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unit-iterators2.cpp
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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.11.2
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2022 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 <nlohmann/json.hpp>
using nlohmann::json;
#if JSON_HAS_RANGES
#include <algorithm>
#include <ranges>
#endif
TEST_CASE("iterators 2")
{
SECTION("iterator comparisons")
{
json j_values = {nullptr, true, 42, 42u, 23.23, {{"one", 1}, {"two", 2}}, {1, 2, 3, 4, 5}, "Hello, world"};
for (json& j : j_values)
{
auto it1 = j.begin();
auto it2 = j.begin();
auto it3 = j.begin();
++it2;
++it3;
++it3;
auto it1_c = j.cbegin();
auto it2_c = j.cbegin();
auto it3_c = j.cbegin();
++it2_c;
++it3_c;
++it3_c;
// comparison: equal
{
CHECK(it1 == it1);
CHECK(!(it1 == it2));
CHECK(!(it1 == it3));
CHECK(!(it2 == it3));
CHECK(it1_c == it1_c);
CHECK(!(it1_c == it2_c));
CHECK(!(it1_c == it3_c));
CHECK(!(it2_c == it3_c));
}
// comparison: not equal
{
// check definition
CHECK( (it1 != it1) == !(it1 == it1) );
CHECK( (it1 != it2) == !(it1 == it2) );
CHECK( (it1 != it3) == !(it1 == it3) );
CHECK( (it2 != it3) == !(it2 == it3) );
CHECK( (it1_c != it1_c) == !(it1_c == it1_c) );
CHECK( (it1_c != it2_c) == !(it1_c == it2_c) );
CHECK( (it1_c != it3_c) == !(it1_c == it3_c) );
CHECK( (it2_c != it3_c) == !(it2_c == it3_c) );
}
// comparison: smaller
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 < it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 < it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c < it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 < it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 < it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c < it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
CHECK(!(it1 < it1));
CHECK(it1 < it2);
CHECK(it1 < it3);
CHECK(it2 < it3);
CHECK(!(it1_c < it1_c));
CHECK(it1_c < it2_c);
CHECK(it1_c < it3_c);
CHECK(it2_c < it3_c);
}
}
// comparison: less than or equal
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 <= it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 <= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c <= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 <= it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 <= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c <= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
// check definition
CHECK( (it1 <= it1) == !(it1 < it1) );
CHECK( (it1 <= it2) == !(it2 < it1) );
CHECK( (it1 <= it3) == !(it3 < it1) );
CHECK( (it2 <= it3) == !(it3 < it2) );
CHECK( (it1_c <= it1_c) == !(it1_c < it1_c) );
CHECK( (it1_c <= it2_c) == !(it2_c < it1_c) );
CHECK( (it1_c <= it3_c) == !(it3_c < it1_c) );
CHECK( (it2_c <= it3_c) == !(it3_c < it2_c) );
}
}
// comparison: greater than
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 > it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 > it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c > it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 > it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 > it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c > it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
// check definition
CHECK( (it1 > it1) == (it1 < it1) );
CHECK( (it1 > it2) == (it2 < it1) );
CHECK( (it1 > it3) == (it3 < it1) );
CHECK( (it2 > it3) == (it3 < it2) );
CHECK( (it1_c > it1_c) == (it1_c < it1_c) );
CHECK( (it1_c > it2_c) == (it2_c < it1_c) );
CHECK( (it1_c > it3_c) == (it3_c < it1_c) );
CHECK( (it2_c > it3_c) == (it3_c < it2_c) );
}
}
// comparison: greater than or equal
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 >= it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 >= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c >= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 >= it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 >= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c >= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
// check definition
CHECK( (it1 >= it1) == !(it1 < it1) );
CHECK( (it1 >= it2) == !(it1 < it2) );
CHECK( (it1 >= it3) == !(it1 < it3) );
CHECK( (it2 >= it3) == !(it2 < it3) );
CHECK( (it1_c >= it1_c) == !(it1_c < it1_c) );
CHECK( (it1_c >= it2_c) == !(it1_c < it2_c) );
