| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * 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 NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_MACROS_H_ |
| #define NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_MACROS_H_ |
| |
| #define SAFTM_DISALLOW_COPY_AND_ASSIGN(TypeName) \ |
| TypeName(const TypeName &) = delete; \ |
| TypeName &operator=(const TypeName &) = delete |
| |
| // The SAFTM_FALLTHROUGH_INTENDED macro can be used to annotate implicit |
| // fall-through between switch labels: |
| // |
| // switch (x) { |
| // case 40: |
| // case 41: |
| // if (truth_is_out_there) { |
| // ++x; |
| // SAFTM_FALLTHROUGH_INTENDED; // Use instead of/along with annotations |
| // // in comments. |
| // } else { |
| // return x; |
| // } |
| // case 42: |
| // ... |
| // |
| // As shown in the example above, the SAFTM_FALLTHROUGH_INTENDED macro should |
| // be followed by a semicolon. It is designed to mimic control-flow statements |
| // like 'break;', so it can be placed in most places where 'break;' can, but |
| // only if there are no statements on the execution path between it and the |
| // next switch label. |
| // |
| // When compiled with clang, the SAFTM_FALLTHROUGH_INTENDED macro is expanded |
| // to [[clang::fallthrough]] attribute, which is analysed when performing |
| // switch labels fall-through diagnostic ('-Wimplicit-fallthrough'). See clang |
| // documentation on language extensions for details: |
| // http://clang.llvm.org/docs/AttributeReference.html#fallthrough-clang-fallthrough |
| // |
| // When used with unsupported compilers, the SAFTM_FALLTHROUGH_INTENDED macro |
| // has no effect on diagnostics. |
| // |
| // In either case this macro has no effect on runtime behavior and performance |
| // of code. |
| #if defined(__clang__) && defined(__has_warning) |
| #if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough") |
| #define SAFTM_FALLTHROUGH_INTENDED [[clang::fallthrough]] // NOLINT |
| #endif |
| #endif |
| |
| #ifndef SAFTM_FALLTHROUGH_INTENDED |
| #define SAFTM_FALLTHROUGH_INTENDED \ |
| do { \ |
| } while (0) |
| #endif |
| |
| // SAFTM_UNIQUE_ID(prefix) expands to a unique id that starts with prefix. |
| // |
| // The current implementation expands to prefix_<line_number>; hence, multiple |
| // uses of this macro with the same prefix and on the same line will result in |
| // the same identifier name. In those cases, if you need different ids, we |
| // suggest you use different prefixes. |
| // |
| // Implementation is tricky; for more info, see |
| // https://stackoverflow.com/questions/1597007/creating-c-macro-with-and-line-token-concatenation-with-positioning-macr |
| #define SAFTM_UNIQUE_ID_INTERNAL2(x, y) x ## y |
| #define SAFTM_UNIQUE_ID_INTERNAL(x, y) SAFTM_UNIQUE_ID_INTERNAL2(x, y) |
| #define SAFTM_UNIQUE_ID(prefix) SAFTM_UNIQUE_ID_INTERNAL(prefix ## _, __LINE__) |
| |
| #endif // NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_MACROS_H_ |
