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json/tests/src/unit-comparison.cpp
Niels Lohmann 2ea6d8c127 Require the found key to equal the looked-up key when comparing objects (#5720) 
For an object type whose comparator treats unequal keys as equivalent
(for example a std::map with a case-insensitive comparator),
compare_iteratively() looked up a mismatched left key in the right
object with find(), which uses the object's own comparator, and
accepted whatever entry it found without checking that the keys are
actually equal. A case-insensitive comparator then found "KEY" for
"key", so two objects nested past the recursion bound (or at every
depth with JSON_NO_THREAD_LOCAL) could compare equal even though the
object type's own operator== - and basic_json itself, below the bound
- consider them different.

Accept the found entry only if its key equals (not just compares
equivalent to) the looked-up key.

Fixes #5655.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
2026-09-30 20:07:56 +02:00

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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
// cmake/test.cmake selects the C++ standard versions with which to build a
// unit test based on the presence of JSON_HAS_CPP_<VERSION> macros.
// When using macros that are only defined for particular versions of the standard
// (e.g., JSON_HAS_FILESYSTEM for C++17 and up), please mention the corresponding
// version macro in a comment close by, like this:
// JSON_HAS_CPP_<VERSION> (do not remove; see note at top of file)
#include "doctest_compatibility.h"
#include <algorithm>
#include <cctype>
#include <cstdint>
#include <map>
#include <string>
#include <utility>
#include <vector>
#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;
#if JSON_HAS_THREE_WAY_COMPARISON
// this can be replaced with the doctest stl extension header in version 2.5
namespace doctest
{
template<> struct StringMaker<std::partial_ordering>
{
static String convert(const std::partial_ordering& order)
{
if (order == std::partial_ordering::less)
{
return "std::partial_ordering::less";
}
if (order == std::partial_ordering::equivalent)
{
return "std::partial_ordering::equivalent";
}
if (order == std::partial_ordering::greater)
{
return "std::partial_ordering::greater";
}
if (order == std::partial_ordering::unordered)
{
return "std::partial_ordering::unordered";
}
return "{?}";
}
};
} // namespace doctest
#endif
namespace
{
// helper function to check std::less<json::value_t>
// see https://en.cppreference.com/w/cpp/utility/functional/less
template <typename A, typename B, typename U = std::less<json::value_t>>
bool f(A a, B b, U u = U())
{
return u(a, b);
}
} // namespace
TEST_CASE("lexicographical comparison operators")
{
constexpr auto f_ = false;
constexpr auto _t = true;
constexpr auto nan = std::numeric_limits<json::number_float_t>::quiet_NaN();
#if JSON_HAS_THREE_WAY_COMPARISON
constexpr auto lt = std::partial_ordering::less;
constexpr auto gt = std::partial_ordering::greater;
constexpr auto eq = std::partial_ordering::equivalent;
constexpr auto un = std::partial_ordering::unordered;
#endif
#if JSON_HAS_THREE_WAY_COMPARISON
INFO("using 3-way comparison");
#endif
#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
INFO("using legacy comparison");
#endif
//REQUIRE(std::numeric_limits<json::number_float_t>::has_quiet_NaN);
REQUIRE(std::isnan(nan));
SECTION("types")
{
std::vector<json::value_t> j_types =
{
json::value_t::null,
json::value_t::boolean,
json::value_t::number_integer,
json::value_t::number_unsigned,
json::value_t::number_float,
json::value_t::object,
json::value_t::array,
json::value_t::string,
json::value_t::binary,
json::value_t::discarded
};
std::vector<std::vector<bool>> expected_lt =
{
//0 1 2 3 4 5 6 7 8 9
{f_, _t, _t, _t, _t, _t, _t, _t, _t, f_}, // 0
{f_, f_, _t, _t, _t, _t, _t, _t, _t, f_}, // 1
{f_, f_, f_, f_, f_, _t, _t, _t, _t, f_}, // 2
{f_, f_, f_, f_, f_, _t, _t, _t, _t, f_}, // 3
{f_, f_, f_, f_, f_, _t, _t, _t, _t, f_}, // 4
{f_, f_, f_, f_, f_, f_, _t, _t, _t, f_}, // 5
{f_, f_, f_, f_, f_, f_, f_, _t, _t, f_}, // 6
{f_, f_, f_, f_, f_, f_, f_, f_, _t, f_}, // 7
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 8
