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Type erase output iterators

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This commit is contained in:
Victor Zverovich
2020-07-17 11:21:11 -07:00
parent 18024853b6
commit 9d3cd0afb2
2 changed files with 50 additions and 3 deletions
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15
include/fmt/format.h
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@@ -581,6 +581,12 @@ void buffer<T>::append(const U* begin, const U* end) {
begin += count;
} while (begin != end);
}
template <typename OutputIt, typename T>
void iterator_buffer<OutputIt, T>::flush() {
out_ = std::copy(data_, data_ + this->size(), out_);
this->clear();
}
} // namespace detail
// The number of characters to store in the basic_memory_buffer object itself
@@ -3560,9 +3566,12 @@ template <typename OutputIt, typename S, typename... Args,
detail::is_string<S>::value)>
inline OutputIt format_to(OutputIt out, const S& format_str, Args&&... args) {
detail::check_format_string<Args...>(format_str);
using context = format_context_t<OutputIt, char_t<S>>;
return vformat_to(out, to_string_view(format_str),
make_format_args<context>(args...));
using Char = char_t<S>;
detail::iterator_buffer<OutputIt, Char> buf(out);
detail::vformat_to(buf, to_string_view(format_str),
make_format_args<buffer_context<Char>>(args...));
buf.flush();
return buf.out();
}
template <typename OutputIt> struct format_to_n_result {