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1//===-- A simple sign type --------------------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_LIBC_SRC___SUPPORT_SIGN_H10#define LLVM_LIBC_SRC___SUPPORT_SIGN_H11 12#include "src/__support/macros/attributes.h" // LIBC_INLINE, LIBC_INLINE_VAR13 14namespace LIBC_NAMESPACE_DECL {15 16// A type to interact with signed arithmetic types.17struct Sign {18 LIBC_INLINE constexpr bool is_pos() const { return !is_negative; }19 LIBC_INLINE constexpr bool is_neg() const { return is_negative; }20 21 LIBC_INLINE friend constexpr bool operator==(Sign a, Sign b) {22 return a.is_negative == b.is_negative;23 }24 25 LIBC_INLINE friend constexpr bool operator!=(Sign a, Sign b) {26 return !(a == b);27 }28 29 static const Sign POS;30 static const Sign NEG;31 32 LIBC_INLINE constexpr Sign negate() const { return Sign(!is_negative); }33 34private:35 LIBC_INLINE constexpr explicit Sign(bool is_negative)36 : is_negative(is_negative) {}37 38 bool is_negative;39};40 41LIBC_INLINE_VAR constexpr Sign Sign::NEG = Sign(true);42LIBC_INLINE_VAR constexpr Sign Sign::POS = Sign(false);43 44} // namespace LIBC_NAMESPACE_DECL45#endif // LLVM_LIBC_SRC___SUPPORT_SIGN_H46