blob: acefcda17441be8b2d2c07a1690478797f5cecfa [file] [log] [blame]
// Copyright 2019 The Pigweed Authors
// 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
// 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.
// Small, general preprocessor macros for C and C++ code.
#pragma once
// Returns the number of elements in a C array.
#define PW_ARRAY_SIZE(array) (sizeof(array) / sizeof(*array))
// Returns a string literal of the arguments after expanding macros.
#define _PW_STRINGIFY(...) #__VA_ARGS__
#ifdef __cplusplus
// Macro for inline extern "C" declarations. The following will compile
// correctly for C and C++:
// PW_EXTERN_C ThisFunctionHasCLinkage(void);
#define PW_EXTERN_C extern "C"
// Macros for opening and closing an extern "C" block. This avoids the need for
// an #ifdef __cplusplus check around the extern "C" { and closing }. Example:
// void FunctionDeclarationForCppAndC(void);
// void AnotherFunctionDeclarationForCppAndC(int, char);
#define PW_EXTERN_C_START extern "C" {
#define PW_EXTERN_C_END } // extern "C"
#else // extern "C" is removed from C code
#define PW_EXTERN_C
#endif // __cplusplus