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Prefixed units support redesigned

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Mateusz Pusz committed 2019-10-18 15:34:46 +02:00
1 parent 95028d10a7
commit b864461636
30 files changed
+284 -236
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src/include/units/unit.h
+38 -41
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@@ -52,6 +52,30 @@ namespace units {
std::is_empty_v<T> &&
detail::is_unit<downcast_base_t<T>>;
template<typename PrefixType, Ratio R, basic_fixed_string Symbol>
struct prefix {
using prefix_type = PrefixType;
using ratio = R;
static constexpr auto symbol = Symbol;
};
// TODO gcc:92150
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92150
// namespace detail {
// template<typename T>
// inline constexpr bool is_prefix = false;
// template<typename PrefixType, Ratio R, basic_fixed_string Symbol>
// inline constexpr bool is_prefix<prefix<PrefixType, R, Symbol>> = true;
// } // namespace detail
template<typename T>
// concept Prefix = detail::is_prefix<T>;
concept Prefix = true;
// make_derived_unit
namespace detail {
@@ -115,56 +139,29 @@ namespace units {
// derived_unit
// TODO gcc:92101
// Gated by the following gcc bug
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92101
// template<typename Child, fixed_string Symbol, typename...>
// struct derived_unit;
// template<typename Child, fixed_string Symbol, Dimension D>
// struct derived_unit<Child, Symbol, D> : downcast_helper<Child, unit<D, ratio<1>>> {
// static constexpr auto symbol = Symbol;
// };
// template<typename Child, fixed_string Symbol, Dimension D, Ratio R>
// struct derived_unit<Child, Symbol, D, R> : downcast_helper<Child, unit<D, R>> {
// static constexpr auto symbol = Symbol;
// };
// template<typename Child, fixed_string Symbol, Unit U>
// struct derived_unit<Child, Symbol, U> : downcast_helper<Child, U> {
// static constexpr auto symbol = Symbol;
// };
// template<typename Child, fixed_string Symbol, Dimension D, Unit U, Unit... Us>
// struct derived_unit<Child, Symbol, D, U, Us...> : downcast_helper<Child, detail::make_derived_unit<D, U, Us...>> {
// static constexpr auto symbol = Symbol;
// };
struct no_prefix;
template<typename Child, typename Symbol, Dimension D, typename Prefix = no_prefix>
template<typename Child, basic_fixed_string Symbol, Dimension D, typename PrefixType = no_prefix>
struct coherent_derived_unit : downcast_helper<Child, unit<D, ratio<1>>> {
using symbol = Symbol;
using prefix = Prefix;
static constexpr auto symbol = Symbol;
using prefix_type = PrefixType;
};
template<typename Child, typename Symbol, typename...>
struct derived_unit;
template<typename Child, typename Symbol, Dimension D, Ratio R>
struct derived_unit<Child, Symbol, D, R> : downcast_helper<Child, unit<D, R>> {
using symbol = Symbol;
template<typename Child, basic_fixed_string Symbol, Dimension D, Ratio R>
struct derived_unit : downcast_helper<Child, unit<D, R>> {
static constexpr auto symbol = Symbol;
};
template<typename Child, typename Symbol, Unit U>
struct derived_unit<Child, Symbol, U> : downcast_helper<Child, U> {
using symbol = Symbol;
template<typename Child, Prefix P, Unit U>
requires requires { U::symbol; } && std::same_as<typename U::prefix_type, typename P::prefix_type>
struct prefixed_derived_unit : downcast_helper<Child, unit<typename U::dimension, ratio_multiply<typename P::ratio, typename U::ratio>>> {
static constexpr auto symbol = P::symbol + U::symbol;
using prefix_type = P::prefix_type;
};
template<typename Child, typename Symbol, Dimension D, Unit U, Unit... Us>
struct derived_unit<Child, Symbol, D, U, Us...> : downcast_helper<Child, detail::make_derived_unit<D, U, Us...>> {
using symbol = Symbol;
template<typename Child, basic_fixed_string Symbol, Dimension D, Unit U, Unit... Us>
struct deduced_derived_unit : downcast_helper<Child, detail::make_derived_unit<D, U, Us...>> {
static constexpr auto symbol = Symbol;
};
} // namespace units