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/*
* Copyright (c) 2020 Gothel Software e.K.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef CPP_LANG_MACROS_HPP_
#define CPP_LANG_MACROS_HPP_
/**
* <code>constexpr</code> enabled for C++20.
*/
#if __cplusplus > 201703L
#define constexpr_cxx20 constexpr
#else
#define constexpr_cxx20
#endif
/**
* Used when designed to declare a function <code>constexpr</code>,
* but prohibited by its specific implementation.
* <p>
* Here it but uses non-literal variables, such as std::lock_guard etc.
* As these can't be evaluated at compile time, the standard does
* not allow using <code>constexpr</code> here.
* </p>
* <p>
* Empty until standard defines otherwise.
* </p>
*/
#define constexpr_non_literal_var
/**
* Used when designed to declare a function <code>constexpr</code>,
* but prohibited by its specific implementation.
* <p>
* Here it uses thread-safety related measures like atomic storage
* or mutex locks, which are non-literal variables and hence
* prohibit the use of <code>constexpr</code>.
* </p>
* @see constexpr_non_literal_var
*/
#define constexpr_atomic
/**
* Set define if RTTI is enabled during compilation,
* implying its runtime availability.
* <pre>
* - clang ('__clang__') may have '__has_feature(cxx_rtti)'
* - g++ ('__GNUC__') may have '__GXX_RTTI'
* - msvc (_MSC_VER) may have: '_CPPRTTI'
* </pre>
*/
#if defined(__clang__)
#if __has_feature(cxx_rtti)
#define __cxx_rtti_available__ 1
#endif
#else
#if defined(__GXX_RTTI) || defined(_CPPRTTI)
#define __cxx_rtti_available__ 1
#endif
#endif
#endif /* CPP_LANG_MACROS_HPP_ */
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