Squashed 'externals/mp/' content from commit 29cb5588d

git-subtree-dir: externals/mp
git-subtree-split: 29cb5588da3a18ed571a0e41622900a01b9f01eb

include/mp/metavalue/lift_value.h

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+/* This file is part of the mp project.
+ * Copyright (c) 2017 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#pragma once
+
+#include <type_traits>
+
+namespace mp {
+
+/// Lifts a value into a type (a metavalue)
+template<auto V>
+using lift_value = std::integral_constant<decltype(V), V>;
+
+} // namespace mp

include/mp/metavalue/value_cast.h

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+/* This file is part of the mp project.
+ * Copyright (c) 2017 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#pragma once
+
+#include <type_traits>
+
+namespace mp {
+
+/// Casts a metavalue from one type to another
+template<class T, class V>
+using value_cast = std::integral_constant<T, static_cast<T>(V::value)>;
+
+} // namespace mp

include/mp/metavalue/value_equal.h

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+/* This file is part of the mp project.
+ * Copyright (c) 2020 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#pragma once
+
+#include <type_traits>
+
+namespace mp {
+
+/// Do two metavalues contain the same value?
+template<class V1, class V2>
+using value_equal = std::bool_constant<V1::value == V2::value>;
+
+} // namespace mp