63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
//===-- sanitizer_type_traits.h ---------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Implements a subset of C++ type traits. This is so we can avoid depending
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// on system C++ headers.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_TYPE_TRAITS_H
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#define SANITIZER_TYPE_TRAITS_H
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namespace __sanitizer {
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struct true_type {
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static const bool value = true;
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};
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struct false_type {
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static const bool value = false;
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};
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// is_same<T, U>
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//
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// Type trait to compare if types are the same.
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// E.g.
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//
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// ```
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// is_same<int,int>::value - True
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// is_same<int,char>::value - False
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// ```
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template <typename T, typename U>
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struct is_same : public false_type {};
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template <typename T>
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struct is_same<T, T> : public true_type {};
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// conditional<B, T, F>
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//
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// Defines type as T if B is true or as F otherwise.
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// E.g. the following is true
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//
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// ```
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// is_same<int, conditional<true, int, double>::type>::value
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// is_same<double, conditional<false, int, double>::type>::value
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// ```
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template <bool B, class T, class F>
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struct conditional {
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using type = T;
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};
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template <class T, class F>
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struct conditional<false, T, F> {
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using type = F;
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};
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} // namespace __sanitizer
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#endif
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