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Remove problematic constructibility check

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This commit is contained in:
Victor Zverovich 2022-02-04 11:12:04 -08:00
parent 31e743d06e
commit 8a21e328b8
4 changed files with 22 additions and 15 deletions
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15
include/fmt/core.h
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@ -1337,20 +1337,19 @@ template <typename Context> struct arg_mapper {
}
template <typename T,
FMT_ENABLE_IF(
std::is_constructible<basic_string_view<char_type>, T>::value &&
std::is_convertible<T, basic_string_view<char_type>>::value &&
!is_string<T>::value && !has_formatter<T, Context>::value &&
!has_fallback_formatter<T, char_type>::value)>
FMT_CONSTEXPR FMT_INLINE auto map(const T& val)
-> basic_string_view<char_type> {
return basic_string_view<char_type>(val);
}
template <
typename T,
FMT_ENABLE_IF(
std::is_constructible<std_string_view<char_type>, T>::value &&
!std::is_constructible<basic_string_view<char_type>, T>::value &&
!is_string<T>::value && !has_formatter<T, Context>::value &&
!has_fallback_formatter<T, char_type>::value)>
template <typename T,
FMT_ENABLE_IF(
std::is_convertible<T, std_string_view<char_type>>::value &&
!std::is_convertible<T, basic_string_view<char_type>>::value &&
!is_string<T>::value && !has_formatter<T, Context>::value &&
!has_fallback_formatter<T, char_type>::value)>
FMT_CONSTEXPR FMT_INLINE auto map(const T& val)
-> basic_string_view<char_type> {
return std_string_view<char_type>(val);

12
test/core-test.cc
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@ -890,7 +890,10 @@ struct explicitly_convertible_to_string_view {
};
TEST(core_test, format_explicitly_convertible_to_string_view) {
EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_view()));
// Types explicitly convertible to string_view are not formattable by
// default because it may introduce ODR violations.
static_assert(
!fmt::is_formattable<explicitly_convertible_to_string_view>::value, "");
}
# ifdef FMT_USE_STRING_VIEW
@ -899,8 +902,11 @@ struct explicitly_convertible_to_std_string_view {
};
TEST(core_test, format_explicitly_convertible_to_std_string_view) {
EXPECT_EQ("foo",
fmt::format("{}", explicitly_convertible_to_std_string_view()));
// Types explicitly convertible to string_view are not formattable by
// default because it may introduce ODR violations.
static_assert(
!fmt::is_formattable<explicitly_convertible_to_std_string_view>::value,
"");
}
# endif
#endif

4
test/ranges-test.cc
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@ -133,8 +133,8 @@ TEST(ranges_test, path_like) {
struct string_like {
const char* begin();
const char* end();
explicit operator fmt::string_view() const { return "foo"; }
explicit operator std::string_view() const { return "foo"; }
operator fmt::string_view() const { return "foo"; }
operator std::string_view() const { return "foo"; }
};
TEST(ranges_test, format_string_like) {

6
test/xchar-test.cc
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@ -72,8 +72,10 @@ struct explicitly_convertible_to_wstring_view {
};
TEST(xchar_test, format_explicitly_convertible_to_wstring_view) {
EXPECT_EQ(L"foo",
fmt::format(L"{}", explicitly_convertible_to_wstring_view()));
// Types explicitly convertible to wstring_view are not formattable by
// default because it may introduce ODR violations.
static_assert(
!fmt::is_formattable<explicitly_convertible_to_wstring_view>::value, "");
}
#endif