Units and dimensions redesigned

2019-12-01 19:47:58 +01:00
parent 65ea59edbb
commit 1b4e8a2127
16 changed files with 922 additions and 904 deletions
@@ -26,23 +26,53 @@

 namespace units {

-  namespace detail {
+// conditional
+namespace detail {

-    template<bool>
-    struct conditional_impl {
-      template<typename T, typename F>
-      using type = F;
-    };
+template<bool>
+struct conditional_impl {
+  template<typename T, typename F>
+  using type = F;
+};

-    template<>
-    struct conditional_impl<true> {
-      template<typename T, typename F>
-      using type = T;
-    };
+template<>
+struct conditional_impl<true> {
+  template<typename T, typename F>
+  using type = T;
+};

-  }
+}  // namespace detail

-  template<bool B, typename T, typename F>
-  using conditional = detail::conditional_impl<B>::template type<T, F>;
+template<bool B, typename T, typename F>
+using conditional = detail::conditional_impl<B>::template type<T, F>;

-}
+// is_instantiation
+namespace detail {
+
+template<typename T, template<typename...> typename Type>
+inline constexpr bool is_instantiation_impl = false;
+
+template<typename... Params, template<typename...> typename Type>
+inline constexpr bool is_instantiation_impl<Type<Params...>, Type> = true;
+
+}  // namespace detail
+
+template<typename T, template<typename...> typename Type>
+inline constexpr bool is_instantiation = detail::is_instantiation_impl<T, Type>;
+
+// is_derived_from_instantiation
+namespace detail {
+
+template<template<typename...> typename Type>
+struct is_derived_from_instantiation_impl {
+  template<typename... Params>
+  static constexpr std::true_type check_base(const Type<Params...>&);
+  static constexpr std::true_type check_base(...);
+};
+
+}  // namespace detail
+
+template<typename T, template<typename...> typename Type>
+inline constexpr bool is_derived_from_instantiation = decltype(detail::is_derived_from_instantiation_impl<Type>::check_base(std::declval<T>()))::value;
+
+}  // namespace units
@@ -0,0 +1,41 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#pragma once
+
+#include <units/bits/type_traits.h>
+#include <units/ratio.h>
+
+namespace units {
+
+namespace detail {
+
+template<typename U, Ratio R>
+struct reference_unit;
+
+}  // namespace detail
+
+// Unit
+template<typename T>
+concept Unit = is_derived_from_instantiation<T, detail::reference_unit>;
+
+}  // namespace units