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 9
};
SECTION("comparison: less")
{
REQUIRE(expected_lt.size() == j_types.size());
for (size_t i = 0; i < j_types.size(); ++i)
{
REQUIRE(expected_lt[i].size() == j_types.size());
for (size_t j = 0; j < j_types.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
// check precomputed values
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
CHECK((j_types[i] < j_types[j]) == expected_lt[i][j]);
#else
CHECK(operator<(j_types[i], j_types[j]) == expected_lt[i][j]);
#endif
CHECK(f(j_types[i], j_types[j]) == expected_lt[i][j]);
}
}
}
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
SECTION("comparison: 3-way")
{
std::vector<std::vector<std::partial_ordering>> expected =
{
//0 1 2 3 4 5 6 7 8 9
{eq, lt, lt, lt, lt, lt, lt, lt, lt, un}, // 0
{gt, eq, lt, lt, lt, lt, lt, lt, lt, un}, // 1
{gt, gt, eq, eq, eq, lt, lt, lt, lt, un}, // 2
{gt, gt, eq, eq, eq, lt, lt, lt, lt, un}, // 3
{gt, gt, eq, eq, eq, lt, lt, lt, lt, un}, // 4
{gt, gt, gt, gt, gt, eq, lt, lt, lt, un}, // 5
{gt, gt, gt, gt, gt, gt, eq, lt, lt, un}, // 6
{gt, gt, gt, gt, gt, gt, gt, eq, lt, un}, // 7
{gt, gt, gt, gt, gt, gt, gt, gt, eq, un}, // 8
{un, un, un, un, un, un, un, un, un, un}, // 9
};
// check expected partial_ordering against expected boolean
REQUIRE(expected.size() == expected_lt.size());
for (size_t i = 0; i < expected.size(); ++i)
{
REQUIRE(expected[i].size() == expected_lt[i].size());
for (size_t j = 0; j < expected[i].size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK(std::is_lt(expected[i][j]) == expected_lt[i][j]);
}
}
// check 3-way comparison against expected partial_ordering
REQUIRE(expected.size() == j_types.size());
for (size_t i = 0; i < j_types.size(); ++i)
{
REQUIRE(expected[i].size() == j_types.size());
for (size_t j = 0; j < j_types.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK((j_types[i] <=> j_types[j]) == expected[i][j]); // *NOPAD*
}
}
}
#endif
}
SECTION("values")
{
json j_values =
{
nullptr, nullptr, // 0 1
-17, 42, // 2 3
8u, 13u, // 4 5
3.14159, 23.42, // 6 7
nan, nan, // 8 9
"foo", "bar", // 10 11
true, false, // 12 13
{1, 2, 3}, {"one", "two", "three"}, // 14 15
{{"first", 1}, {"second", 2}}, {{"a", "A"}, {"b", {"B"}}}, // 16 17
json::binary({1, 2, 3}), json::binary({1, 2, 4}), // 18 19
json(json::value_t::discarded), json(json::value_t::discarded) // 20 21
};
std::vector<std::vector<bool>> expected_eq =
{
//0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
{_t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 0
{_t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 1
{f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 2
{f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 3
{f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 4
{f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 5
{f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 6
{f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 7
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 8
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 9
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 10
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 11
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 12
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, f_}, // 13
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_}, // 14
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_}, // 15
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_}, // 16
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_}, // 17
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_}, // 18
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_}, // 19
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 20
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 21
};
std::vector<std::vector<bool>> expected_lt =
{
//0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_}, // 0
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_}, // 1
{f_, f_, f_, _t, _t, _t, _t, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 2
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 3
{f_, f_, f_, _t, f_, _t, f_, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 4
{f_, f_, f_, _t, f_, f_, f_, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 5
