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Add support for types explicitly convertible to fmt::string_view

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This commit is contained in:
Victor Zverovich 2018-07-18 14:12:10 -07:00
parent 6eaa507473
commit 73bed45b7a
2 changed files with 22 additions and 4 deletions
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9
include/fmt/core.h
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@ -672,10 +672,17 @@ inline typename std::enable_if<
typed_value<C, int_type>>::type
make_value(const T &val) { return static_cast<int>(val); }
template <typename C, typename T, typename Char = typename C::char_type>
inline typename std::enable_if<
std::is_constructible<basic_string_view<Char>, T>::value,
typed_value<C, string_type>>::type
make_value(const T &val) { return string_view(val); }
template <typename C, typename T, typename Char = typename C::char_type>
inline typename std::enable_if<
!convert_to_int<T, Char>::value &&
!std::is_convertible<T, basic_string_view<Char>>::value,
!std::is_convertible<T, basic_string_view<Char>>::value &&
!std::is_constructible<string_view, T>::value,
// Implicit conversion to std::string is not handled here because it's
// unsafe: https://github.com/fmtlib/fmt/issues/729
typed_value<C, custom_type>>::type

17
test/format-test.cc
View File

@ -1085,14 +1085,25 @@ TEST(FormatterTest, FormatStdStringView) {
}
#endif
struct ConvertibleToStringView {
struct implicitly_convertible_to_string_view {
operator fmt::string_view() const { return "foo"; }
};
TEST(FormatterTest, FormatConvertibleToStringView) {
EXPECT_EQ("foo", format("{}", ConvertibleToStringView()));
TEST(FormatterTest, FormatImplicitlyConvertibleToStringView) {
EXPECT_EQ("foo", format("{}", implicitly_convertible_to_string_view()));
}
// std::is_constructible is broken in MSVC until version 2015.
#if !FMT_MSC_VER || FMT_MSC_VER >= 1900
struct explicitly_convertible_to_string_view {
explicit operator fmt::string_view() const { return "foo"; }
};
TEST(FormatterTest, FormatExplicitlyConvertibleToStringView) {
EXPECT_EQ("foo", format("{}", explicitly_convertible_to_string_view()));
}
#endif
FMT_BEGIN_NAMESPACE
template <>
struct formatter<Date> {