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* Copyright (c) 2019 Haivision Systems Inc.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* License, v.2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*/
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/*****************************************************************************
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The file contains various planform and compiler dependent attribute definitions
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used by SRT library internally.
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1. Attributes for thread safety analysis
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- Clang (https://clang.llvm.org/docs/ThreadSafetyAnalysis.html#mutexheader).
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- Other compilers: none.
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*****************************************************************************/
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#ifndef INC_SRT_ATTR_DEFS_H
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#define INC_SRT_ATTR_DEFS_H
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// ATTRIBUTES:
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//
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// SRT_ATR_UNUSED: declare an entity ALLOWED to be unused (prevents warnings)
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// ATR_DEPRECATED: declare an entity deprecated (compiler should warn when used)
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// ATR_NOEXCEPT: The true `noexcept` from C++11, or nothing if compiling in pre-C++11 mode
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// ATR_NOTHROW: In C++11: `noexcept`. In pre-C++11: `throw()`. Required for GNU libstdc++.
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// ATR_CONSTEXPR: In C++11: `constexpr`. Otherwise empty.
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// ATR_OVERRIDE: In C++11: `override`. Otherwise empty.
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// ATR_FINAL: In C++11: `final`. Otherwise empty.
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#ifdef __GNUG__
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#define ATR_DEPRECATED __attribute__((deprecated))
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#else
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#define ATR_DEPRECATED
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#endif
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#if defined(__cplusplus) && __cplusplus > 199711L
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#define HAVE_CXX11 1
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// For gcc 4.7, claim C++11 is supported, as long as experimental C++0x is on,
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// however it's only the "most required C++11 support".
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#if defined(__GXX_EXPERIMENTAL_CXX0X__) && __GNUC__ == 4 && __GNUC_MINOR__ >= 7 // 4.7 only!
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#define ATR_NOEXCEPT
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#define ATR_NOTHROW throw()
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#define ATR_CONSTEXPR
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#define ATR_OVERRIDE
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#define ATR_FINAL
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#else
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#define HAVE_FULL_CXX11 1
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#define ATR_NOEXCEPT noexcept
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#define ATR_NOTHROW noexcept
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#define ATR_CONSTEXPR constexpr
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#define ATR_OVERRIDE override
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#define ATR_FINAL final
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#endif
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#elif defined(_MSC_VER) && _MSC_VER >= 1800
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// Microsoft Visual Studio supports C++11, but not fully,
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// and still did not change the value of __cplusplus. Treat
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// this special way.
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// _MSC_VER == 1800 means Microsoft Visual Studio 2013.
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#define HAVE_CXX11 1
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#if defined(_MSC_FULL_VER) && _MSC_FULL_VER >= 190023026
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#define HAVE_FULL_CXX11 1
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#define ATR_NOEXCEPT noexcept
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#define ATR_NOTHROW noexcept
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#define ATR_CONSTEXPR constexpr
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#define ATR_OVERRIDE override
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#define ATR_FINAL final
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#else
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#define ATR_NOEXCEPT
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#define ATR_NOTHROW throw()
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#define ATR_CONSTEXPR
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#define ATR_OVERRIDE
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#define ATR_FINAL
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#endif
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#else
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#define HAVE_CXX11 0
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#define ATR_NOEXCEPT
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#define ATR_NOTHROW throw()
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#define ATR_CONSTEXPR
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#define ATR_OVERRIDE
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#define ATR_FINAL
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#endif // __cplusplus
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#if !HAVE_CXX11 && defined(REQUIRE_CXX11) && REQUIRE_CXX11 == 1
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#error "The currently compiled application required C++11, but your compiler doesn't support it."
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#endif
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///////////////////////////////////////////////////////////////////////////////
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// Attributes for thread safety analysis
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// - Clang TSA (https://clang.llvm.org/docs/ThreadSafetyAnalysis.html#mutexheader).
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// - MSVC SAL (partially).
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// - Other compilers: none.
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///////////////////////////////////////////////////////////////////////////////
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#if _MSC_VER >= 1920
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// In case of MSVC these attributes have to preceed the attributed objects (variable, function).
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// E.g. SRT_ATTR_GUARDED_BY(mtx) int object;
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