{f_, f_, f_, _t, _t, _t, f_, _t, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 6
{f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 7
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 8
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 9
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_}, // 10
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_}, // 11
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 12
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, f_, _t, _t, _t, _t, _t, _t, f_, f_}, // 13
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, _t, f_, f_, _t, _t, f_, f_}, // 14
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_}, // 15
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, f_, f_, _t, _t, f_, f_}, // 16
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, _t, _t, _t, f_, _t, _t, f_, f_}, // 17
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, f_, f_}, // 18
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 19
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 20
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 21
};
SECTION("signed/unsigned mixed comparison above INT64_MAX")
{
const json above_int64_max = static_cast<std::uint64_t>((std::numeric_limits<std::int64_t>::max)()) + 1ULL;
const json max_uint64 = (std::numeric_limits<std::uint64_t>::max)();
const json negative_one = -1;
const json one = 1;
const json max_int64 = (std::numeric_limits<std::int64_t>::max)();
CHECK_FALSE(above_int64_max == negative_one);
CHECK(above_int64_max != negative_one);
CHECK(negative_one < above_int64_max);
CHECK(negative_one <= above_int64_max);
CHECK_FALSE(negative_one > above_int64_max);
CHECK_FALSE(negative_one >= above_int64_max);
CHECK_FALSE(above_int64_max < negative_one);
CHECK_FALSE(above_int64_max <= negative_one);
CHECK(above_int64_max > negative_one);
CHECK(above_int64_max >= negative_one);
CHECK(negative_one != above_int64_max);
CHECK_FALSE(negative_one == above_int64_max);
CHECK_FALSE(max_uint64 == negative_one);
CHECK(max_uint64 != negative_one);
CHECK(negative_one < max_uint64);
CHECK(negative_one <= max_uint64);
CHECK_FALSE(negative_one > max_uint64);
CHECK_FALSE(negative_one >= max_uint64);
CHECK_FALSE(max_uint64 < negative_one);
CHECK_FALSE(max_uint64 <= negative_one);
CHECK(max_uint64 > negative_one);
CHECK(max_uint64 >= negative_one);
CHECK(negative_one != max_uint64);
CHECK_FALSE(negative_one == max_uint64);
CHECK_FALSE(one == above_int64_max);
CHECK(one != above_int64_max);
CHECK(one < above_int64_max);
CHECK(one <= above_int64_max);
CHECK_FALSE(one > above_int64_max);
CHECK_FALSE(one >= above_int64_max);
CHECK_FALSE(above_int64_max < one);
CHECK_FALSE(above_int64_max <= one);
CHECK(above_int64_max > one);
CHECK(above_int64_max >= one);
CHECK_FALSE(max_int64 == above_int64_max);
CHECK(max_int64 != above_int64_max);
CHECK(max_int64 < above_int64_max);
CHECK(max_int64 <= above_int64_max);
CHECK_FALSE(max_int64 > above_int64_max);
CHECK_FALSE(max_int64 >= above_int64_max);
CHECK_FALSE(above_int64_max < max_int64);
CHECK_FALSE(above_int64_max <= max_int64);
CHECK(above_int64_max > max_int64);
CHECK(above_int64_max >= max_int64);
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
CHECK((negative_one <=> above_int64_max) == std::partial_ordering::less); // *NOPAD*
CHECK((above_int64_max <=> negative_one) == std::partial_ordering::greater); // *NOPAD*
CHECK((negative_one <=> max_uint64) == std::partial_ordering::less); // *NOPAD*
CHECK((max_uint64 <=> negative_one) == std::partial_ordering::greater); // *NOPAD*
CHECK((one <=> above_int64_max) == std::partial_ordering::less); // *NOPAD*
CHECK((above_int64_max <=> one) == std::partial_ordering::greater); // *NOPAD*
CHECK((max_int64 <=> above_int64_max) == std::partial_ordering::less); // *NOPAD*
CHECK((above_int64_max <=> max_int64) == std::partial_ordering::greater); // *NOPAD*
#endif
}
SECTION("integer/float mixed comparison is exact")
{
// Widening the integer to a double loses precision past the
// mantissa, so 2^63-2 and 2^63-1 both used to compare equal to the
// double 2^63 while differing from each other. That makes equality
// intransitive and the ordering not a strict weak ordering.
