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static_assert.h
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#ifndef RBIMPL_STATIC_ASSERT_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_STATIC_ASSERT_H /** * @file * @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_STATIC_ASSERT. */ #include <assert.h> #include "ruby/internal/has/extension.h" #include "ruby/internal/compiler_since.h" #include "ruby/internal/attr/maybe_unused.h" /** @cond INTERNAL_MACRO */ #if defined(__cplusplus) && defined(__cpp_static_assert) # /* https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations */ # define RBIMPL_STATIC_ASSERT0 static_assert #elif defined(__cplusplus) && RBIMPL_COMPILER_SINCE(MSVC, 16, 0, 0) # define RBIMPL_STATIC_ASSERT0 static_assert #elif defined(__INTEL_CXX11_MODE__) # define RBIMPL_STATIC_ASSERT0 static_assert #elif defined(__cplusplus) && __cplusplus >= 201103L # define RBIMPL_STATIC_ASSERT0 static_assert #elif defined(__cplusplus) && RBIMPL_HAS_EXTENSION(cxx_static_assert) # define RBIMPL_STATIC_ASSERT0 __extension__ static_assert #elif defined(__GXX_EXPERIMENTAL_CXX0X__) && __GXX_EXPERIMENTAL_CXX0X__ # define RBIMPL_STATIC_ASSERT0 __extension__ static_assert #elif defined(__STDC_VERSION__) && RBIMPL_HAS_EXTENSION(c_static_assert) # define RBIMPL_STATIC_ASSERT0 __extension__ _Static_assert #elif defined(__STDC_VERSION__) && RBIMPL_COMPILER_SINCE(GCC, 4, 6, 0) # define RBIMPL_STATIC_ASSERT0 __extension__ _Static_assert #elif defined(static_assert) # /* Take <assert.h> definition */ # define RBIMPL_STATIC_ASSERT0 static_assert #endif /** @endcond */ /** * @brief Wraps (or simulates) `static_assert` * @param name Valid C/C++ identifier, describing the assertion. * @param expr Expression to assert. * @note `name` shall not be a string literal. */ #if defined(__DOXYGEN__) # define RBIMPL_STATIC_ASSERT static_assert #elif defined(RBIMPL_STATIC_ASSERT0) # define RBIMPL_STATIC_ASSERT(name, expr) \ RBIMPL_STATIC_ASSERT0(expr, # name ": " # expr) #else # define RBIMPL_STATIC_ASSERT(name, expr) \ RBIMPL_ATTR_MAYBE_UNUSED() typedef int static_assert_ ## name ## _check[1 - 2 * !(expr)] #endif #endif /* RBIMPL_STATIC_ASSERT_H */