Squashed 'externals/mcl/' content from commit a86a53843

git-subtree-dir: externals/mcl
git-subtree-split: a86a53843f82e4d6ca2f2e1437824495acad2712

include/mcl/concepts/bit_integral.hpp

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+// This file is part of the mcl project.
+// Copyright (c) 2022 merryhime
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include "mcl/concepts/is_any_of.hpp"
+#include "mcl/stdint.hpp"
+
+namespace mcl {
+
+/// Integral upon which bit operations can be safely performed.
+template<typename T>
+concept BitIntegral = IsAnyOf<T, u8, u16, u32, u64, uptr, size_t>;
+
+}  // namespace mcl