Use the with_*_t aliases in tests, examples, and docs (#5787)

* Use the with_*_t aliases in tests, examples, and docs

Replace spelled-out basic_json<...> instantiations that only change one
or two template parameters with nlohmann::json::with_*_t (or
ordered_json::with_*_t when the object type is ordered_map). Types that
change all three number types chain with_integers_t and with_float_t.

The raw basic_json<...> spelling stays where the template parameter
list itself is the subject: the alias tests in unit-udt.cpp, explicit
instantiations, and the ordered_json/compile-time docs.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Fix unit-large_json for clang and JSON_DIAGNOSTICS

Two test problems from #5781 broke CI on develop: CAPTURE(depth); trips
clang's -Wextra-semi-stmt, and the type_error.321 messages did not
account for the diagnostics path prefix.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Use static_cast in unit-hash for clang-tidy

#5772 added functional casts that clang-tidy reports as C-style casts
(google-readability-casting). Also append a char instead of a
one-character string in unit-large_json.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* Declare the expected message prefix const in unit-large_json

Without JSON_DIAGNOSTICS the prefix was never modified, which
clang-tidy reports (misc-const-correctness).

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann authored and GitHub committed 2026-10-08 16:11:16 +02:00
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commit 3d7f554927
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@@ -172,7 +172,7 @@ TEST_CASE("locale-dependent test (LC_NUMERIC=de_DE)")
// a floating-point type that is not a float or a double is written
// with snprintf, whose locale-specific decimal point and thousands
// separator are undone afterwards
using long_double_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, long double>;
using long_double_json = nlohmann::json::with_float_t<long double>;
CHECK(long_double_json(12345.5L).dump() == "12345.5");
CHECK(long_double_json(1.0L).dump() == "1.0");
CHECK(long_double_json(-0.25L).dump() == "-0.25");
@@ -272,7 +272,7 @@ TEST_CASE("locale changes between lexer construction and number conversion (#519
}
text += "]";
using long_double_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, long double>;
using long_double_json = nlohmann::json::with_float_t<long double>;
// reference values, parsed without a locale switch
REQUIRE(std::setlocale(LC_NUMERIC, "C") != nullptr);
@@ -432,7 +432,7 @@ TEST_CASE("locale changes during a single dump() (#5709 item 3)")
// long double on 64-bit Arm, where it is IEEE-754 double) takes the
// locale-independent to_chars() path instead, and this test is a no-op
// there.
using long_double_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, long double>;
using long_double_json = nlohmann::json::with_float_t<long double>;
using ld_limits = std::numeric_limits<long_double_json::number_float_t>;
const bool is_ieee_single_or_double =
(ld_limits::is_iec559 && ld_limits::digits == 24 && ld_limits::max_exponent == 128) ||