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Diffstat (limited to 'json4cpp/tests/src/unit-iterators2.cpp')
| -rw-r--r-- | json4cpp/tests/src/unit-iterators2.cpp | 972 |
1 files changed, 972 insertions, 0 deletions
diff --git a/json4cpp/tests/src/unit-iterators2.cpp b/json4cpp/tests/src/unit-iterators2.cpp new file mode 100644 index 0000000000..ee9d15c6f2 --- /dev/null +++ b/json4cpp/tests/src/unit-iterators2.cpp @@ -0,0 +1,972 @@ +// __ _____ _____ _____ +// __| | __| | | | 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 <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"}; + + // NOLINTNEXTLINE(fuchsia-trailing-return) + auto transformed = j.items() | std::views::transform([](const auto & item) -> std::string_view + { + return item.key(); + }); + auto j_transformed = json::array(); + std::ranges::copy(transformed, std::back_inserter(j_transformed)); + + CHECK(j_transformed == j_expected); + } + } +#endif + } +#endif +} |