CHECK( (it1_c >= it3_c) == !(it1_c < it3_c) );
CHECK( (it2_c >= it3_c) == !(it2_c < it3_c) );
}
}
}
// check exceptions if different objects are compared
for (auto j : j_values)
{
for (auto k : j_values)
{
if (j != k)
{
#if JSON_DIAGNOSTICS
// the output differs in each loop, so we cannot fix a string for the expected exception
#else
CHECK_THROWS_WITH_AS(j.begin() == k.begin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(j.cbegin() == k.cbegin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(j.begin() < k.begin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(j.cbegin() < k.cbegin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
#endif
}
}
}
}
SECTION("iterator arithmetic")
{
json j_object = {{"one", 1}, {"two", 2}, {"three", 3}};
json j_array = {1, 2, 3, 4, 5, 6};
json j_null = nullptr;
json j_value = 42;
SECTION("addition and subtraction")
{
SECTION("object")
{
{
auto it = j_object.begin();
CHECK_THROWS_WITH_AS(it += 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.cbegin();
CHECK_THROWS_WITH_AS(it += 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.begin();
CHECK_THROWS_WITH_AS(it + 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.cbegin();
CHECK_THROWS_WITH_AS(it + 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.begin();
CHECK_THROWS_WITH_AS(1 + it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.cbegin();
CHECK_THROWS_WITH_AS(1 + it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.begin();
CHECK_THROWS_WITH_AS(it -= 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.cbegin();
CHECK_THROWS_WITH_AS(it -= 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.begin();
CHECK_THROWS_WITH_AS(it - 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.cbegin();
CHECK_THROWS_WITH_AS(it - 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.begin();
CHECK_THROWS_WITH_AS(it - it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.cbegin();
CHECK_THROWS_WITH_AS(it - it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
}
SECTION("array")
{
{
auto it = j_array.begin();
it += 3;
CHECK((j_array.begin() + 3) == it);
CHECK((3 + j_array.begin()) == it);
CHECK((it - 3) == j_array.begin());
CHECK((it - j_array.begin()) == 3);
CHECK(*it == json(4));
it -= 2;
CHECK(*it == json(2));
}
{
auto it = j_array.cbegin();
it += 3;
CHECK((j_array.cbegin() + 3) == it);
CHECK((3 + j_array.cbegin()) == it);
CHECK((it - 3) == j_array.cbegin());
CHECK((it - j_array.cbegin()) == 3);
CHECK(*it == json(4));
it -= 2;
CHECK(*it == json(2));
}
}
SECTION("null")
{
{
auto it = j_null.begin();
it += 3;
CHECK((j_null.begin() + 3) == it);
CHECK((3 + j_null.begin()) == it);
CHECK((it - 3) == j_null.begin());
CHECK((it - j_null.begin()) == 3);
CHECK(it != j_null.end());
it -= 3;
CHECK(it == j_null.end());
}
{
auto it = j_null.cbegin();
it += 3;
CHECK((j_null.cbegin() + 3) == it);
CHECK((3 + j_null.cbegin()) == it);
CHECK((it - 3) == j_null.cbegin());
CHECK((it - j_null.cbegin()) == 3);
CHECK(it != j_null.cend());
it -= 3;
CHECK(it == j_null.cend());
}
}
SECTION("value")
{
{
auto it = j_value.begin();
it += 3;
CHECK((j_value.begin() + 3) == it);
CHECK((3 + j_value.begin()) == it);
CHECK((it - 3) == j_value.begin());
CHECK((it - j_value.begin()) == 3);
CHECK(it != j_value.end());
it -= 3;
CHECK(*it == json(42));
}
{
auto it = j_value.cbegin();
it += 3;
CHECK((j_value.cbegin() + 3) == it);
CHECK((3 + j_value.cbegin()) == it);
CHECK((it - 3) == j_value.cbegin());
CHECK((it - j_value.cbegin()) == 3);
CHECK(it != j_value.cend());
it -= 3;
CHECK(*it == json(42));
}
}
}
SECTION("subscript operator")
{
SECTION("object")
{
{
auto it = j_object.begin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.208] cannot use operator[] for object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.208] cannot use operator[] for object iterators", json::invalid_iterator&);
}
{
auto it = j_object.cbegin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.208] cannot use operator[] for object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.208] cannot use operator[] for object iterators", json::invalid_iterator&);
}
}
SECTION("array")
{
{
auto it = j_array.begin();
CHECK(it[0] == json(1));
CHECK(it[1] == json(2));
CHECK(it[2] == json(3));
CHECK(it[3] == json(4));
CHECK(it[4] == json(5));
