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unit-concepts.cpp
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/*
__ _____ _____ _____
__| | __| | | | JSON for Modern C++ (test suite)
| | |__ | | | | | | version 3.7.0
|_____|_____|_____|_|___| https://github.com/nlohmann/json
Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2013-2019 Niels Lohmann <http://nlohmann.me>.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include "doctest_compatibility.h"
#include <nlohmann/json.hpp>
using nlohmann::json;
TEST_CASE("concepts")
{
SECTION("container requirements for json")
{
// X: container class: json
// T: type of objects: json
// a, b: values of type X: json
// TABLE 96 - Container Requirements
// X::value_type must return T
CHECK((std::is_same<json::value_type, json>::value));
// X::reference must return lvalue of T
CHECK((std::is_same<json::reference, json&>::value));
// X::const_reference must return const lvalue of T
CHECK((std::is_same<json::const_reference, const json&>::value));
// X::iterator must return iterator whose value_type is T
CHECK((std::is_same<json::iterator::value_type, json>::value));
// X::iterator must meet the forward iterator requirements
CHECK((std::is_base_of<std::forward_iterator_tag, typename std::iterator_traits<json::iterator>::iterator_category>::value));
// X::iterator must be convertible to X::const_iterator
CHECK((std::is_convertible<json::iterator, json::const_iterator>::value));
// X::const_iterator must return iterator whose value_type is T
CHECK((std::is_same<json::const_iterator::value_type, json>::value));
// X::const_iterator must meet the forward iterator requirements
CHECK((std::is_base_of<std::forward_iterator_tag, typename std::iterator_traits<json::const_iterator>::iterator_category>::value));
// X::difference_type must return a signed integer
CHECK((std::is_signed<json::difference_type>::value));
// X::difference_type must be identical to X::iterator::difference_type
CHECK((std::is_same<json::difference_type, json::iterator::difference_type>::value));
// X::difference_type must be identical to X::const_iterator::difference_type
CHECK((std::is_same<json::difference_type, json::const_iterator::difference_type>::value));
// X::size_type must return an unsigned integer
CHECK((std::is_unsigned<json::size_type>::value));
// X::size_type can represent any non-negative value of X::difference_type
CHECK(static_cast<json::size_type>((std::numeric_limits<json::difference_type>::max)()) <=
(std::numeric_limits<json::size_type>::max)());
// the expression "X u" has the post-condition "u.empty()"
{
json u;
CHECK(u.empty());
}
// the expression "X()" has the post-condition "X().empty()"
CHECK(json().empty());
}
SECTION("class json")
{
SECTION("DefaultConstructible")
{
CHECK(std::is_nothrow_default_constructible<json>::value);
}
SECTION("MoveConstructible")
{
CHECK(std::is_move_constructible<json>::value);
CHECK(std::is_nothrow_move_constructible<json>::value);
}
SECTION("CopyConstructible")
{
CHECK(std::is_copy_constructible<json>::value);
}
SECTION("MoveAssignable")
{
CHECK(std::is_nothrow_move_assignable<json>::value);
}
SECTION("CopyAssignable")
{
CHECK(std::is_copy_assignable<json>::value);
}
SECTION("Destructible")
{
CHECK(std::is_nothrow_destructible<json>::value);
}
SECTION("StandardLayoutType")
{
CHECK(std::is_standard_layout<json>::value);
}
}
SECTION("class iterator")
{
SECTION("CopyConstructible")
{
CHECK(std::is_nothrow_copy_constructible<json::iterator>::value);
CHECK(std::is_nothrow_copy_constructible<json::const_iterator>::value);
}
SECTION("CopyAssignable")
{
// STL iterators used by json::iterator don't pass this test in Debug mode
#if !defined(_MSC_VER) || (_ITERATOR_DEBUG_LEVEL == 0)
CHECK(std::is_nothrow_copy_assignable<json::iterator>::value);
CHECK(std::is_nothrow_copy_assignable<json::const_iterator>::value);
#endif
}
SECTION("Destructible")
{
CHECK(std::is_nothrow_destructible<json::iterator>::value);
CHECK(std::is_nothrow_destructible<json::const_iterator>::value);
}
SECTION("Swappable")
{
{
json j {1, 2, 3};
json::iterator it1 = j.begin();
json::iterator it2 = j.end();
std::swap(it1, it2);
CHECK(it1 == j.end());
CHECK(it2 == j.begin());
}
{
json j {1, 2, 3};
json::const_iterator it1 = j.cbegin();
json::const_iterator it2 = j.cend();
std::swap(it1, it2);
CHECK(it1 == j.end());
CHECK(it2 == j.begin());
}
}
}
}