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Add vformat_to_n (#769)

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This commit is contained in:
Victor Zverovich 2018-06-23 07:03:00 -07:00
parent ce500635c7
commit c2f3805488
1 changed files with 24 additions and 4 deletions
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28
include/fmt/format.h
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@ -3576,6 +3576,28 @@ struct format_to_n_result {
std::size_t size; std::size_t size;
}; };
template <typename OutputIt>
using format_to_n_context = typename fmt::format_context_t<
fmt::internal::truncating_iterator<OutputIt>>::type;
template <typename OutputIt>
using format_to_n_args = fmt::basic_format_args<format_to_n_context<OutputIt>>;
template <typename OutputIt, typename ...Args>
inline format_arg_store<format_to_n_context<OutputIt>, Args...>
make_format_to_n_args(const Args & ... args) {
return format_arg_store<format_to_n_context<OutputIt>, Args...>(args...);
}
template <typename OutputIt, typename... Args>
inline format_to_n_result<OutputIt> vformat_to_n(
OutputIt out, std::size_t n, string_view format_str,
format_to_n_args<OutputIt> args) {
typedef internal::truncating_iterator<OutputIt> It;
auto it = vformat_to(It(out, n), format_str, args);
return {it.base(), it.count()};
}
/** /**
\rst \rst
Formats arguments, writes up to ``n`` characters of the result to the output Formats arguments, writes up to ``n`` characters of the result to the output
@ -3586,10 +3608,8 @@ struct format_to_n_result {
template <typename OutputIt, typename... Args> template <typename OutputIt, typename... Args>
inline format_to_n_result<OutputIt> format_to_n( inline format_to_n_result<OutputIt> format_to_n(
OutputIt out, std::size_t n, string_view format_str, const Args &... args) { OutputIt out, std::size_t n, string_view format_str, const Args &... args) {
typedef internal::truncating_iterator<OutputIt> It; return vformat_to_n(out, n, format_str,
auto it = vformat_to(It(out, n), format_str, make_format_to_n_args<OutputIt>(args...));
make_format_args<typename format_context_t<It>::type>(args...));
return {it.base(), it.count()};
} }
template <typename OutputIt, typename... Args> template <typename OutputIt, typename... Args>
inline format_to_n_result<OutputIt> format_to_n( inline format_to_n_result<OutputIt> format_to_n(