CHECK(it[5] == json(6));
}
{
auto it = j_array.cbegin();
CHECK(it[0] == json(1));
CHECK(it[1] == json(2));
CHECK(it[2] == json(3));
CHECK(it[3] == json(4));
CHECK(it[4] == json(5));
CHECK(it[5] == json(6));
}
}
SECTION("null")
{
{
auto it = j_null.begin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
{
auto it = j_null.cbegin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
}
SECTION("value")
{
{
auto it = j_value.begin();
CHECK(it[0] == json(42));
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
{
auto it = j_value.cbegin();
CHECK(it[0] == json(42));
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
}
}
}
SECTION("reverse iterator comparisons")
{
json j_values = {nullptr, true, 42, 42u, 23.23, {{"one", 1}, {"two", 2}}, {1, 2, 3, 4, 5}, "Hello, world"};
for (json& j : j_values)
{
auto it1 = j.rbegin();
auto it2 = j.rbegin();
auto it3 = j.rbegin();
++it2;
++it3;
++it3;
auto it1_c = j.crbegin();
auto it2_c = j.crbegin();
auto it3_c = j.crbegin();
++it2_c;
++it3_c;
++it3_c;
// comparison: equal
{
CHECK(it1 == it1);
CHECK(!(it1 == it2));
CHECK(!(it1 == it3));
CHECK(!(it2 == it3));
CHECK(it1_c == it1_c);
CHECK(!(it1_c == it2_c));
CHECK(!(it1_c == it3_c));
CHECK(!(it2_c == it3_c));
}
// comparison: not equal
{
// check definition
CHECK( (it1 != it1) == !(it1 == it1) );
CHECK( (it1 != it2) == !(it1 == it2) );
CHECK( (it1 != it3) == !(it1 == it3) );
CHECK( (it2 != it3) == !(it2 == it3) );
CHECK( (it1_c != it1_c) == !(it1_c == it1_c) );
CHECK( (it1_c != it2_c) == !(it1_c == it2_c) );
CHECK( (it1_c != it3_c) == !(it1_c == it3_c) );
CHECK( (it2_c != it3_c) == !(it2_c == it3_c) );
}
// comparison: smaller
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 < it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 < it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c < it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 < it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 < it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 < it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c < it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c < it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
CHECK(!(it1 < it1));
CHECK(it1 < it2);
CHECK(it1 < it3);
CHECK(it2 < it3);
CHECK(!(it1_c < it1_c));
CHECK(it1_c < it2_c);
CHECK(it1_c < it3_c);
CHECK(it2_c < it3_c);
}
}
// comparison: less than or equal
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 <= it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 <= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c <= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 <= it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 <= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 <= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c <= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c <= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
// check definition
CHECK( (it1 <= it1) == !(it1 < it1) );
CHECK( (it1 <= it2) == !(it2 < it1) );
CHECK( (it1 <= it3) == !(it3 < it1) );
CHECK( (it2 <= it3) == !(it3 < it2) );
CHECK( (it1_c <= it1_c) == !(it1_c < it1_c) );
CHECK( (it1_c <= it2_c) == !(it2_c < it1_c) );
CHECK( (it1_c <= it3_c) == !(it3_c < it1_c) );
CHECK( (it2_c <= it3_c) == !(it3_c < it2_c) );
}
}
// comparison: greater than
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 > it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 > it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c > it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 > it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 > it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 > it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c > it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c > it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
// check definition
CHECK( (it1 > it1) == (it1 < it1) );
CHECK( (it1 > it2) == (it2 < it1) );
CHECK( (it1 > it3) == (it3 < it1) );
CHECK( (it2 > it3) == (it3 < it2) );
CHECK( (it1_c > it1_c) == (it1_c < it1_c) );
CHECK( (it1_c > it2_c) == (it2_c < it1_c) );
CHECK( (it1_c > it3_c) == (it3_c < it1_c) );
CHECK( (it2_c > it3_c) == (it3_c < it2_c) );
}
}
// comparison: greater than or equal
{
if (j.type() == json::value_t::object)
{
