tests/src/unit-class_iterator.cpp · AmaZzzIng/json

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json

tests

src

unit-class_iterator.cpp

unit-class_iterator.cpp 16.79 KB

// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013 - 2025 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT

#include "doctest_compatibility.h"

#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;

template<typename Iter>
using can_post_increment_temporary = decltype((std::declval<Iter>()++)++);

template<typename Iter>
using can_post_decrement_temporary = decltype((std::declval<Iter>()--)--);

TEST_CASE("iterator class")
{
 SECTION("construction")
 {
 SECTION("constructor")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it(&j);
 }

SECTION("object")
 {
 json j(json::value_t::object);
 json::iterator const it(&j);
 }

SECTION("array")
 {
 json j(json::value_t::array);
 json::iterator const it(&j);
 }
 }

SECTION("copy assignment")
 {
 json j(json::value_t::null);
 json::iterator const it(&j);
 json::iterator it2(&j);
 it2 = it;
 }
 }

SECTION("initialization")
 {
 SECTION("set_begin")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it(&j);
 it.set_begin();
 CHECK((it == j.begin()));
 }

SECTION("object")
 {
 json j(json::value_t::object);
 json::iterator it(&j);
 it.set_begin();
 CHECK((it == j.begin()));
 }

SECTION("array")
 {
 json j(json::value_t::array);
 json::iterator it(&j);
 it.set_begin();
 CHECK((it == j.begin()));
 }
 }

SECTION("set_end")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it(&j);
 it.set_end();
 CHECK((it == j.end()));
 }

SECTION("object")
 {
 json j(json::value_t::object);
 json::iterator it(&j);
 it.set_end();
 CHECK((it == j.end()));
 }

SECTION("array")
 {
 json j(json::value_t::array);
 json::iterator it(&j);
 it.set_end();
 CHECK((it == j.end()));
 }
 }
 }

SECTION("element access")
 {
 SECTION("operator*")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.begin();
 CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK(*it == json(17));
 it = j.end();
 CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator const it = j.begin();
 CHECK(*it == json("bar"));
 }

SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator const it = j.begin();
 CHECK(*it == json(1));
 }
 }

SECTION("operator->")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.begin();
 CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK(std::string(it->type_name()) == "number");
 it = j.end();
 CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator const it = j.begin();
 CHECK(std::string(it->type_name()) == "string");
 }

SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator const it = j.begin();
 CHECK(std::string(it->type_name()) == "number");
 }
 }
 }

SECTION("increment/decrement")
 {
 SECTION("post-increment")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 it++;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 it++;
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 it++;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.begin();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 it++;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 }

SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.begin();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 }
 }

SECTION("pre-increment")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 ++it;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 ++it;
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 ++it;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.begin();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 ++it;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 }

SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.begin();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 }
 }

SECTION("post-decrement")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 }

SECTION("number")
 {
 json j(17);
 json::iterator it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 it--;
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 it--;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.end();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 it--;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 }

SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.end();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 }
 }

SECTION("pre-decrement")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 }

SECTION("number")
 {
 json j(17);
 json::iterator it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 --it;
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 --it;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.end();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 --it;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 }

SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.end();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 }
 }
 }
 SECTION("equality-preserving")
 {
 SECTION("post-increment")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
 }
 }
 SECTION("post-decrement")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value );
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value );
 }
 }
 }
 // prevent "accidental mutation of a temporary object"
 SECTION("cert-dcl21-cpp")
 {
 using nlohmann::detail::is_detected;
 SECTION("post-increment")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
 }
 }
 SECTION("post-decrement")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
 }

}
 }
}

一键复制编辑原始数据按行查看历史

Niels Lohmann 提交于 2025年04月11日 16:41 +08:00 . :bookmark: set version to 3.12.0 (#4727)

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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013 - 2025 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT

#include "doctest_compatibility.h"

#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;

template<typename Iter>
using can_post_increment_temporary = decltype((std::declval<Iter>()++)++);

template<typename Iter>
using can_post_decrement_temporary = decltype((std::declval<Iter>()--)--);

TEST_CASE("iterator class")
{
 SECTION("construction")
 {
 SECTION("constructor")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it(&j);
 }

 SECTION("object")
 {
 json j(json::value_t::object);
 json::iterator const it(&j);
 }

 SECTION("array")
 {
 json j(json::value_t::array);
 json::iterator const it(&j);
 }
 }

 SECTION("copy assignment")
 {
 json j(json::value_t::null);
 json::iterator const it(&j);
 json::iterator it2(&j);
 it2 = it;
 }
 }

