| /* |
| * Copyright 2024 WebAssembly Community Group participants |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef wasm_stdckdint_h |
| #define wasm_stdckdint_h |
| |
| // This is a partial "polyfill" for the C23 file stdckdint.h. It allows us to |
| // use that API even in older compilers. |
| |
| namespace std { |
| |
| template<typename T> bool ckd_add(T* output, T a, T b) { |
| #if __has_builtin(__builtin_add_overflow) |
| return __builtin_add_overflow(a, b, output); |
| #else |
| // Atm this polyfill only supports unsigned types. |
| static_assert(std::is_unsigned_v<T>); |
| |
| T result = a + b; |
| if (result < a) { |
| return true; |
| } |
| *output = result; |
| return false; |
| #endif |
| } |
| |
| } // namespace std |
| |
| #endif // wasm_stdckdint_h |
