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Add formatter<std::string_view>

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This commit is contained in:
Victor Zverovich 2019-06-22 19:48:37 -07:00
parent 635e01fe74
commit 72e519a4bd
2 changed files with 14 additions and 2 deletions
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1
include/fmt/format.h
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@ -3005,6 +3005,7 @@ FMT_FORMAT_AS(float, double);
FMT_FORMAT_AS(Char*, const Char*);
FMT_FORMAT_AS(std::basic_string<Char>, basic_string_view<Char>);
FMT_FORMAT_AS(std::nullptr_t, const void*);
FMT_FORMAT_AS(internal::std_string_view<Char>, basic_string_view<Char>);
template <typename Char>
struct formatter<void*, Char> : formatter<const void*, Char> {

15
test/format-test.cc
View File

@ -1590,9 +1590,20 @@ TEST(FormatterTest, FormatStringView) {
EXPECT_EQ("", format("{}", string_view()));
}
#ifdef FMT_USE_STD_STRING_VIEW
#ifdef FMT_USE_STRING_VIEW
struct string_viewable {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<string_viewable> : formatter<std::string_view> {
auto format(string_viewable, format_context& ctx) -> decltype(ctx.out()) {
return formatter<std::string_view>::format("foo", ctx);
}
};
FMT_END_NAMESPACE
TEST(FormatterTest, FormatStdStringView) {
EXPECT_EQ("test", format("{0}", std::string_view("test")));
EXPECT_EQ("test", format("{}", std::string_view("test")));
EXPECT_EQ("foo", format("{}", string_viewable()));
}
#endif