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[wpimath] Clean up unit formatter (#5584)

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This commit is contained in:
Tyler Veness
2023-08-29 08:56:48 -07:00
committed by GitHub
parent d7264ff597
commit f1d7b05723
1 changed files with 19 additions and 16 deletions
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35
wpimath/src/main/native/include/units/formatter.h
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@@ -4,41 +4,41 @@
#pragma once
#include <type_traits>
#include <fmt/format.h>
#include "units/base.h"
// FIXME: Replace enable_if with requires clause and remove <type_traits>
// include once using GCC >= 12. GCC 11 incorrectly emits a struct redefinition
// error because it doesn't use the requires clause to disambiguate.
/**
* Formatter for unit types.
*
* @tparam Units Unit tag for which type of units the `unit_t` represents (e.g.
* meters).
* @tparam T Underlying type of the storage. Defaults to double.
* @tparam NonLinearScale Optional scale class for the units. Defaults to linear
* (i.e. does not scale the unit value). Examples of
* non-linear scales could be logarithmic, decibel, or
* richter scales. Non-linear scales must adhere to the
* non-linear-scale concept.
*/
template <class Units, typename T, template <typename> class NonLinearScale>
struct fmt::formatter<units::unit_t<Units, T, NonLinearScale>>
: fmt::formatter<double> {
template <typename Unit, typename CharT>
struct fmt::formatter<Unit, CharT,
std::enable_if_t<units::traits::is_unit_t_v<Unit>>> {
constexpr auto parse(fmt::format_parse_context& ctx) {
return m_underlying.parse(ctx);
}
/**
* Writes out a formatted unit.
*
* @param obj Unit instance.
* @param ctx Format string context.
*/
auto format(const units::unit_t<Units, T, NonLinearScale>& obj,
fmt::format_context& ctx) const {
auto format(const Unit& obj, fmt::format_context& ctx) const {
using Units = typename Unit::unit_type;
using BaseUnits =
units::unit<std::ratio<1>,
typename units::traits::unit_traits<Units>::base_unit_type>;
auto out = ctx.out();
out = fmt::formatter<double>::format(
units::convert<Units, BaseUnits>(obj()), ctx);
out = m_underlying.format(units::convert<Units, BaseUnits>(obj()), ctx);
if constexpr (units::traits::unit_traits<
Units>::base_unit_type::meter_ratio::num != 0) {
@@ -213,4 +213,7 @@ struct fmt::formatter<units::unit_t<Units, T, NonLinearScale>>
return out;
}
private:
fmt::formatter<typename Unit::underlying_type, CharT> m_underlying;
};