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json_view: get<T>() of a boolean throws for the exact number types, as basic_json does (#5992)

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* json_view: get<T>() of a boolean throws for number_integer_t, number_unsigned_t and number_float_t like basic_json (#5988)

basic_json::get<T>() of a boolean throws type_error.302 for exactly
number_integer_t, number_unsigned_t and number_float_t (dedicated from_json()
overloads) and gives 0/1 for every other arithmetic type. The view returned
0/1 for all of them, contradicting its documentation. The view now throws
the same exception (same message, with path/bytes decoration) for these three
types. basic_json is unchanged; its behavior is documented and pinned by a test.

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

* tests: skip throwing json_view bool get<T>() combinations without exceptions (#5988)

check_boolean_get_parity() called get<T>() for number_integer_t,
number_unsigned_t and number_float_t in its JSON_NOEXCEPTION branch, but a
boolean throws type_error.302 for exactly these types, so JSON_THROW aborted
test-json_view_cpp11/cpp17 in ci_test_noexceptions. Skip these combinations
there; the throwing checks stay in the exceptions-enabled build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N5NasAgbDGG28MqXjQvLqp
Signed-off-by: Claude <noreply@anthropic.com>

* Expect the byte range of the root in the json_view boolean get<T>() test

With JSON_DIAGNOSTIC_POSITIONS, the type_error.302 message starts with
"(bytes 0-4)"; build the expected text with json_view_test::message(),
as the other tests of the root value do.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N5NasAgbDGG28MqXjQvLqp
Signed-off-by: Claude <noreply@anthropic.com>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Signed-off-by: Claude <noreply@anthropic.com>
Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Niels LohmannandClaude Opus 5.5 authored and GitHub committed 2026-11-02 17:48:43 +01:00
1 parent 494a74c242
commit bfe69c73c2
6 files changed
+185 -7
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tests/src/unit-conversions1.cpp
+38
View File
@@ -1260,6 +1260,44 @@ TEST_CASE("value conversion")
#undef JSON_HAS_CPP_17
#endif
TEST_CASE("get<T>() of a boolean (#5988)")
{
// a boolean converts to 0/1 for every arithmetic type except number_integer_t, number_unsigned_t and
// number_float_t, whose dedicated from_json() overloads throw
const json t = true;
const json f = false;
SECTION("0 and 1")
{
// long and unsigned long are left out: they are std::int64_t and std::uint64_t on some platforms
CHECK(t.get<bool>() == true);
CHECK(f.get<bool>() == false);
CHECK(t.get<char>() == 1);
CHECK(t.get<signed char>() == 1);
CHECK(t.get<unsigned char>() == 1);
CHECK(t.get<short>() == 1); // NOLINT(google-runtime-int)
CHECK(t.get<unsigned short>() == 1); // NOLINT(google-runtime-int)
CHECK(t.get<int>() == 1);
CHECK(t.get<unsigned>() == 1);
CHECK(t.get<float>() == 1.0F);
CHECK(t.get<long double>() == 1.0L);
CHECK(f.get<int>() == 0);
CHECK(f.get<float>() == 0.0F);
}
#if !defined(JSON_NOEXCEPTION)
SECTION("number_integer_t, number_unsigned_t and number_float_t throw")
{
CHECK_THROWS_WITH_AS(t.get<json::number_integer_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
CHECK_THROWS_WITH_AS(t.get<json::number_unsigned_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
CHECK_THROWS_WITH_AS(t.get<json::number_float_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
CHECK_THROWS_WITH_AS(f.get<json::number_integer_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
CHECK_THROWS_WITH_AS(f.get<json::number_unsigned_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
CHECK_THROWS_WITH_AS(f.get<json::number_float_t>(), "[json.exception.type_error.302] type must be number, but is boolean", json::type_error&);
}
#endif
}
#ifdef JSON_HAS_CPP_14
#undef JSON_HAS_CPP_14
#endif