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-rw-r--r--json4cpp/tests/src/unit-items.cpp1433
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diff --git a/json4cpp/tests/src/unit-items.cpp b/json4cpp/tests/src/unit-items.cpp
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+// __ _____ _____ _____
+// __| | __| | | | JSON for Modern C++ (supporting code)
+// | | |__ | | | | | | version 3.12.0
+// |_____|_____|_____|_|___| https://github.com/nlohmann/json
+//
+// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
+// SPDX-License-Identifier: MIT
+
+#include "doctest_compatibility.h"
+
+#include <nlohmann/json.hpp>
+using nlohmann::json;
+
+// This test suite uses range for loops where values are copied. This is inefficient in usual code, but required to achieve 100% coverage.
+DOCTEST_GCC_SUPPRESS_WARNING_PUSH
+#if DOCTEST_GCC >= DOCTEST_COMPILER(11, 0, 0)
+ DOCTEST_GCC_SUPPRESS_WARNING("-Wrange-loop-construct")
+#endif
+DOCTEST_CLANG_SUPPRESS_WARNING_PUSH
+DOCTEST_CLANG_SUPPRESS_WARNING("-Wrange-loop-construct")
+
+TEST_CASE("iterator_wrapper")
+{
+ SECTION("object")
+ {
+ SECTION("value")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto& i : json::iterator_wrapper(j)) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+
+ // change the value
+ i.value() = json(11);
+ CHECK(i.value() == json(11));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+
+ // change the value
+ i.value() = json(22);
+ CHECK(i.value() == json(22));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+
+ // check if values where changed
+ CHECK(j == json({ {"A", 11}, {"B", 22} }));
+ }
+
+ SECTION("const value")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto& i : json::iterator_wrapper(j))
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+ }
+
+ SECTION("const object")
+ {
+ SECTION("value")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto& i : json::iterator_wrapper(j)) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const value")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto& i : json::iterator_wrapper(j))
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+ }
+
+ SECTION("array")
+ {
+ SECTION("value")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto& i : json::iterator_wrapper(j)) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+
+ // change the value
+ i.value() = "AA";
+ CHECK(i.value() == "AA");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+
+ // change the value
+ i.value() = "BB";
+ CHECK(i.value() == "BB");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+
+ // check if values where changed
+ CHECK(j == json({ "AA", "BB" }));
+ }
+
+ SECTION("const value")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto& i : json::iterator_wrapper(j))
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+ }
+
+ SECTION("const array")
+ {
+ SECTION("value")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto& i : json::iterator_wrapper(j)) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const value")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto& i : json::iterator_wrapper(j))
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+ }
+
+ SECTION("primitive")
+ {
+ SECTION("value")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("reference")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (auto& i : json::iterator_wrapper(j)) // NOLINT(readability-qualified-auto)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+
+ // change value
+ i.value() = json(2);
+ }
+
+ CHECK(counter == 2);
+
+ // check if value has changed
+ CHECK(j == json(2));
+ }
+
+ SECTION("const value")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (const auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("const reference")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (const auto& i : json::iterator_wrapper(j))
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+ }
+
+ SECTION("const primitive")
+ {
+ SECTION("value")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("reference")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (auto& i : json::iterator_wrapper(j)) // NOLINT(readability-qualified-auto)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("const value")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (const auto i : json::iterator_wrapper(j)) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("const reference")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (const auto& i : json::iterator_wrapper(j))
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+ }
+}
+
+TEST_CASE("items()")
+{
+ SECTION("object")
+ {
+ SECTION("value")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto& i : j.items()) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+
+ // change the value
+ i.value() = json(11);
+ CHECK(i.value() == json(11));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+
+ // change the value
+ i.value() = json(22);
+ CHECK(i.value() == json(22));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+
+ // check if values where changed
+ CHECK(j == json({ {"A", 11}, {"B", 22} }));
+ }
+
+ SECTION("const value")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto& i : j.items())
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+#ifdef JSON_HAS_CPP_17
+ SECTION("structured bindings")
+ {
+ json j = { {"A", 1}, {"B", 2} };
+
+ std::map<std::string, int> m;
+
+ for (auto const&[key, value] : j.items())
+ {
+ m.emplace(key, value);
+ }
+
+ CHECK(j.get<decltype(m)>() == m);
+ }
+#endif
+ }
+
+ SECTION("const object")
+ {
+ SECTION("value")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (auto& i : j.items()) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const value")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ const json j = { {"A", 1}, {"B", 2} };
+ int counter = 1;
+
+ for (const auto& i : j.items())
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "A");
+ CHECK(i.value() == json(1));
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "B");
+ CHECK(i.value() == json(2));
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+ }
+
+ SECTION("array")
+ {
+ SECTION("value")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto& i : j.items()) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+
+ // change the value
+ i.value() = "AA";
+ CHECK(i.value() == "AA");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+
+ // change the value
+ i.value() = "BB";
+ CHECK(i.value() == "BB");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+
+ // check if values where changed
+ CHECK(j == json({ "AA", "BB" }));
+ }
+
+ SECTION("const value")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto& i : j.items())
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+ }
+
+ SECTION("const array")
+ {
+ SECTION("value")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("reference")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (auto& i : j.items()) // NOLINT(readability-qualified-auto)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const value")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+
+ SECTION("const reference")
+ {
+ const json j = { "A", "B" };
+ int counter = 1;
+
+ for (const auto& i : j.items())
+ {
+ switch (counter++)
+ {
+ case 1:
+ {
+ CHECK(i.key() == "0");
+ CHECK(i.value() == "A");
+ break;
+ }
+
+ case 2:
+ {
+ CHECK(i.key() == "1");
+ CHECK(i.value() == "B");
+ break;
+ }
+
+ default:
+ {
+ break;
+ }
+ }
+ }
+
+ CHECK(counter == 3);
+ }
+ }
+
+ SECTION("primitive")
+ {
+ SECTION("value")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("reference")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (auto& i : j.items()) // NOLINT(readability-qualified-auto)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+
+ // change value
+ i.value() = json(2);
+ }
+
+ CHECK(counter == 2);
+
+ // check if value has changed
+ CHECK(j == json(2));
+ }
+
+ SECTION("const value")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (const auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("const reference")
+ {
+ json j = 1;
+ int counter = 1;
+
+ for (const auto& i : j.items())
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+ }
+
+ SECTION("const primitive")
+ {
+ SECTION("value")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("reference")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (auto& i : j.items()) // NOLINT(readability-qualified-auto)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("const value")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (const auto i : j.items()) // NOLINT(performance-for-range-copy)
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+
+ SECTION("const reference")
+ {
+ const json j = 1;
+ int counter = 1;
+
+ for (const auto& i : j.items())
+ {
+ ++counter;
+ CHECK(i.key() == "");
+ CHECK(i.value() == json(1));
+ }
+
+ CHECK(counter == 2);
+ }
+ }
+}
+
+DOCTEST_GCC_SUPPRESS_WARNING_POP
+DOCTEST_CLANG_SUPPRESS_WARNING_POP
generated by cgit 0.0.5-2-1-g0f52 (git 2.46.0) at 2026-04-05 22:10:33 +0000