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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_SRC___SUPPORT_SIGN_H 10 #define LLVM_LIBC_SRC___SUPPORT_SIGN_H 11 12 #include "src/__support/macros/attributes.h" // LIBC_INLINE, LIBC_INLINE_VAR 13 14 // A type to interact with signed arithmetic types. 15 struct Sign { is_posSign16 LIBC_INLINE constexpr bool is_pos() const { return !is_negative; } is_negSign17 LIBC_INLINE constexpr bool is_neg() const { return is_negative; } 18 19 LIBC_INLINE friend constexpr bool operator==(Sign a, Sign b) { 20 return a.is_negative == b.is_negative; 21 } 22 23 LIBC_INLINE friend constexpr bool operator!=(Sign a, Sign b) { 24 return !(a == b); 25 } 26 27 static const Sign POS; 28 static const Sign NEG; 29 30 private: SignSign31 LIBC_INLINE constexpr explicit Sign(bool is_negative) 32 : is_negative(is_negative) {} 33 34 bool is_negative; 35 }; 36 37 LIBC_INLINE_VAR constexpr Sign Sign::NEG = Sign(true); 38 LIBC_INLINE_VAR constexpr Sign Sign::POS = Sign(false); 39 40 #endif // LLVM_LIBC_SRC___SUPPORT_SIGN_H 41