const json below_two_63 = static_cast<std::int64_t>(9223372036854775806LL);
const json max_int64 = (std::numeric_limits<std::int64_t>::max)();
const json two_63 = 9223372036854775808.0;
CHECK_FALSE(below_two_63 == two_63);
CHECK_FALSE(max_int64 == two_63);
CHECK(below_two_63 != max_int64);
CHECK(below_two_63 < max_int64);
CHECK(below_two_63 < two_63);
CHECK(max_int64 < two_63);
CHECK(two_63 > max_int64);
CHECK_FALSE(two_63 < max_int64);
// the same past the unsigned range
const json max_uint64 = (std::numeric_limits<std::uint64_t>::max)();
const json two_64 = 18446744073709551616.0;
CHECK_FALSE(max_uint64 == two_64);
CHECK(max_uint64 < two_64);
CHECK(two_64 > max_uint64);
// values a double represents exactly still compare equal
CHECK(json(1) == json(1.0));
CHECK(json(1u) == json(1.0));
CHECK(json(-3) == json(-3.0));
CHECK(json(1) < json(1.5));
CHECK(json(1.5) < json(2));
CHECK(json(2) > json(1.5));
CHECK(json(-1) > json(-1.5));
CHECK(json(-1.5) < json(-1));
CHECK(json(-2) < json(-1.5));
// a float below the range of the integer type
CHECK(json(0) > json(-1e30));
CHECK(json(-1e30) < json(0));
CHECK(json(0u) > json(-0.5));
CHECK(json(-0.5) < json(0u));
// a NaN operand stays unordered against either integer kind
CHECK_FALSE(json(1) == json(nan));
CHECK_FALSE(json(1) < json(nan));
CHECK_FALSE(json(nan) < json(1));
CHECK_FALSE(json(1u) == json(nan));
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
CHECK((max_int64 <=> two_63) == std::partial_ordering::less); // *NOPAD*
CHECK((two_63 <=> max_int64) == std::partial_ordering::greater); // *NOPAD*
CHECK((below_two_63 <=> max_int64) == std::partial_ordering::less); // *NOPAD*
CHECK((max_uint64 <=> two_64) == std::partial_ordering::less); // *NOPAD*
CHECK((json(1) <=> json(1.0)) == std::partial_ordering::equivalent); // *NOPAD*
CHECK((json(1) <=> json(nan)) == std::partial_ordering::unordered); // *NOPAD*
#endif
}
SECTION("compares unordered")
{
std::vector<std::vector<bool>> expected =
{
//0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 0
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 1
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 2
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 3
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 4
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 5
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 6
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 7
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 8
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 9
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 10
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 11
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 12
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 13
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 14
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 15
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 16
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 17
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 18
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, _t, _t}, // 19
{_t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t}, // 20
{_t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t, _t}, // 21
};
// check if two values compare unordered as expected
REQUIRE(expected.size() == j_values.size());
for (size_t i = 0; i < j_values.size(); ++i)
{
REQUIRE(expected[i].size() == j_values.size());
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK(json::compares_unordered(j_values[i], j_values[j]) == expected[i][j]);
}
}
}
#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
SECTION("compares unordered (inverse)")
{
std::vector<std::vector<bool>> expected =
{
//0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 0
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 1
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 2
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 3
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 4
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 5
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 6
{f_, f_, f_, f_, f_, f_, f_, f_, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 7
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 8
{f_, f_, _t, _t, _t, _t, _t, _t, _t, _t, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 9
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 10
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 11
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 12
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 13
