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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
#include "doctest_compatibility.h"
#include <nlohmann/json.hpp>
using nlohmann::json;
#include <list>
namespace
{
TEST_CASE("Use arbitrary stdlib container")
{
std::string raw_data = "[1,2,3,4]";
std::list<char> data(raw_data.begin(), raw_data.end());
json as_json = json::parse(data.begin(), data.end());
CHECK(as_json.at(0) == 1);
CHECK(as_json.at(1) == 2);
CHECK(as_json.at(2) == 3);
CHECK(as_json.at(3) == 4);
}
struct MyContainer
{
const char* data;
};
const char* begin(const MyContainer& c)
{
return c.data;
}
const char* end(const MyContainer& c)
{
return c.data + strlen(c.data); // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
}
TEST_CASE("Custom container non-member begin/end")
{
const MyContainer data{"[1,2,3,4]"};
json as_json = json::parse(data);
CHECK(as_json.at(0) == 1);
CHECK(as_json.at(1) == 2);
CHECK(as_json.at(2) == 3);
CHECK(as_json.at(3) == 4);
}
TEST_CASE("Custom container member begin/end")
{
struct MyContainer2
{
const char* data;
const char* begin() const noexcept
{
return data;
}
const char* end() const noexcept
{
return data + strlen(data); // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
}
};
const MyContainer2 data{"[1,2,3,4]"};
json as_json = json::parse(data);
CHECK(as_json.at(0) == 1);
CHECK(as_json.at(1) == 2);
CHECK(as_json.at(2) == 3);
CHECK(as_json.at(3) == 4);
}
TEST_CASE("Custom iterator")
{
const char* raw_data = "[1,2,3,4]";
struct MyIterator
{
using difference_type = std::size_t;
using value_type = char;
using pointer = const char*;
using reference = const char&;
using iterator_category = std::input_iterator_tag;
MyIterator& operator++()
{
++ptr; // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
return *this;
}
reference operator*() const
{
return *ptr;
}
bool operator!=(const MyIterator& rhs) const
{
return ptr != rhs.ptr;
}
const char* ptr;
};
// avoid -Wunused-local-typedefs
CHECK(std::is_same<MyIterator::difference_type, std::size_t>::value);
CHECK(std::is_same<MyIterator::value_type, char>::value);
CHECK(std::is_same<MyIterator::pointer, const char*>::value);
CHECK(std::is_same<MyIterator::reference, const char&>::value);
CHECK(std::is_same<MyIterator::iterator_category, std::input_iterator_tag>::value);
const MyIterator begin{raw_data};
const MyIterator end{raw_data + strlen(raw_data)}; // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
json as_json = json::parse(begin, end);
CHECK(as_json.at(0) == 1);
CHECK(as_json.at(1) == 2);
CHECK(as_json.at(2) == 3);
CHECK(as_json.at(3) == 4);
}
} // namespace
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