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(it1 >= it1, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it2, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 >= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it3, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it1_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it2_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c >= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it3_c, "[json.exception.invalid_iterator.213] (/5) cannot compare order of object iterators", json::invalid_iterator&);
#else
CHECK_THROWS_WITH_AS(it1 >= it1, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it2, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2 >= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1 >= it3, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it1_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it2_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it2_c >= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it1_c >= it3_c, "[json.exception.invalid_iterator.213] cannot compare order of object iterators", json::invalid_iterator&);
#endif
}
else
{
// check definition
CHECK( (it1 >= it1) == !(it1 < it1) );
CHECK( (it1 >= it2) == !(it1 < it2) );
CHECK( (it1 >= it3) == !(it1 < it3) );
CHECK( (it2 >= it3) == !(it2 < it3) );
CHECK( (it1_c >= it1_c) == !(it1_c < it1_c) );
CHECK( (it1_c >= it2_c) == !(it1_c < it2_c) );
CHECK( (it1_c >= it3_c) == !(it1_c < it3_c) );
CHECK( (it2_c >= it3_c) == !(it2_c < it3_c) );
}
}
}
// check exceptions if different objects are compared
for (auto j : j_values)
{
for (auto k : j_values)
{
if (j != k)
{
#if JSON_DIAGNOSTICS
// the output differs in each loop, so we cannot fix a string for the expected exception
#else
CHECK_THROWS_WITH_AS(j.rbegin() == k.rbegin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(j.crbegin() == k.crbegin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(j.rbegin() < k.rbegin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(j.crbegin() < k.crbegin(), "[json.exception.invalid_iterator.212] cannot compare iterators of different containers", json::invalid_iterator&);
#endif
}
}
}
}
SECTION("reverse iterator arithmetic")
{
json j_object = {{"one", 1}, {"two", 2}, {"three", 3}};
json j_array = {1, 2, 3, 4, 5, 6};
json j_null = nullptr;
json j_value = 42;
SECTION("addition and subtraction")
{
SECTION("object")
{
{
auto it = j_object.rbegin();
CHECK_THROWS_WITH_AS(it += 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.crbegin();
CHECK_THROWS_WITH_AS(it += 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.rbegin();
CHECK_THROWS_WITH_AS(it + 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.crbegin();
CHECK_THROWS_WITH_AS(it + 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.rbegin();
CHECK_THROWS_WITH_AS(1 + it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.crbegin();
CHECK_THROWS_WITH_AS(1 + it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.rbegin();
CHECK_THROWS_WITH_AS(it -= 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.crbegin();
CHECK_THROWS_WITH_AS(it -= 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.rbegin();
CHECK_THROWS_WITH_AS(it - 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.crbegin();
CHECK_THROWS_WITH_AS(it - 1, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.rbegin();
CHECK_THROWS_WITH_AS(it - it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.crbegin();
CHECK_THROWS_WITH_AS(it - it, "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
}
SECTION("array")
{
{
auto it = j_array.rbegin();
it += 3;
CHECK((j_array.rbegin() + 3) == it);
CHECK(json::reverse_iterator(3 + j_array.rbegin()) == it);
CHECK((it - 3) == j_array.rbegin());
CHECK((it - j_array.rbegin()) == 3);
CHECK(*it == json(3));
it -= 2;
CHECK(*it == json(5));
}
{
auto it = j_array.crbegin();
it += 3;
CHECK((j_array.crbegin() + 3) == it);
CHECK(json::const_reverse_iterator(3 + j_array.crbegin()) == it);
CHECK((it - 3) == j_array.crbegin());
CHECK((it - j_array.crbegin()) == 3);
CHECK(*it == json(3));
it -= 2;
CHECK(*it == json(5));
}
}
SECTION("null")
{
{
auto it = j_null.rbegin();
it += 3;
CHECK((j_null.rbegin() + 3) == it);
CHECK(json::reverse_iterator(3 + j_null.rbegin()) == it);
CHECK((it - 3) == j_null.rbegin());
CHECK((it - j_null.rbegin()) == 3);
CHECK(it != j_null.rend());