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 14
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 15
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 16
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 17
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 18
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 19
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 20
{f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_, f_}, // 21
};
// check that two values compare unordered as expected (with legacy-mode enabled)
REQUIRE(expected.size() == j_values.size());
for (size_t i = 0; i < j_values.size(); ++i)
{
REQUIRE(expected[i].size() == j_values.size());
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CAPTURE(j_values[i])
CAPTURE(j_values[j])
CHECK(json::compares_unordered(j_values[i], j_values[j], true) == expected[i][j]);
}
}
}
#endif
SECTION("comparison: equal")
{
// check that two values compare equal
REQUIRE(expected_eq.size() == j_values.size());
for (size_t i = 0; i < j_values.size(); ++i)
{
REQUIRE(expected_eq[i].size() == j_values.size());
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK((j_values[i] == j_values[j]) == expected_eq[i][j]);
}
}
// compare with null pointer
json j_null;
CHECK(j_null == nullptr);
CHECK(nullptr == j_null);
}
SECTION("comparison: not equal")
{
// check that two values compare unequal as expected
// operator!= now means exactly !(a==b) without special cases for NaN/discarded
for (size_t i = 0; i < j_values.size(); ++i)
{
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK((j_values[i] != j_values[j]) == !(j_values[i] == j_values[j]));
}
}
// compare with null pointer
const json j_null;
CHECK((j_null != nullptr) == !(j_null == nullptr));
CHECK((nullptr != j_null) == !(nullptr == j_null));
}
SECTION("comparison: less")
{
// check that two values compare less than as expected
REQUIRE(expected_lt.size() == j_values.size());
for (size_t i = 0; i < j_values.size(); ++i)
{
REQUIRE(expected_lt[i].size() == j_values.size());
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK((j_values[i] < j_values[j]) == expected_lt[i][j]);
}
}
}
SECTION("comparison: less than or equal equal")
{
// check that two values compare less than or equal as expected
for (size_t i = 0; i < j_values.size(); ++i)
{
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
if (json::compares_unordered(j_values[i], j_values[j], true))
{
// if two values compare unordered,
// check that the boolean comparison result is always false
CHECK_FALSE(j_values[i] <= j_values[j]);
}
else
{
// otherwise, check that they compare according to their definition
// as the inverse of less than with the operand order reversed
CHECK((j_values[i] <= j_values[j]) == !(j_values[j] < j_values[i]));
}
}
}
}
SECTION("comparison: greater than")
{
// check that two values compare greater than as expected
for (size_t i = 0; i < j_values.size(); ++i)
{
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
if (json::compares_unordered(j_values[i], j_values[j]))
{
// if two values compare unordered,
// check that the boolean comparison result is always false
CHECK_FALSE(j_values[i] > j_values[j]);
}
else
{
// otherwise, check that they compare according to their definition
// as the inverse of less than or equal which is defined as
// the inverse of less than with the operand order reversed
CHECK((j_values[i] > j_values[j]) == !(j_values[i] <= j_values[j]));
CHECK((j_values[i] > j_values[j]) == !!(j_values[j] < j_values[i]));
}
}
}
}
SECTION("comparison: greater than or equal")
{
// check that two values compare greater than or equal as expected
for (size_t i = 0; i < j_values.size(); ++i)
{
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
if (json::compares_unordered(j_values[i], j_values[j], true))
{
// if two values compare unordered,
// check that the boolean result is always false
CHECK_FALSE(j_values[i] >= j_values[j]);
}
else
{
// otherwise, check that they compare according to their definition
// as the inverse of less than
CHECK((j_values[i] >= j_values[j]) == !(j_values[i] < j_values[j]));
}
}
}
}
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
SECTION("comparison: 3-way")
{
std::vector<std::vector<std::partial_ordering>> expected =
{
//0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
{eq, eq, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, un, un}, // 0
{eq, eq, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, un, un}, // 1
{gt, gt, eq, lt, lt, lt, lt, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 2
{gt, gt, gt, eq, gt, gt, gt, gt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 3
