with Boost's tokenizer to split a string into tokens based on spaces and commas. It iterates through the tokens and prints them.

```cpp
// simple_example_4.cpp
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "This is,  a test";
   tokenizer<char_delimiters_separator<char> > tok(s);
   for(tokenizer<char_delimiters_separator<char> >::iterator beg=tok.begin(); beg!=tok.end();++beg){
       cout << *beg << "\n";
   }
}
```

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

### Tokenize String with Offset Separator in C++

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/offset_separator

Demonstrates how to use the offset_separator class to break a string into tokens based on specified offsets. The example tokenizes the string "12252001" with offsets (2,2,4), producing tokens "12", "25", and "2001". It includes the necessary Boost headers and shows iteration through tokens.

```cpp
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "12252001";
   int offsets[] = {2,2,4};
   offset_separator f(offsets, offsets+3);
   tokenizer<offset_separator> tok(s,f);
   for(tokenizer<offset_separator>::iterator beg=tok.begin(); beg!=tok.end();++beg){
     cout << *beg << "\n";
   }
}
```

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

### Boost Tokenizer with Escaped List Separator Example

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/escaped_list_separator

This C++ code demonstrates how to use the escaped_list_separator with Boost.Tokenizer to parse a string containing fields with embedded quotes and commas. It iterates through the tokens and prints each one.

```cpp
// simple_example_2.cpp
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "Field 1,\"putting quotes around fields, allows commas\",Field 3";
   tokenizer<escaped_list_separator<char> > tok(s);
   for(tokenizer<escaped_list_separator<char> >::iterator beg=tok.begin(); beg!=tok.end();++beg){
       cout << *beg << "\n";
   }
}
```

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

### Offset-Based Token Splitting in C++

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/introduc

Uses offset_separator TokenizerFunction to split a string into tokens based on specified character offsets rather than delimiters. The example splits "12252001" into three tokens ("12", "25", "2001") using offsets of 2, 2, and 4. Requires passing the offset configuration to the tokenizer constructor.

```C++
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "12252001";
   int offsets[] = {2,2,4};
   offset_separator f(offsets, offsets+3);
   tokenizer<offset_separator> tok(s,f);
   for(tokenizer<offset_separator>::iterator beg=tok.begin(); beg!=tok.end();++beg){
       cout << *beg << "\n";
   }
}
```

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

### Tokenizing with Dropped Delimiters using Boost char_separator

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_separator

This example demonstrates using boost::char_separator to split a string into tokens based on specified delimiters ('-', ';', '|'). Delimiters are dropped from the output, and empty tokens are ignored by default. It's suitable for simple string splitting where delimiters are not needed in the result.

```cpp
#include <iostream>
#include <boost/tokenizer.hpp>
#include <string>

int main()
{
  std::string str = ";;Hello|world||-foo--bar;yow;baz|";
  typedef boost::tokenizer<boost::char_separator<char> > 
    tokenizer;
  boost::char_separator<char> sep("-;| ");
  tokenizer tokens(str, sep);
  for (tokenizer::iterator tok_iter = tokens.begin();
       tok_iter != tokens.end(); ++tok_iter)
    std::cout << "<" << *tok_iter << "> ";
  std::cout << "\n";
  return EXIT_SUCCESS;
}

```

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

### Tokenizing with Kept Delimiters and Empty Tokens using Boost char_separator

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_separator

This example shows tokenizing a string where specific delimiters ('|') are kept as output tokens, while others ('-' and ';') are dropped. It also explicitly enables the 'keep_empty_tokens' option, ensuring that consecutive delimiters result in empty tokens in the output. This is useful when the delimiters themselves are significant parts of the data.

```cpp
#include <iostream>
#include <boost/tokenizer.hpp>
#include <string>

int main()
{
    std::string str = ";;Hello|world||-foo--bar;yow;baz|";
    typedef boost::tokenizer<boost::char_separator<char> > 
        tokenizer;
    boost::char_separator<char> sep("-;", "|", boost::keep_empty_tokens);
    tokenizer tokens(str, sep);
    for (tokenizer::iterator tok_iter = tokens.begin();
         tok_iter != tokens.end(); ++tok_iter)
      std::cout << "<" << *tok_iter << "> ";
    std::cout << "\n";
    return EXIT_SUCCESS;
}

```

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

### CSV Parsing with Escaped List Separator in C++

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/introduc

Parses comma-separated value (CSV) formatted strings using escaped_list_separator TokenizerFunction, which handles quoted fields containing commas. This example extracts three fields from a CSV line where the second field contains commas within quotes. Requires boost/tokenizer.hpp and properly handles escaped characters.

```C++
#include<iostream>
#include<boost/tokenizer.hpp>
#include<string>

int main(){
   using namespace std;
   using namespace boost;
   string s = "Field 1,\"putting quotes around fields, allows commas\",Field 3";
   tokenizer<escaped_list_separator<char> > tok(s);
   for(tokenizer<escaped_list_separator<char> >::iterator beg=tok.begin(); beg!=tok.end();++beg){
       cout << *beg << "\n";
   }
}
```

