| 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 { |
| 16 | LIBC_INLINE constexpr bool is_pos() const { return !is_negative; } |
| 17 | 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: |
| 31 | 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 |