{gt, gt, gt, lt, eq, lt, gt, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 4
{gt, gt, gt, lt, gt, eq, gt, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 5
{gt, gt, gt, lt, lt, lt, eq, lt, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 6
{gt, gt, gt, lt, gt, gt, gt, eq, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 7
{gt, gt, un, un, un, un, un, un, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 8
{gt, gt, un, un, un, un, un, un, un, un, lt, lt, gt, gt, lt, lt, lt, lt, lt, lt, un, un}, // 9
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, eq, gt, gt, gt, gt, gt, gt, gt, lt, lt, un, un}, // 10
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, eq, gt, gt, gt, gt, gt, gt, lt, lt, un, un}, // 11
{gt, gt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, eq, gt, lt, lt, lt, lt, lt, lt, un, un}, // 12
{gt, gt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, lt, eq, lt, lt, lt, lt, lt, lt, un, un}, // 13
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, eq, lt, gt, gt, lt, lt, un, un}, // 14
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, gt, eq, gt, gt, lt, lt, un, un}, // 15
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, lt, lt, eq, gt, lt, lt, un, un}, // 16
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, lt, lt, gt, gt, lt, lt, lt, eq, lt, lt, un, un}, // 17
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, eq, lt, un, un}, // 18
{gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, gt, eq, un, un}, // 19
{un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un}, // 20
{un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un, un}, // 21
};
// check expected partial_ordering against expected booleans
REQUIRE(expected.size() == expected_eq.size());
REQUIRE(expected.size() == expected_lt.size());
for (size_t i = 0; i < expected.size(); ++i)
{
REQUIRE(expected[i].size() == expected_eq[i].size());
REQUIRE(expected[i].size() == expected_lt[i].size());
for (size_t j = 0; j < expected[i].size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK(std::is_eq(expected[i][j]) == expected_eq[i][j]);
CHECK(std::is_lt(expected[i][j]) == expected_lt[i][j]);
if (std::is_gt(expected[i][j]))
{
CHECK((!expected_eq[i][j] && !expected_lt[i][j]));
}
}
}
// check that two values compare according to their expected ordering
REQUIRE(expected.size() == j_values.size());
for (size_t i = 0; i < j_values.size(); ++i)
{
REQUIRE(expected[i].size() == j_values.size());
for (size_t j = 0; j < j_values.size(); ++j)
{
CAPTURE(i)
CAPTURE(j)
CHECK((j_values[i] <=> j_values[j]) == expected[i][j]); // *NOPAD*
}
}
}
#endif
}
#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
SECTION("parser callback regression")
{
SECTION("filter specific element")
{
const auto* s_object = R"(
{
"foo": 2,
"bar": {
"baz": 1
}
}
)";
const auto* s_array = R"(
[1,2,[3,4,5],4,5]
)";
const json j_object = json::parse(s_object, [](int /*unused*/, json::parse_event_t /*unused*/, const json & j) noexcept
{
// filter all number(2) elements
return j != json(2);
});
CHECK (j_object == json({{"bar", {{"baz", 1}}}}));
const json j_array = json::parse(s_array, [](int /*unused*/, json::parse_event_t /*unused*/, const json & j) noexcept
{
return j != json(2);
});
CHECK (j_array == json({1, {3, 4, 5}, 4, 5}));
}
}
#endif
}
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
TEST_CASE("regression #3868 - heterogeneous comparisons compile under C++20 (P2468R2)")
{
// Issue #3868: operator!= was preventing compiler from synthesizing reversed
// operator== candidates under C++20's P2468R2 rewritten candidate rules.
// Verify that heterogeneous comparisons now work.
SECTION("string vs json")
{
std::string s = "string";
json j = "string";
CHECK(s == j);
CHECK(j == s);
CHECK_FALSE(s != j);
CHECK_FALSE(j != s);
}
SECTION("other heterogeneous types")
{
int i = 42;
json j = 42;
CHECK(i == j);
CHECK(j == i);
CHECK_FALSE(i != j);
CHECK_FALSE(j != i);
}
}
#endif
namespace
{
// orders keys ascending or descending, as chosen when a map is created
template<class Key>
class directed_less
{
public:
directed_less() = default;
explicit directed_less(const bool descending) noexcept
: m_descending(descending)
{}
bool operator()(const Key& lhs, const Key& rhs) const
{
return m_descending ? rhs < lhs : lhs < rhs;
}
private:
bool m_descending = false;
};
// An object type that, like std::unordered_map, enumerates its entries in no
// fixed order - ascending or descending by key, depending on how the map was
// created - and whose operator== does not depend on that order.