 SECTION("initialization")
 {
 SECTION("set_begin")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it(&j);
 it.set_begin();
 CHECK((it == j.begin()));
 }

 SECTION("object")
 {
 json j(json::value_t::object);
 json::iterator it(&j);
 it.set_begin();
 CHECK((it == j.begin()));
 }

 SECTION("array")
 {
 json j(json::value_t::array);
 json::iterator it(&j);
 it.set_begin();
 CHECK((it == j.begin()));
 }
 }

 SECTION("set_end")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it(&j);
 it.set_end();
 CHECK((it == j.end()));
 }

 SECTION("object")
 {
 json j(json::value_t::object);
 json::iterator it(&j);
 it.set_end();
 CHECK((it == j.end()));
 }

 SECTION("array")
 {
 json j(json::value_t::array);
 json::iterator it(&j);
 it.set_end();
 CHECK((it == j.end()));
 }
 }
 }

 SECTION("element access")
 {
 SECTION("operator*")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.begin();
 CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

 SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK(*it == json(17));
 it = j.end();
 CHECK_THROWS_WITH_AS(*it, "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

 SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator const it = j.begin();
 CHECK(*it == json("bar"));
 }

 SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator const it = j.begin();
 CHECK(*it == json(1));
 }
 }

 SECTION("operator->")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.begin();
 CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

 SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK(std::string(it->type_name()) == "number");
 it = j.end();
 CHECK_THROWS_WITH_AS(std::string(it->type_name()), "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
 }

 SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator const it = j.begin();
 CHECK(std::string(it->type_name()) == "string");
 }

 SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator const it = j.begin();
 CHECK(std::string(it->type_name()) == "number");
 }
 }
 }

 SECTION("increment/decrement")
 {
 SECTION("post-increment")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 it++;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

 SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 it++;
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 it++;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

 SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.begin();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 it++;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 }

 SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.begin();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it++;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 }
 }

 SECTION("pre-increment")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 ++it;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

 SECTION("number")
 {
 json j(17);
 json::iterator it = j.begin();
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 ++it;
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 ++it;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

 SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.begin();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 ++it;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 }

 SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.begin();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 ++it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 }
 }

 SECTION("post-decrement")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 }

 SECTION("number")
 {
 json j(17);
 json::iterator it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 it--;
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 it--;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

 SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.end();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 it--;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 }

 SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.end();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 it--;
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 }
 }

 SECTION("pre-decrement")
 {
 SECTION("null")
 {
 json j(json::value_t::null);
 json::iterator const it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 }

 SECTION("number")
 {
 json j(17);
 json::iterator it = j.end();
 CHECK((it.m_it.primitive_iterator.m_it == 1));
 --it;
 CHECK((it.m_it.primitive_iterator.m_it == 0));
 --it;
 CHECK((it.m_it.primitive_iterator.m_it != 0 && it.m_it.primitive_iterator.m_it != 1));
 }

 SECTION("object")
 {
 json j({{"foo", "bar"}});
 json::iterator it = j.end();
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->end()));
 --it;
 CHECK((it.m_it.object_iterator == it.m_object->m_data.m_value.object->begin()));
 }

 SECTION("array")
 {
 json j({1, 2, 3, 4});
 json::iterator it = j.end();
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 --it;
 CHECK((it.m_it.array_iterator == it.m_object->m_data.m_value.array->begin()));
 CHECK((it.m_it.array_iterator != it.m_object->m_data.m_value.array->end()));
 }
 }
 }
 SECTION("equality-preserving")
 {
 SECTION("post-increment")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()++), Iter >::value);
 }
 }
 SECTION("post-decrement")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value );
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK(std::is_same < decltype(std::declval<Iter&>()--), Iter >::value );
 }
 }
 }
 // prevent "accidental mutation of a temporary object"
 SECTION("cert-dcl21-cpp")
 {
 using nlohmann::detail::is_detected;
 SECTION("post-increment")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK_FALSE(is_detected<can_post_increment_temporary, Iter&>::value);
 }
 }
 SECTION("post-decrement")
 {
 SECTION("primitive_iterator_t")
 {
 using Iter = nlohmann::detail::primitive_iterator_t;
 CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
 }
 SECTION("iter_impl")
 {
 using Iter = nlohmann::detail::iter_impl<json>;
 CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
 }
 SECTION("json_reverse_iterator")
 {
 using Base = nlohmann::detail::iter_impl<json>;
 using Iter = nlohmann::detail::json_reverse_iterator<Base>;
 CHECK_FALSE(is_detected<can_post_decrement_temporary, Iter&>::value);
 }

 }
 }
}