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allow time formatting with wchar_t contexts

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change total specialization of 'struct formatter<std::tm>' into partial specialization 'template <typename Char> struct formatter<std::tm, Char>', backed by matching 'strftime'-like overloads
This commit is contained in:
Daniela Engert 2018-04-18 19:16:31 +02:00 committed by Victor Zverovich
parent a1579b0ff8
commit 2ae41242a5
1 changed files with 18 additions and 7 deletions
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25
include/fmt/time.h
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@ -93,11 +93,21 @@ inline std::tm gmtime(std::time_t time) {
return std::tm();
}
template <>
struct formatter<std::tm> {
namespace internal {
inline std::size_t strftime(char *str, std::size_t count, const char *format, const std::tm *time) {
return std::strftime(str, count, format, time);
}
inline std::size_t strftime(wchar_t *str, std::size_t count, const wchar_t *format, const std::tm *time) {
return std::wcsftime(str, count, format, time);
}
}
template <typename Char>
struct formatter<std::tm, Char> {
template <typename ParseContext>
auto parse(ParseContext &ctx) -> decltype(ctx.begin()) {
auto it = internal::null_terminating_iterator<char>(ctx);
auto it = internal::null_terminating_iterator<Char>(ctx);
if (*it == ':')
++it;
auto end = it;
@ -110,12 +120,13 @@ struct formatter<std::tm> {
return pointer_from(end);
}
auto format(const std::tm &tm, format_context &ctx) -> decltype(ctx.begin()) {
internal::buffer &buf = internal::get_container(ctx.begin());
template <typename FormatContext>
auto format(const std::tm &tm, FormatContext &ctx) -> decltype(ctx.begin()) {
internal::basic_buffer<Char> &buf = internal::get_container(ctx.begin());
std::size_t start = buf.size();
for (;;) {
std::size_t size = buf.capacity() - start;
std::size_t count = std::strftime(&buf[start], size, &tm_format[0], &tm);
std::size_t count = internal::strftime(&buf[start], size, &tm_format[0], &tm);
if (count != 0) {
buf.resize(start + count);
break;
@ -133,7 +144,7 @@ struct formatter<std::tm> {
return ctx.begin();
}
memory_buffer tm_format;
basic_memory_buffer<Char> tm_format;
};
}