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Fix handling of types convertible to std::string_view

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This commit is contained in:
Victor Zverovich 2019-10-04 17:21:10 -07:00
parent 0571013709
commit 0c7650373c
2 changed files with 19 additions and 0 deletions
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8
include/fmt/core.h
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@ -828,6 +828,14 @@ template <typename Context> struct arg_mapper {
FMT_CONSTEXPR basic_string_view<char_type> map(const T& val) {
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)>
FMT_CONSTEXPR basic_string_view<char_type> map(const T& val) {
return std_string_view<char_type>(val);
}
FMT_CONSTEXPR const char* map(const signed char* val) {
static_assert(std::is_same<char_type, char>::value, "invalid string type");
return reinterpret_cast<const char*>(val);

11
test/core-test.cc
View File

@ -613,6 +613,17 @@ TEST(FormatterTest, FormatExplicitlyConvertibleToStringView) {
EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_view()));
}
#ifdef FMT_USE_STRING_VIEW
struct explicitly_convertible_to_std_string_view {
explicit operator std::string_view() const { return "foo"; }
};
TEST(FormatterTest, FormatExplicitlyConvertibleToStdStringView) {
EXPECT_EQ("foo",
fmt::format("{}", explicitly_convertible_to_std_string_view()));
}
#endif
struct explicitly_convertible_to_wstring_view {
explicit operator fmt::wstring_view() const { return L"foo"; }
};