| //===-- A simple sign type --------------------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_SRC___SUPPORT_SIGN_H |
| #define LLVM_LIBC_SRC___SUPPORT_SIGN_H |
| |
| #include "src/__support/macros/attributes.h" // LIBC_INLINE, LIBC_INLINE_VAR |
| |
| // A type to interact with signed arithmetic types. |
| struct Sign { |
| LIBC_INLINE constexpr bool is_pos() const { return !is_negative; } |
| LIBC_INLINE constexpr bool is_neg() const { return is_negative; } |
| |
| LIBC_INLINE friend constexpr bool operator==(Sign a, Sign b) { |
| return a.is_negative == b.is_negative; |
| } |
| |
| LIBC_INLINE friend constexpr bool operator!=(Sign a, Sign b) { |
| return !(a == b); |
| } |
| |
| static const Sign POS; |
| static const Sign NEG; |
| |
| private: |
| LIBC_INLINE constexpr explicit Sign(bool is_negative) |
| : is_negative(is_negative) {} |
| |
| bool is_negative; |
| }; |
| |
| LIBC_INLINE_VAR constexpr Sign Sign::NEG = Sign(true); |
| LIBC_INLINE_VAR constexpr Sign Sign::POS = Sign(false); |
| |
| #endif // LLVM_LIBC_SRC___SUPPORT_SIGN_H |