daw_json_iostream.h

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// Copyright (c) Darrell Wright
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/beached/daw_json_link
//
 
#pragma once
 
#include "daw/json/impl/version.h"
 
#include "daw/json/daw_json_link.h"
 
#include <daw/daw_cpp_feature_check.h>
#include <daw/daw_enable_requires.h>
#include <daw/daw_traits.h>
 
#include <iostream>
#include <type_traits>
 
namespace daw::json {
  inline namespace DAW_JSON_VER {
    namespace json_details {
      DAW_JSON_MAKE_REQ_TYPE_ALIAS_TRAIT(
        is_opted_into_json_iostreams_v,
        json_data_contract<T>::opt_into_iostreams );
 
#if defined( DAW_HAS_CPP20_CONCEPTS )
      template<typename Container>
      concept is_container_opted_into_json_iostreams_v = requires {
        typename Container::value_type;
      }
      and is_opted_into_json_iostreams_v<typename Container::value_type>;
#else
      template<typename, typename = void>
      inline constexpr bool is_container_opted_into_json_iostreams_v = false;
 
      template<typename Container>
      inline constexpr bool is_container_opted_into_json_iostreams_v<
        Container, std::void_t<typename Container::value_type>> =
        is_opted_into_json_iostreams_v<typename Container::value_type>;
#endif
    } // namespace json_details
  } // namespace DAW_JSON_VER
} // namespace daw::json
 
template<typename T DAW_ENABLEIF(
  daw::json::json_details::is_opted_into_json_iostreams_v<T> )>
DAW_REQUIRES( daw::json::json_details::is_opted_into_json_iostreams_v<T> )
std::ostream &operator<<( std::ostream &os, T const &value ) {
  return daw::json::to_json( value, os );
}
 
template<typename Container DAW_ENABLEIF(
  daw::json::json_details::is_container_opted_into_json_iostreams_v<
    Container> )>
DAW_REQUIRES(
  daw::json::json_details::is_container_opted_into_json_iostreams_v<Container> )
std::ostream &
operator<<( std::ostream &os, Container const &c ) {
  return daw::json::to_json_array( c, os );
}