daw_container_traits.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/concepts/daw_container_traits_fwd.h"
 
#include <daw/cpp_17.h>
#include <daw/daw_cpp20_concept.h>
#include <daw/daw_enable_requires.h>
 
#include <array>
#include <cstddef>
#include <iterator>
#include <type_traits>
 
namespace daw::json {
  inline namespace DAW_JSON_VER {
    namespace concepts {
      namespace container_detect {
        DAW_JSON_MAKE_REQ_TRAIT(
          is_container_v, (void)( std::begin( std::declval<T &>( ) ) ),
          (void)( std::end( std::declval<T &>( ) ) ),
          (void)( std::declval<typename T::value_type>( ) ),
          (void)( std::declval<T &>( ).insert(
            std::end( std::declval<T &>( ) ),
            std::declval<typename T::value_type>( ) ) ) );
      } // namespace container_detect
 
      template<typename T>
      DAW_REQUIRES( container_detect::is_container_v<T> )
      struct container_traits<T DAW_ENABLEIF_S(
        container_detect::is_container_v<T> )> : std::true_type {};
 
      template<typename T, std::size_t N>
      struct container_traits<std::array<T, N>> : std::true_type {};
 
      template<typename T>
      DAW_CPP20_CONCEPT is_container_v = container_traits<T>::value;
    } // namespace concepts
  } // namespace DAW_JSON_VER
} // namespace daw::json