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Skip the deleted-overload checks of json_view on MSVC 2015

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MSVC 2015 does not treat selecting a deleted function in decltype as a
substitution failure, so is_detected reports the deleted
parse/parse_copy/accept/read(ptr, len) overloads as callable and the
static_asserts in "integer arguments do not compile" fail (AppVeyor
VS2015 jobs). Calling them still fails to compile there. Guard the
negative checks as unit-delete_deprecated_functions.cpp does.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-19 22:06:50 +02:00
1 parent f8895c72a9
commit 6f439a89f4
1 file changed
+12 -8
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tests/src/unit-json_view.cpp
+12 -8
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@@ -511,27 +511,31 @@ TEST_CASE("json_view")
{
using nlohmann::detail::is_detected;
// a length is not a flag: parse(ptr, len) would convert len to
// allow_exceptions and read ptr as a C string, which need not end
static_assert(is_detected<parse_call_t, const char*, bool>::value, "parse(ptr, bool) is valid");
static_assert(is_detected<parse_call_t, const char*, bool, bool, bool>::value, "parse(ptr, bool, bool, bool) is valid");
static_assert(is_detected<parse_call_t, const char*, const char*>::value, "parse(first, last) is valid");
static_assert(is_detected<parse_call_t, const char*, const char*, bool>::value, "parse(first, last, bool) is valid");
static_assert(is_detected<parse_copy_call_t, const char*, bool>::value, "parse_copy(ptr, bool) is valid");
static_assert(is_detected<accept_call_t, const char*, bool>::value, "accept(ptr, bool) is valid");
static_assert(is_detected<read_call_t, const char*, bool>::value, "read(ptr, bool) is valid");
// a length is not a flag: parse(ptr, len) would convert len to
// allow_exceptions and read ptr as a C string, which need not end
//
// MSVC 2015 does not treat selecting a deleted function in decltype as
// a substitution failure, so it detects the deleted overloads as
// callable; calling them still fails to compile
#if !(defined(_MSC_VER) && _MSC_VER < 1910)
static_assert(!is_detected<parse_call_t, const char*, std::size_t>::value, "parse(ptr, len) must not compile");
static_assert(!is_detected<parse_call_t, const char*, int>::value, "parse(ptr, int) must not compile");
static_assert(!is_detected<parse_call_t, const char*, char>::value, "parse(ptr, char) must not compile");
static_assert(!is_detected<parse_call_t, const char*, std::size_t, bool>::value, "parse(ptr, len, bool) must not compile");
static_assert(!is_detected<parse_call_t, const std::string&, std::size_t>::value, "parse(string, len) must not compile");
static_assert(!is_detected<parse_call_t, const std::vector<char>&, std::size_t>::value, "parse(vector, len) must not compile");
static_assert(is_detected<parse_copy_call_t, const char*, bool>::value, "parse_copy(ptr, bool) is valid");
static_assert(!is_detected<parse_copy_call_t, const char*, std::size_t>::value, "parse_copy(ptr, len) must not compile");
static_assert(is_detected<accept_call_t, const char*, bool>::value, "accept(ptr, bool) is valid");
static_assert(!is_detected<accept_call_t, const char*, std::size_t>::value, "accept(ptr, len) must not compile");
static_assert(is_detected<read_call_t, const char*, bool>::value, "read(ptr, bool) is valid");
static_assert(!is_detected<read_call_t, const char*, std::size_t>::value, "read(ptr, len) must not compile");
#endif
// json_view has no conversion to bool: unlike basic_json's, it would
// mean "exists", not "is not null"; use is_discarded()