83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_MACROS_H_
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#define NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_MACROS_H_
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#define SAFTM_DISALLOW_COPY_AND_ASSIGN(TypeName) \
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TypeName(const TypeName &) = delete; \
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TypeName &operator=(const TypeName &) = delete
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// The SAFTM_FALLTHROUGH_INTENDED macro can be used to annotate implicit
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// fall-through between switch labels:
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//
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// switch (x) {
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// case 40:
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// case 41:
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// if (truth_is_out_there) {
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// ++x;
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// SAFTM_FALLTHROUGH_INTENDED; // Use instead of/along with annotations
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// // in comments.
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// } else {
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// return x;
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// }
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// case 42:
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// ...
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//
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// As shown in the example above, the SAFTM_FALLTHROUGH_INTENDED macro should
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// be followed by a semicolon. It is designed to mimic control-flow statements
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// like 'break;', so it can be placed in most places where 'break;' can, but
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// only if there are no statements on the execution path between it and the
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// next switch label.
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//
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// When compiled with clang, the SAFTM_FALLTHROUGH_INTENDED macro is expanded
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// to [[clang::fallthrough]] attribute, which is analysed when performing
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// switch labels fall-through diagnostic ('-Wimplicit-fallthrough'). See clang
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// documentation on language extensions for details:
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// http://clang.llvm.org/docs/AttributeReference.html#fallthrough-clang-fallthrough
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//
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// When used with unsupported compilers, the SAFTM_FALLTHROUGH_INTENDED macro
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// has no effect on diagnostics.
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//
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// In either case this macro has no effect on runtime behavior and performance
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// of code.
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#if defined(__clang__) && defined(__has_warning)
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#if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
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#define SAFTM_FALLTHROUGH_INTENDED [[clang::fallthrough]] // NOLINT
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#endif
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#endif
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#ifndef SAFTM_FALLTHROUGH_INTENDED
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#define SAFTM_FALLTHROUGH_INTENDED \
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do { \
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} while (0)
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#endif
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// SAFTM_UNIQUE_ID(prefix) expands to a unique id that starts with prefix.
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//
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// The current implementation expands to prefix_<line_number>; hence, multiple
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// uses of this macro with the same prefix and on the same line will result in
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// the same identifier name. In those cases, if you need different ids, we
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// suggest you use different prefixes.
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//
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// Implementation is tricky; for more info, see
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// https://stackoverflow.com/questions/1597007/creating-c-macro-with-and-line-token-concatenation-with-positioning-macr
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#define SAFTM_UNIQUE_ID_INTERNAL2(x, y) x ## y
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#define SAFTM_UNIQUE_ID_INTERNAL(x, y) SAFTM_UNIQUE_ID_INTERNAL2(x, y)
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#define SAFTM_UNIQUE_ID(prefix) SAFTM_UNIQUE_ID_INTERNAL(prefix ## _, __LINE__)
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#endif // NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_MACROS_H_
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