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http::param_list

A list of parameters in an HTTP extension field value.

Synopsis

Defined in header <boost/beast/http/rfc7230.hpp>

class param_list
Types

Name

Description

const_iterator

A constant iterator to the list.

value_type

The type of each element in the list.

Member Functions

Name

Description

begin

Return a const iterator to the beginning of the list.

cbegin

Return a const iterator to the beginning of the list.

cend

Return a const iterator to the end of the list.

end

Return a const iterator to the end of the list.

param_list

Default constructor.

Construct a list.

Description

This container allows iteration of the parameter list in an HTTP extension. The parameter list is a series of name/value pairs with each pair starting with a semicolon. The value is optional. If a parsing error is encountered while iterating the string, the behavior of the container will be as if a string containing only characters up to but excluding the first invalid character was used to construct the list.

BNF
param-list  = *( OWS ";" OWS param )
param       = token OWS [ "=" OWS ( token / quoted-string ) ]

To use this class, construct with the string to be parsed and then use http::param_list::begin and http::param_list::end, or range-for to iterate each item:

Example
for(auto const& param : param_list{";level=9;no_context_takeover;bits=15"})
{
    std::cout << ";" << param.first;
    if(! param.second.empty())
        std::cout << "=" << param.second;
    std::cout << "\n";
}

Convenience header <boost/beast/http.hpp>


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