fmtlib/fmt
1
0
Fork 1
mirror of https://github.com/fmtlib/fmt.git synced 2025-11-27 21:00:01 +01:00
Code Issues Packages Projects Releases Wiki Activity

Implement nested formatter

Browse Source
This commit is contained in:
Victor Zverovich
2023-09-18 11:09:28 -07:00
parent f6ca4ea199
commit 0e01e46c11
3 changed files with 43 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
include/fmt/format.h
View File

@@ -4222,13 +4222,35 @@ struct formatter<nested_view<T>> {
template <typename T>
struct nested_formatter {
private:
int width_;
detail::fill_t<char> fill_;
align_t align_ : 4;
formatter<T> formatter_;
public:
FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> const char* {
auto specs = detail::dynamic_format_specs<char>();
auto it = parse_format_specs(
ctx.begin(), ctx.end(), specs, ctx, detail::type::none_type);
width_ = specs.width;
fill_ = specs.fill;
align_ = specs.align;
ctx.advance_to(it);
return formatter_.parse(ctx);
}
template <typename F>
auto write_padded(format_context& ctx, F write) const -> decltype(ctx.out()) {
if (width_ == 0) return write(ctx.out());
auto buf = memory_buffer();
write(std::back_inserter(buf));
auto specs = format_specs<>();
specs.width = width_;
specs.fill = fill_;
specs.align = align_;
return detail::write(ctx.out(), string_view(buf.data(), buf.size()), specs);
}
auto nested(const T& value) const -> nested_view<T> {
return nested_view<T>{&formatter_, &value};
}