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

### Boost Tokenizer Construction and Assignment

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/tokenizer

Illustrates the various constructors and the `assign` member function for the Boost Tokenizer class. These methods allow initialization or re-assignment of the sequence to be parsed and the tokenization function.

```cpp
tokenizer(Iterator first, Iterator last,const TokenizerFunc& f = TokenizerFunc())

template<class Container>
tokenizer(const Container& c,const TokenizerFunc& f = TokenizerFunc())

void assign(Iterator first, Iterator last)

void assign(Iterator first, Iterator last, const TokenizerFunc& f)

template<class Container>
void assign(const Container& c)

template<class Container>
void assign(const Container& c, const TokenizerFunc& f)
```

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

### Char Delimiters Separator Constructor

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_delimiters_separator

Shows the constructor for char_delimiters_separator, which allows specifying whether to return delimiters and which delimiters are returnable or non-returnable.

```cpp
explicit char_delimiters_separator(bool return_delims = false, 
const Char* returnable = "",const Char* nonreturnable = "" )
```

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

### Make Token Iterator Function Definition

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/token_iterator

Provides the make_token_iterator function template, which is a factory function to create token iterators. It takes begin and end iterators of the sequence and a tokenizer functor as input.

```cpp
template<class Type, class Iterator, class TokenizerFunc>
typename token_iterator_generator<TokenizerFunc,Iterator,Type>::type 
make_token_iterator(Iterator begin, Iterator end,const TokenizerFunc& fun)

```

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

### Boost Tokenizer Class Definition

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/tokenizer

Defines the Boost Tokenizer class with template parameters for the tokenization function, iterator type, and token type. The class provides a container view of tokens from a sequence, parsing them on demand.

```cpp
template <
        class TokenizerFunc = char_delimiters_separator<char>,
        class Iterator = std::string::const_iterator,
        class Type = std::string
  >
  class tokenizer
```

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

### Escaped List Separator Constructor with String Parameters

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/escaped_list_separator

This C++ code snippet illustrates an overloaded constructor for escaped_list_separator that accepts strings for escape, separator, and quote characters. This provides more flexibility in defining these delimiters.

```cpp
escaped_list_separator(string_type e, string_type c, string_type q)
```

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

### Escaped List Separator Constructor with Default Parameters

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/escaped_list_separator

This C++ code snippet shows the declaration of the escaped_list_separator constructor. It allows specifying custom characters for escape, separator, and quote, with defaults set to '\\', ',', and '"' respectively.

```cpp
explicit escaped_list_separator(Char e = '\\', Char c = ',', Char q = '"')
```

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

### Default Constructor for char_separator

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_separator

Creates a char_separator object using default delimiter identification. Whitespace characters are treated as dropped delimiters, punctuation characters as kept delimiters, and empty tokens are dropped. This provides a convenient default for common tokenizing scenarios.

```cpp
explicit char_separator()
```

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

### Constructor for char_separator with explicit delimiters

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_separator

Initializes a char_separator object with specified dropped and kept delimiters. It allows control over whether delimiters themselves appear as tokens and whether empty tokens are preserved. This constructor is used to configure the tokenizing behavior.

```cpp
explicit char_separator(const Char* dropped_delims,
                        const Char* kept_delims = "",
                        empty_token_policy empty_tokens = drop_empty_tokens)
```

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

### Token Iterator Generator Class Definition

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/token_iterator

Defines the token_iterator_generator class, which is a template class used to create token iterators. It allows customization of the tokenizer function, iterator type, and token type.

```cpp
template <
        class TokenizerFunc = char_delimiters_separator<char>,
        class Iterator = std::string::const_iterator,
        class Type = std::string
> class token_iterator_generator 

```

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

### Offset Separator Class Declaration

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/offset_separator

Declares the offset_separator template class with its constructor signature. The constructor accepts an iterator range of integer offsets and two boolean parameters to control wrapping and partial token behavior.

```cpp
template<typename Iter>
offset_separator(Iter begin, Iter end, bool bwrapoffsets = true, bool breturnpartiallast = true)
```

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

### Boost Char Delimiters Separator Class Definition

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_delimiters_separator

Defines the char_delimiters_separator class template, an implementation of TokenizerFunction for breaking text into tokens. It's the default for tokenizer and token_iterator_generator.

```cpp
template <class Char, class Traits = std::char_traits<Char> >
class char_delimiters_separator{

}
```

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

### Tokenization Operator for char_separator

Source: https://www.boost.org/doc/libs/latest/libs/tokenizer/doc/char_separator

The primary function called by token iterators to perform the tokenizing operation. It advances the input iterators and extracts the next token based on the configured delimiters. Users typically do not call this function directly.

```cpp
template <typename InputIterator, typename Token>
bool operator()(InputIterator& next, InputIterator end, Token& tok)
```

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