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Constexpr formatted_size (#3026)

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* Constexpr formatted_size

* Add C++20 tests for gcc 9 and 10

* Adjust unit test to require __cpp_lib_bit_cast
This commit is contained in:
Mark Santaniello
2022-08-10 09:35:30 -07:00
committed by GitHub
parent 7fb8d33f9d
commit fd93b633b8
3 changed files with 17 additions and 13 deletions
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include/fmt/compile.h
+2 -2
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@@ -14,7 +14,7 @@ FMT_BEGIN_NAMESPACE
namespace detail {
template <typename Char, typename InputIt>
inline counting_iterator copy_str(InputIt begin, InputIt end,
FMT_CONSTEXPR inline counting_iterator copy_str(InputIt begin, InputIt end,
counting_iterator it) {
return it + (end - begin);
}
@@ -568,7 +568,7 @@ format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n,
template <typename S, typename... Args,
FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
size_t formatted_size(const S& format_str, const Args&... args) {
FMT_CONSTEXPR20 size_t formatted_size(const S& format_str, const Args&... args) {
return fmt::format_to(detail::counting_iterator(), format_str, args...)
.count();
}