// std::unordered_map itself cannot be used here: the standard does not
// require it to accept an incomplete mapped type such as basic_json, and
// libstdc++ 6 to 9 as well as the EDG front ends of icpc and nvc++ reject
// basic_json<std::unordered_map>. std::map, the default object type, works
// with all supported compilers.
template<class Key, class Value, class /*Compare*/, class Allocator>
struct unordered_object_t : std::map<Key, Value, directed_less<Key>, Allocator>
{
using base_type = std::map<Key, Value, directed_less<Key>, Allocator>;
using base_type::base_type;
friend bool operator==(const unordered_object_t& lhs, const unordered_object_t& rhs)
{
return lhs.size() == rhs.size() && std::all_of(lhs.begin(), lhs.end(), [&rhs](const std::pair<const Key, Value>& entry)
{
const auto it = rhs.find(entry.first);
return it != rhs.end() && it->second == entry.second;
});
}
friend bool operator!=(const unordered_object_t& lhs, const unordered_object_t& rhs)
{
return !(lhs == rhs);
}
};
using unordered_json = nlohmann::basic_json<unordered_object_t>;
// the entries "0" to "9", enumerated in ascending or in descending order
unordered_json make_unordered_object(const bool descending)
{
unordered_json j = unordered_json::object_t(directed_less<std::string>(descending));
for (int i = 0; i < 10; ++i)
{
j[std::to_string(i)] = i;
}
return j;
}
template<typename Json>
Json nest(Json j, const std::size_t depth)
{
for (std::size_t i = 0; i < depth; ++i)
{
Json outer = Json::object();
outer["x"] = std::move(j);
j = std::move(outer);
}
return j;
}
// orders keys case-insensitively, so "key" and "KEY" compare equivalent
// (neither less than the other) although they are not equal
struct case_insensitive_less
{
bool operator()(const std::string& a, const std::string& b) const
{
return std::lexicographical_compare(a.begin(), a.end(), b.begin(), b.end(),
[](unsigned char x, unsigned char y)
{
return std::tolower(x) < std::tolower(y);
});
}
};
template<class Key, class Value, class /*Compare*/, class Allocator>
using case_insensitive_map = std::map<Key, Value, case_insensitive_less, Allocator>;
using ci_json = nlohmann::basic_json<case_insensitive_map>;
} // namespace
TEST_CASE("equality of objects whose entries have no fixed order")
{
// Values nested deeper than a bound are compared without the call stack,
// entry by entry. That must agree with the object type's own operator==,
// which for unordered_object_t (as for std::unordered_map) does not
// depend on the order of the entries, and for ordered_map does.
REQUIRE(make_unordered_object(true).begin().key() == "9");
REQUIRE(make_unordered_object(false).begin().key() == "0");
for (const std::size_t depth : std::vector<std::size_t> {0, 200})
{
CAPTURE(depth);
const unordered_json descending = nest(make_unordered_object(true), depth);
const unordered_json ascending = nest(make_unordered_object(false), depth);
CHECK(descending == ascending);
CHECK_FALSE(descending != ascending);
// a copy is equal to its original
const unordered_json copy = descending; // NOLINT(performance-unnecessary-copy-initialization)
CHECK(copy == descending);
// a different value, a different key, or another entry still count
unordered_json other_value = make_unordered_object(true);
other_value["5"] = 42;
CHECK_FALSE(nest(other_value, depth) == ascending);
unordered_json other_key = make_unordered_object(true);
other_key.erase("5");
other_key["50"] = 5;
CHECK_FALSE(nest(other_key, depth) == ascending);
unordered_json more_entries = make_unordered_object(true);
more_entries["10"] = 10;
CHECK_FALSE(nest(more_entries, depth) == ascending);
CHECK_FALSE(ascending == nest(more_entries, depth));
// ordered_json compares its entries in sequence
const nlohmann::ordered_json ab = nest(nlohmann::ordered_json({{"a", 1}, {"b", 2}}), depth);
const nlohmann::ordered_json ba = nest(nlohmann::ordered_json({{"b", 2}, {"a", 1}}), depth);
CHECK_FALSE(ab == ba);
CHECK(ab != ba);
}
}
TEST_CASE("equality of an object whose comparator treats different keys as equivalent")
{
// https://github.com/nlohmann/json/issues/5655: past the nesting bound,
// the entries are compared without the call stack, and a key that finds
// no counterpart at the same position is looked up with find(), which
// uses the object's own comparator. A case-insensitive comparator then
// finds "KEY" for "key" and must not accept that pair as a match - the
// object type's own operator==, like std::map's, compares keys with ==.
