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 namespace LIBC_NAMESPACE_DECL { 15 16 // A type to interact with signed arithmetic types. 17 struct Sign { is_posSign18 LIBC_INLINE constexpr bool is_pos() const { return !is_negative; } is_negSign19 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 negateSign32 LIBC_INLINE constexpr Sign negate() const { return Sign(!is_negative); } 33 34 private: SignSign35 LIBC_INLINE constexpr explicit Sign(bool is_negative) 36 : is_negative(is_negative) {} 37 38 bool is_negative; 39 }; 40 41 LIBC_INLINE_VAR constexpr Sign Sign::NEG = Sign(true); 42 LIBC_INLINE_VAR constexpr Sign Sign::POS = Sign(false); 43 44 } // namespace LIBC_NAMESPACE_DECL 45 #endif // LLVM_LIBC_SRC___SUPPORT_SIGN_H 46