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Assertions in header files slows down an interpreter, so they should be turned off by default (simple `make`). To enable them, define a macro `RUBY_DEBUG=1` (e.g. `make cppflags=-DRUBY_DEBUG` or use `#define` at the very beggining of the file. Note that even if `NDEBUG=1` is defined, `RUBY_DEBUG=1` enables all assertions. [Feature #16837] related: https://github.com/ruby/ruby/pull/3120 `assert()` lines in MRI *.c is not disabled even if `RUBY_DEBUG=0` and it can be disabled with `NDEBUG=1`. So please consider to use `RUBY_ASSERT()` if you want to disable them when `RUBY_DEBUG=0`.
85 lines
3.5 KiB
C++
85 lines
3.5 KiB
C++
#ifndef RBIMPL_ATTR_CONSTEXPR_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_ATTR_CONSTEXPR_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief #RBIMPL_ATTR_CONSTEXPR.
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*/
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#include "ruby/internal/has/feature.h"
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#include "ruby/internal/compiler_is.h"
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#include "ruby/internal/token_paste.h"
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/** @cond INTERNAL_MACRO */
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#if ! defined(__cplusplus)
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# /* Makes no sense. */
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0
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#elif defined(__cpp_constexpr)
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# /* https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations */
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cpp_constexpr >= 200704L)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cpp_constexpr >= 201304L)
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#elif RBIMPL_COMPILER_SINCE(MSVC, 19, 0, 0)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 RBIMPL_COMPILER_SINCE(MSVC, 19, 00, 00)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 RBIMPL_COMPILER_SINCE(MSVC, 19, 11, 00)
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#elif RBIMPL_COMPILER_SINCE(SunPro, 5, 13, 0)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L)
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#elif RBIMPL_COMPILER_SINCE(GCC, 4, 9, 0)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L)
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#elif RBIMPL_HAS_FEATURE(cxx_relaxed_constexpr)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 1
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#elif RBIMPL_HAS_FEATURE(cxx_constexpr)
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0
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#else
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# /* :FIXME: icpc must have constexpr but don't know how to detect. */
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0
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# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0
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#endif
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/** @endcond */
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/** Wraps (or simulates) C++11 `constexpr`. */
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#if RBIMPL_HAS_ATTR_CONSTEXPR_CXX14
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# define RBIMPL_ATTR_CONSTEXPR(_) constexpr
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#elif RBIMPL_HAS_ATTR_CONSTEXPR_CXX11
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# define RBIMPL_ATTR_CONSTEXPR(_) RBIMPL_TOKEN_PASTE(RBIMPL_ATTR_CONSTEXPR_, _)
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# define RBIMPL_ATTR_CONSTEXPR_CXX11 constexpr
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# define RBIMPL_ATTR_CONSTEXPR_CXX14 /* void */
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#else
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# define RBIMPL_ATTR_CONSTEXPR(_) /* void */
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#endif
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/** Enables #RBIMPL_ATTR_CONSTEXPR iff. !RUBY_DEBUG. */
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#if !RUBY_DEBUG
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# define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) RBIMPL_ATTR_CONSTEXPR(_)
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#else
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# define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) /* void */
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#endif
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#endif /* RBIMPL_ATTR_CONSTEXPR_H */
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