ci_json a = ci_json::object();
a["key"] = 1;
ci_json b = ci_json::object();
b["KEY"] = 1;
// sanity check: the object type's own comparison already disagrees
CHECK_FALSE(a.get_ref<const ci_json::object_t&>() == b.get_ref<const ci_json::object_t&>());
for (const std::size_t depth : std::vector<std::size_t> {0, 127, 128, 200})
{
CAPTURE(depth);
const ci_json x = nest(a, depth);
const ci_json y = nest(b, depth);
CHECK_FALSE(x == y);
CHECK(x != y);
}
}
TEST_CASE("containers are compared element by element")
{
// Containers nested deeper than a bound are compared without the call
// stack, by code of their own; every relation is checked both at the top
// level and below that bound.
const auto deep = [](const json & j, const std::size_t depth)
{
json result = j;
for (std::size_t i = 0; i < depth; ++i)
{
result = json::array({std::move(result)});
}
return result;
};
for (const std::size_t depth : std::vector<std::size_t> {0, 200})
{
CAPTURE(depth);
// objects with different keys
{
const json a = deep({{"a", 1}}, depth);
const json b = deep({{"b", 1}}, depth);
CHECK_FALSE(a == b);
CHECK(a != b);
CHECK(a < b);
CHECK(b > a);
CHECK_FALSE(b < a);
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
CHECK((a <=> b) == std::partial_ordering::less); // *NOPAD*
CHECK((b <=> a) == std::partial_ordering::greater); // *NOPAD*
CHECK((a <=> a) == std::partial_ordering::equivalent); // *NOPAD*
#endif
}
// a container that is a prefix of the other one
{
// the one that runs out of elements first is the smaller one
const json shorter = deep({1}, depth);
const json longer = deep({1, 2}, depth);
CHECK(shorter < longer);
CHECK(longer > shorter);
CHECK_FALSE(longer < shorter);
CHECK_FALSE(shorter == longer);
const json smaller_object = deep({{"a", 1}}, depth);
const json larger_object = deep({{"a", 1}, {"b", 2}}, depth);
CHECK(smaller_object < larger_object);
CHECK(larger_object > smaller_object);
CHECK_FALSE(smaller_object == larger_object);
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
CHECK((shorter <=> longer) == std::partial_ordering::less); // *NOPAD*
CHECK((longer <=> shorter) == std::partial_ordering::greater); // *NOPAD*
#endif
}
// elements that cannot be ordered
{
const double nan = std::numeric_limits<double>::quiet_NaN();
const json lhs = deep({nan, 1}, depth);
const json rhs = deep({nan, 2}, depth);
CHECK_FALSE(lhs == lhs);
CHECK_FALSE(rhs < lhs);
#if JSON_HAS_THREE_WAY_COMPARISON
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
// operator<=> stops there, as std::lexicographical_compare_three_way
// does, and operator< is derived from it
CHECK((lhs <=> rhs) == std::partial_ordering::unordered); // *NOPAD*
CHECK_FALSE(lhs < rhs);
#else
// operator< skips a pair of elements that cannot be ordered, as
// std::lexicographical_compare does, and the next pair decides
CHECK(lhs < rhs);
#endif
}
}
}
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