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Add tests for the with_*_t member alias templates

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Check with std::is_same that each with_*_t alias produces the expected
basic_json type, and that with_string_t keeps nlohmann::ordered_map as
the object type when used on ordered_json.

Co-authored-by: Raphael Grimm <1005058+barcode@users.noreply.github.com>
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-10-04 18:10:17 +02:00
co-authored by Raphael Grimm
parent 7e4b496811
commit ea72ffe0a3
1 changed files with 63 additions and 0 deletions
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tests/src/unit-udt.cpp
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@@ -23,6 +23,7 @@ using nlohmann::json;
using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
#endif
#include <deque>
#include <map>
#include <memory>
#include <string>
@@ -733,6 +734,68 @@ TEST_CASE("custom serializer that does adl by default" * doctest::test_suite("ud
CHECK(me == cj.get<udt::person>());
}
TEST_CASE("with_*_t aliases" * doctest::test_suite("udt"))
{
// a custom base class used to check with_base_class_t
struct custom_base_class {};
CHECK(std::is_same<json::with_object_t<std::deque>,
nlohmann::basic_json<std::deque, std::vector, std::string, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_array_t<std::deque>,
nlohmann::basic_json<std::map, std::deque, std::string, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_string_t<std::wstring>,
nlohmann::basic_json<std::map, std::vector, std::wstring, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_boolean_t<int>,
nlohmann::basic_json<std::map, std::vector, std::string, int,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_integers_t<std::int32_t, std::uint32_t>,
nlohmann::basic_json<std::map, std::vector, std::string, bool,
std::int32_t, std::uint32_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_float_t<float>,
nlohmann::basic_json<std::map, std::vector, std::string, bool,
std::int64_t, std::uint64_t, float, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_allocator_t<std::allocator>,
nlohmann::basic_json<std::map, std::vector, std::string, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_json_serializer_t<nlohmann::adl_serializer>,
nlohmann::basic_json<std::map, std::vector, std::string, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
CHECK(std::is_same<json::with_binary_t<std::vector<char>>,
nlohmann::basic_json<std::map, std::vector, std::string, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<char>>>::value);
CHECK(std::is_same<json::with_base_class_t<custom_base_class>,
nlohmann::basic_json<std::map, std::vector, std::string, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>, custom_base_class>>::value);
// with_string_t on ordered_json must keep ordered_map as the object type
CHECK(std::is_same<nlohmann::ordered_json::with_string_t<std::wstring>,
nlohmann::basic_json<nlohmann::ordered_map, std::vector, std::wstring, bool,
std::int64_t, std::uint64_t, double, std::allocator,
nlohmann::adl_serializer, std::vector<std::uint8_t>>>::value);
}
TEST_CASE("different basic_json types conversions")
{
SECTION("null")