Chris@102: // Copyright (C) 2013 Vicente J. Botet Escriba
Chris@102: //
Chris@102: //  Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@102: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@102: //
Chris@102: // 2013/09 Vicente J. Botet Escriba
Chris@102: //    Adapt to boost from CCIA C++11 implementation
Chris@102: //    Make use of Boost.Move
Chris@102: 
Chris@102: #ifndef BOOST_THREAD_DETAIL_NULLARY_FUNCTION_HPP
Chris@102: #define BOOST_THREAD_DETAIL_NULLARY_FUNCTION_HPP
Chris@102: 
Chris@102: #include <boost/config.hpp>
Chris@102: #include <boost/thread/detail/memory.hpp>
Chris@102: #include <boost/thread/detail/move.hpp>
Chris@102: #include <boost/thread/csbl/memory/shared_ptr.hpp>
Chris@102: #include <boost/type_traits/decay.hpp>
Chris@102: 
Chris@102: namespace boost
Chris@102: {
Chris@102:   namespace detail
Chris@102:   {
Chris@102: 
Chris@102:     template <typename F>
Chris@102:     class nullary_function;
Chris@102:     template <>
Chris@102:     class nullary_function<void()>
Chris@102:     {
Chris@102:       struct impl_base
Chris@102:       {
Chris@102:         virtual void call()=0;
Chris@102:         virtual ~impl_base()
Chris@102:         {
Chris@102:         }
Chris@102:       };
Chris@102:       csbl::shared_ptr<impl_base> impl;
Chris@102:       template <typename F>
Chris@102:       struct impl_type: impl_base
Chris@102:       {
Chris@102:         F f;
Chris@102: #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
Chris@102:         impl_type(F &f_)
Chris@102:           : f(f_)
Chris@102:         {}
Chris@102: #endif
Chris@102:         impl_type(BOOST_THREAD_RV_REF(F) f_)
Chris@102:           : f(boost::move(f_))
Chris@102:         {}
Chris@102: 
Chris@102:         void call()
Chris@102:         {
Chris@102:           f();
Chris@102:         }
Chris@102:       };
Chris@102:       struct impl_type_ptr: impl_base
Chris@102:       {
Chris@102:         void (*f)();
Chris@102:         impl_type_ptr(void (*f_)())
Chris@102:           : f(f_)
Chris@102:         {}
Chris@102:         void call()
Chris@102:         {
Chris@102:           f();
Chris@102:         }
Chris@102:       };
Chris@102:     public:
Chris@102:       BOOST_THREAD_COPYABLE_AND_MOVABLE(nullary_function)
Chris@102: 
Chris@102:       explicit nullary_function(void (*f)()):
Chris@102:       impl(new impl_type_ptr(f))
Chris@102:       {}
Chris@102: 
Chris@102: #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
Chris@102:       template<typename F>
Chris@102:       explicit nullary_function(F& f):
Chris@102:       impl(new impl_type<F>(f))
Chris@102:       {}
Chris@102: #endif
Chris@102:       template<typename F>
Chris@102:       nullary_function(BOOST_THREAD_RV_REF(F) f):
Chris@102:       impl(new impl_type<typename decay<F>::type>(thread_detail::decay_copy(boost::forward<F>(f))))
Chris@102:       {}
Chris@102: 
Chris@102:       nullary_function()
Chris@102:         : impl()
Chris@102:       {
Chris@102:       }
Chris@102:       nullary_function(nullary_function const& other) BOOST_NOEXCEPT :
Chris@102:       impl(other.impl)
Chris@102:       {
Chris@102:       }
Chris@102:       nullary_function(BOOST_THREAD_RV_REF(nullary_function) other) BOOST_NOEXCEPT :
Chris@102: #if defined BOOST_NO_CXX11_SMART_PTR
Chris@102:       impl(BOOST_THREAD_RV(other).impl)
Chris@102:       {
Chris@102:         BOOST_THREAD_RV(other).impl.reset();
Chris@102:       }
Chris@102: #else
Chris@102:       impl(boost::move(other.impl))
Chris@102:       {
Chris@102:       }
Chris@102: #endif
Chris@102:       ~nullary_function()
Chris@102:       {
Chris@102:       }
Chris@102: 
Chris@102:       nullary_function& operator=(BOOST_THREAD_COPY_ASSIGN_REF(nullary_function) other) BOOST_NOEXCEPT
Chris@102:       {
Chris@102:         impl=other.impl;
Chris@102:         return *this;
Chris@102:       }
Chris@102:       nullary_function& operator=(BOOST_THREAD_RV_REF(nullary_function) other) BOOST_NOEXCEPT
Chris@102:       {
Chris@102: #if defined BOOST_NO_CXX11_SMART_PTR