it -= 3;
CHECK(it == j_null.rend());
}
{
auto it = j_null.crbegin();
it += 3;
CHECK((j_null.crbegin() + 3) == it);
CHECK(json::const_reverse_iterator(3 + j_null.crbegin()) == it);
CHECK((it - 3) == j_null.crbegin());
CHECK((it - j_null.crbegin()) == 3);
CHECK(it != j_null.crend());
it -= 3;
CHECK(it == j_null.crend());
}
}
SECTION("value")
{
{
auto it = j_value.rbegin();
it += 3;
CHECK((j_value.rbegin() + 3) == it);
CHECK(json::reverse_iterator(3 + j_value.rbegin()) == it);
CHECK((it - 3) == j_value.rbegin());
CHECK((it - j_value.rbegin()) == 3);
CHECK(it != j_value.rend());
it -= 3;
CHECK(*it == json(42));
}
{
auto it = j_value.crbegin();
it += 3;
CHECK((j_value.crbegin() + 3) == it);
CHECK(json::const_reverse_iterator(3 + j_value.crbegin()) == it);
CHECK((it - 3) == j_value.crbegin());
CHECK((it - j_value.crbegin()) == 3);
CHECK(it != j_value.crend());
it -= 3;
CHECK(*it == json(42));
}
}
}
SECTION("subscript operator")
{
SECTION("object")
{
{
auto it = j_object.rbegin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
{
auto it = j_object.crbegin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.209] cannot use offsets with object iterators", json::invalid_iterator&);
}
}
SECTION("array")
{
{
auto it = j_array.rbegin();
CHECK(it[0] == json(6));
CHECK(it[1] == json(5));
CHECK(it[2] == json(4));
CHECK(it[3] == json(3));
CHECK(it[4] == json(2));
CHECK(it[5] == json(1));
}
{
auto it = j_array.crbegin();
CHECK(it[0] == json(6));
CHECK(it[1] == json(5));
CHECK(it[2] == json(4));
CHECK(it[3] == json(3));
CHECK(it[4] == json(2));
CHECK(it[5] == json(1));
}
}
SECTION("null")
{
{
auto it = j_null.rbegin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
{
auto it = j_null.crbegin();
CHECK_THROWS_WITH_AS(it[0], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
}
SECTION("value")
{
{
auto it = j_value.rbegin();
CHECK(it[0] == json(42));
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
{
auto it = j_value.crbegin();
CHECK(it[0] == json(42));
CHECK_THROWS_WITH_AS(it[1], "[json.exception.invalid_iterator.214] cannot get value", json::invalid_iterator&);
}
}
}
}
#if JSON_HAS_RANGES
// JSON_HAS_CPP_20 (do not remove; see note at top of file)
SECTION("ranges")
{
SECTION("concepts")
{
using nlohmann::detail::iteration_proxy_value;
CHECK(std::bidirectional_iterator<json::iterator>);
CHECK(std::input_iterator<iteration_proxy_value<json::iterator>>);
CHECK(std::is_same<json::iterator, std::ranges::iterator_t<json>>::value);
CHECK(std::ranges::bidirectional_range<json>);
using nlohmann::detail::iteration_proxy;
using items_type = decltype(std::declval<json&>().items());
CHECK(std::is_same<items_type, iteration_proxy<json::iterator>>::value);
CHECK(std::is_same<iteration_proxy_value<json::iterator>, std::ranges::iterator_t<items_type>>::value);
CHECK(std::ranges::input_range<items_type>);
}
// libstdc++ algorithms don't work with Clang 15 (04/2022)
#if !DOCTEST_CLANG || (DOCTEST_CLANG && defined(__GLIBCXX__))
SECTION("algorithms")
{
SECTION("copy")
{
json j{"foo", "bar"};
auto j_copied = json::array();
std::ranges::copy(j, std::back_inserter(j_copied));
CHECK(j == j_copied);
}
SECTION("find_if")
{
json j{1, 3, 2, 4};
auto j_even = json::array();
#if JSON_USE_IMPLICIT_CONVERSIONS
auto it = std::ranges::find_if(j, [](int v) noexcept
{
return (v % 2) == 0;
});
#else
auto it = std::ranges::find_if(j, [](const json & j) noexcept
{
int v;
j.get_to(v);
return (v % 2) == 0;
});
#endif
CHECK(*it == 2);
}
}
#endif
// libstdc++ views don't work with Clang 15 (04/2022)
// libc++ hides limited ranges implementation behind guard macro
#if !(DOCTEST_CLANG && (defined(__GLIBCXX__) || defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)))
SECTION("views")
{
SECTION("reverse")
{
json j{1, 2, 3, 4, 5};
json j_expected{5, 4, 3, 2, 1};
auto reversed = j | std::views::reverse;
CHECK(std::ranges::equal(reversed, j_expected));
}
SECTION("transform")
{
json j
{
{ "a_key", "a_value"},
{ "b_key", "b_value"},
{ "c_key", "c_value"},
};
json j_expected{"a_key", "b_key", "c_key"};
auto transformed = j.items() | std::views::transform([](const auto & item)
{
return item.key();
});
auto j_transformed = json::array();
std::ranges::copy(transformed, std::back_inserter(j_transformed));
CHECK(j_transformed == j_expected);
}
}
#endif
}
#endif
}