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cast.h
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#ifndef RBIMPL_CAST_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_CAST_H /** * @author Ruby developers <ruby-core@ruby-lang.org> * @copyright This file is a part of the programming language Ruby. * Permission is hereby granted, to either redistribute and/or * modify this file, provided that the conditions mentioned in the * file COPYING are met. Consult the file for details. * @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are * implementation details. Don't take them as canon. They could * rapidly appear then vanish. The name (path) of this header file * is also an implementation detail. Do not expect it to persist * at the place it is now. Developers are free to move it anywhere * anytime at will. * @note To ruby-core: remember that this header can be possibly * recursively included from extension libraries written in C++. * Do not expect for instance `__VA_ARGS__` is always available. * We assume C99 for ruby itself but we don't assume languages of * extension libraries. They could be written in C++98. * @brief Defines RBIMPL_CAST. * * This casting macro makes sense only inside of other macros that are part of * public headers. They could be used from C++, and C-style casts could issue * warnings. Ruby internals are pure C so they should not bother. */ #include "ruby/internal/compiler_since.h" #include "ruby/internal/has/warning.h" #include "ruby/internal/warning_push.h" #if ! defined(__cplusplus) # define RBIMPL_CAST(expr) (expr) #elif RBIMPL_COMPILER_SINCE(GCC, 4, 6, 0) # /* g++ has -Wold-style-cast since 1997 or so, but its _Pragma is broken. */ # /* See https://gcc.godbolt.org/z/XWhU6J */ # define RBIMPL_CAST(expr) (expr) # pragma GCC diagnostic ignored "-Wold-style-cast" #elif RBIMPL_HAS_WARNING("-Wold-style-cast") # define RBIMPL_CAST(expr) \ RBIMPL_WARNING_PUSH() \ RBIMPL_WARNING_IGNORED(-Wold-style-cast) \ (expr) \ RBIMPL_WARNING_POP() #else # define RBIMPL_CAST(expr) (expr) #endif #endif /* RBIMPL_CAST_H */