Chris@102:         impl=BOOST_THREAD_RV(other).impl;
Chris@102:         BOOST_THREAD_RV(other).impl.reset();
Chris@102: #else
Chris@102:         impl = boost::move(other.impl);
Chris@102: #endif
Chris@102:         return *this;
Chris@102:       }
Chris@102: 
Chris@102: 
Chris@102:       void operator()()
Chris@102:       { if (impl) impl->call();}
Chris@102: 
Chris@102:     };
Chris@102: 
Chris@102:     template <typename R>
Chris@102:     class nullary_function<R()>
Chris@102:     {
Chris@102:       struct impl_base
Chris@102:       {
Chris@102:         virtual R call()=0;
Chris@102:         virtual ~impl_base()
Chris@102:         {
Chris@102:         }
Chris@102:       };
Chris@102:       csbl::shared_ptr<impl_base> impl;
Chris@102:       template <typename F>
Chris@102:       struct impl_type: impl_base
Chris@102:       {
Chris@102:         F f;
Chris@102: #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
Chris@102:         impl_type(F &f_)
Chris@102:           : f(f_)
Chris@102:         {}
Chris@102: #endif
Chris@102:         impl_type(BOOST_THREAD_RV_REF(F) f_)
Chris@102:           : f(boost::move(f_))
Chris@102:         {}
Chris@102: 
Chris@102:         R call()
Chris@102:         {
Chris@102:           return f();
Chris@102:         }
Chris@102:       };
Chris@102:       struct impl_type_ptr: impl_base
Chris@102:       {
Chris@102:         R (*f)();
Chris@102:         impl_type_ptr(R (*f_)())
Chris@102:           : f(f_)
Chris@102:         {}
Chris@102: 
Chris@102:         R call()
Chris@102:         {
Chris@102:           return f();
Chris@102:         }
Chris@102:       };
Chris@102:     public:
Chris@102:       BOOST_THREAD_COPYABLE_AND_MOVABLE(nullary_function)
Chris@102: 
Chris@102:       nullary_function(R (*f)()):
Chris@102:       impl(new impl_type_ptr(f))
Chris@102:       {}
Chris@102: #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
Chris@102:       template<typename F>
Chris@102:       nullary_function(F& f):
Chris@102:       impl(new impl_type<F>(f))
Chris@102:       {}
Chris@102: #endif
Chris@102:       template<typename F>
Chris@102:       nullary_function(BOOST_THREAD_RV_REF(F) f):
Chris@102:       impl(new impl_type<typename decay<F>::type>(thread_detail::decay_copy(boost::forward<F>(f))))
Chris@102:       {}
Chris@102: 
Chris@102:       nullary_function(nullary_function const& other) BOOST_NOEXCEPT :
Chris@102:       impl(other.impl)
Chris@102:       {
Chris@102:       }
Chris@102:       nullary_function(BOOST_THREAD_RV_REF(nullary_function) other) BOOST_NOEXCEPT :
Chris@102: #if defined BOOST_NO_CXX11_SMART_PTR
Chris@102:       impl(BOOST_THREAD_RV(other).impl)
Chris@102:       {
Chris@102:         BOOST_THREAD_RV(other).impl.reset();
Chris@102:       }
Chris@102: #else
Chris@102:       impl(boost::move(other.impl))
Chris@102:       {
Chris@102:       }
Chris@102: #endif
Chris@102:       nullary_function()
Chris@102:         : impl()
Chris@102:       {
Chris@102:       }
Chris@102:       ~nullary_function()
Chris@102:       {
Chris@102:       }
Chris@102: 
Chris@102:       nullary_function& operator=(BOOST_THREAD_COPY_ASSIGN_REF(nullary_function) other) BOOST_NOEXCEPT
Chris@102:       {
Chris@102:         impl=other.impl;
Chris@102:         return *this;
Chris@102:       }
Chris@102:       nullary_function& operator=(BOOST_THREAD_RV_REF(nullary_function) other) BOOST_NOEXCEPT
Chris@102:       {
Chris@102: #if defined BOOST_NO_CXX11_SMART_PTR
Chris@102:         impl=BOOST_THREAD_RV(other).impl;
Chris@102:         BOOST_THREAD_RV(other).impl.reset();
Chris@102: #else
Chris@102:         impl = boost::move(other.impl);
Chris@102: #endif
Chris@102:         return *this;
Chris@102:       }
Chris@102: 
Chris@102:       R operator()()
Chris@102:       { if (impl) return impl->call(); else return R();}
Chris@102: 
Chris@102:     };
Chris@102:   }
Chris@102:   //BOOST_THREAD_DCL_MOVABLE_BEG(F) detail::nullary_function<F> BOOST_THREAD_DCL_MOVABLE_END
Chris@102: }
Chris@102: 
Chris@102: #endif // header