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Enables formatting support for Angle objects

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Adds a partial specialization of `std::formatter` for `omath::Angle`
to provide formatting support using `std::format`.

This allows `Angle` objects to be easily formatted as strings,
including degree symbol representation, using standard formatting
techniques.
This commit is contained in:
Orange
2025-09-14 04:43:01 +03:00
parent d66f60d419
commit e333d81b81
1 changed files with 19 additions and 8 deletions
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27
include/omath/angle.hpp
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@@ -5,8 +5,8 @@
#pragma once #pragma once
#include "omath/angles.hpp" #include "omath/angles.hpp"
#include <algorithm> #include <algorithm>
#include <utility>
#include <format> #include <format>
#include <utility>
namespace omath namespace omath
{ {
@@ -150,17 +150,28 @@ namespace omath
} }
}; };
} // namespace omath } // namespace omath
template<class Type, Type min, Type max, omath::AngleFlags flags> // partial specialization of std::formatter for omath::Angle
struct std::formatter<omath::Angle<Type, min, max, flags>> // NOLINT(*-dcl58-cpp) template<class T, T MinV, T MaxV, omath::AngleFlags F, class CharT>
struct std::formatter<omath::Angle<T, MinV, MaxV, F>, CharT>
{ {
using AngleT = omath::Angle<T, MinV, MaxV, F>;
// required: default ctor is implicitly OK
// parse with the correct CharT-aware context
[[nodiscard]] [[nodiscard]]
static constexpr auto parse(std::format_parse_context& ctx) static constexpr auto parse(std::basic_format_parse_context<CharT>& ctx)
-> std::basic_format_parse_context<CharT>::iterator
{ {
return ctx.begin(); return ctx.begin(); // no custom format specifiers
} }
[[nodiscard]]
static auto format(const omath::Angle<Type, min, max, flags>& deg, std::format_context& ctx) // format; here we only implement for narrow char to keep it simple
template<class FormatContext>
auto format(const AngleT& deg, FormatContext& ctx) const
{ {
return std::format_to(ctx.out(), "{}deg", deg.as_degrees()); if constexpr (std::is_same_v<typename FormatContext::char_type, char>)
return std::format_to(ctx.out(), "{}deg", deg.as_degrees());
return std::format_to(ctx.out(), L"{}deg", deg.as_degrees());
} }
}; };