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Contents
// Copyright (c) 2018-2022 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/json/
#ifndef TAO_JSON_MESSAGE_EXTENSION_HPP
#define TAO_JSON_MESSAGE_EXTENSION_HPP
#include <ostream>
#include <string>
namespace tao::json
{
template< typename T, typename = void >
struct message_extension
{
const T& m_v;
explicit message_extension( const T& v ) noexcept
: m_v( v )
{}
friend std::ostream& operator<<( std::ostream& os, const message_extension& /*unused*/ ) noexcept
{
return os;
}
};
template< typename T >
struct message_extension< T, decltype( (void)std::declval< const T& >().public_base().append_message_extension( std::declval< std::ostream& >() ) ) >
{
const T& m_v;
explicit message_extension( const T& v ) noexcept
: m_v( v )
{}
friend std::ostream& operator<<( std::ostream& os, const message_extension& v )
{
os << ' ';
v.m_v.public_base().append_message_extension( os );
return os;
}
};
template< typename T >
message_extension( const T& ) -> message_extension< T >;
} // namespace tao::json
#endif
Version data entries
7 entries across 7 versions & 1 rubygems