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with_lock_guard.hpp
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// (C) Copyright 2013 Ruslan Baratov // Copyright (C) 2014 Vicente J. Botet Escriba // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // See www.boost.org/libs/thread for documentation. #ifndef BOOST_THREAD_WITH_LOCK_GUARD_HPP #define BOOST_THREAD_WITH_LOCK_GUARD_HPP #include <boost/thread/lock_guard.hpp> #include <boost/utility/result_of.hpp> //#include <boost/thread/detail/invoke.hpp> namespace boost { #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && \ !defined(BOOST_NO_CXX11_DECLTYPE) && \ !defined(BOOST_NO_CXX11_TRAILING_RESULT_TYPES) /** * Utility to run functions in scope protected by mutex. * * Examples: * * int func(int, int&); * boost::mutex m; * int a; * int result = boost::with_lock_guard(m, func, 1, boost::ref(a)); * * // using boost::bind * int result = boost::with_lock_guard( * m, boost::bind(func, 2, boost::ref(a)) * ); * * // using lambda * int a; * int result = boost::with_lock_guard( * m, * [&a](int x) { * a = 3; * return x + 4; * }, * 5 * ); */ template <class Lockable, class Function, class... Args> typename boost::result_of<Function(Args...)>::type with_lock_guard( Lockable& m, BOOST_FWD_REF(Function) func, BOOST_FWD_REF(Args)... args ) //-> decltype(func(boost::forward<Args>(args)...)) { boost::lock_guard<Lockable> lock(m); return func(boost::forward<Args>(args)...); } #else // Workaround versions for compilers without c++11 variadic templates support. // (function arguments limit: 4) // (for lambda support define BOOST_RESULT_OF_USE_DECLTYPE may be needed) template <class Lockable, class Func> typename boost::result_of<Func()>::type with_lock_guard( Lockable& m, BOOST_FWD_REF(Func) func ) { boost::lock_guard<Lockable> lock(m); return func(); } template <class Lockable, class Func, class Arg> typename boost::result_of<Func(Arg)>::type with_lock_guard( Lockable& m, BOOST_FWD_REF(Func) func, BOOST_FWD_REF(Arg) arg ) { boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg>(arg) ); } template <class Lockable, class Func, class Arg1, class Arg2> typename boost::result_of<Func(Arg1, Arg2)>::type with_lock_guard( Lockable& m, BOOST_FWD_REF(Func) func, BOOST_FWD_REF(Arg1) arg1, BOOST_FWD_REF(Arg2) arg2 ) { boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg1>(arg1), boost::forward<Arg2>(arg2) ); } template <class Lockable, class Func, class Arg1, class Arg2, class Arg3> typename boost::result_of<Func(Arg1, Arg2, Arg3)>::type with_lock_guard( Lockable& m, BOOST_FWD_REF(Func) func, BOOST_FWD_REF(Arg1) arg1, BOOST_FWD_REF(Arg2) arg2, BOOST_FWD_REF(Arg3) arg3 ) { boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg1>(arg1), boost::forward<Arg2>(arg2), boost::forward<Arg3>(arg3) ); } template < class Lockable, class Func, class Arg1, class Arg2, class Arg3, class Arg4 > typename boost::result_of<Func(Arg1, Arg2, Arg3, Arg4)>::type with_lock_guard( Lockable& m, BOOST_FWD_REF(Func) func, BOOST_FWD_REF(Arg1) arg1, BOOST_FWD_REF(Arg2) arg2, BOOST_FWD_REF(Arg3) arg3, BOOST_FWD_REF(Arg4) arg4 ) { boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg1>(arg1), boost::forward<Arg2>(arg2), boost::forward<Arg3>(arg3), boost::forward<Arg4>(arg4) ); } // overloads for function pointer // (if argument is not function pointer, static assert will trigger) template <class Lockable, class Func> typename boost::result_of< typename boost::add_pointer<Func>::type() >::type with_lock_guard( Lockable& m, Func* func ) { BOOST_STATIC_ASSERT(boost::is_function<Func>::value); boost::lock_guard<Lockable> lock(m); return func(); } template <class Lockable, class Func, class Arg> typename boost::result_of< typename boost::add_pointer<Func>::type(Arg) >::type with_lock_guard( Lockable& m, Func* func, BOOST_FWD_REF(Arg) arg ) { BOOST_STATIC_ASSERT(boost::is_function<Func>::value); boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg>(arg) ); } template <class Lockable, class Func, class Arg1, class Arg2> typename boost::result_of< typename boost::add_pointer<Func>::type(Arg1, Arg2) >::type with_lock_guard( Lockable& m, Func* func, BOOST_FWD_REF(Arg1) arg1, BOOST_FWD_REF(Arg2) arg2 ) { BOOST_STATIC_ASSERT(boost::is_function<Func>::value); boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg1>(arg1), boost::forward<Arg2>(arg2) ); } template <class Lockable, class Func, class Arg1, class Arg2, class Arg3> typename boost::result_of< typename boost::add_pointer<Func>::type(Arg1, Arg2, Arg3) >::type with_lock_guard( Lockable& m, Func* func, BOOST_FWD_REF(Arg1) arg1, BOOST_FWD_REF(Arg2) arg2, BOOST_FWD_REF(Arg3) arg3 ) { BOOST_STATIC_ASSERT(boost::is_function<Func>::value); boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg1>(arg1), boost::forward<Arg2>(arg2), boost::forward<Arg3>(arg3) ); } template < class Lockable, class Func, class Arg1, class Arg2, class Arg3, class Arg4 > typename boost::result_of< typename boost::add_pointer<Func>::type(Arg1, Arg2, Arg3, Arg4) >::type with_lock_guard( Lockable& m, Func* func, BOOST_FWD_REF(Arg1) arg1, BOOST_FWD_REF(Arg2) arg2, BOOST_FWD_REF(Arg3) arg3, BOOST_FWD_REF(Arg4) arg4 ) { BOOST_STATIC_ASSERT(boost::is_function<Func>::value); boost::lock_guard<Lockable> lock(m); return func( boost::forward<Arg1>(arg1), boost::forward<Arg2>(arg2), boost::forward<Arg3>(arg3), boost::forward<Arg4>(arg4) ); } #endif } // namespace boost #endif // BOOST_THREAD_WITH_LOCK_GUARD_HPP