522 lines
15 KiB
C++
522 lines
15 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2015.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*/
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/*!
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* \file light_function.hpp
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* \author Andrey Semashev
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* \date 20.06.2010
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*
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* \brief This header is the Boost.Log library impl, see the library documentation
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* at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
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*
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* The file contains a lightweight alternative of Boost.Function. It does not provide all
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* features of Boost.Function but doesn't introduce dependency on Boost.Bind.
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*/
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#ifndef BOOST_LOG_DETAIL_LIGHT_FUNCTION_HPP_INCLUDED_
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#define BOOST_LOG_DETAIL_LIGHT_FUNCTION_HPP_INCLUDED_
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#include <cstddef>
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#include <boost/move/core.hpp>
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#include <boost/move/utility_core.hpp>
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#include <boost/log/detail/config.hpp>
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#include <boost/utility/explicit_operator_bool.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp>
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#endif
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#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#include <boost/log/detail/sfinae_tools.hpp>
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#else
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#include <boost/type_traits/remove_reference.hpp>
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#endif
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#if defined(BOOST_NO_CXX11_NULLPTR)
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#include <boost/assert.hpp>
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#endif
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#include <boost/log/detail/header.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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#pragma once
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#endif
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#ifndef BOOST_LOG_LIGHT_FUNCTION_LIMIT
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#define BOOST_LOG_LIGHT_FUNCTION_LIMIT 2
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#endif
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namespace boost {
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BOOST_LOG_OPEN_NAMESPACE
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namespace aux {
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#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template< typename T, typename ThisT >
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struct is_cv_same { enum _ { value = false }; };
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template< typename T >
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struct is_cv_same< T, T > { enum _ { value = true }; };
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template< typename T >
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struct is_cv_same< T, const T > { enum _ { value = true }; };
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template< typename T >
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struct is_cv_same< T, volatile T > { enum _ { value = true }; };
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template< typename T >
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struct is_cv_same< T, const volatile T > { enum _ { value = true }; };
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template< typename T, typename ThisT >
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struct is_rv_or_same { enum _ { value = false }; };
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template< typename T >
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struct is_rv_or_same< T, T > { enum _ { value = true }; };
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template< typename T, typename ThisT >
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struct is_rv_or_same< boost::rv< T >, ThisT > { enum _ { value = true }; };
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#endif
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template< typename SignatureT >
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class light_function;
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#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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template< typename ResultT, typename... ArgsT >
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class light_function< ResultT (ArgsT...) >
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{
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typedef light_function this_type;
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BOOST_COPYABLE_AND_MOVABLE(this_type)
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public:
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typedef ResultT result_type;
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private:
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struct impl_base
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{
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typedef result_type (*invoke_type)(void*, ArgsT...);
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const invoke_type invoke;
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typedef impl_base* (*clone_type)(const void*);
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const clone_type clone;
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typedef void (*destroy_type)(void*);
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const destroy_type destroy;
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impl_base(invoke_type inv, clone_type cl, destroy_type dstr) : invoke(inv), clone(cl), destroy(dstr)
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{
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}
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BOOST_DELETED_FUNCTION(impl_base(impl_base const&))
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BOOST_DELETED_FUNCTION(impl_base& operator= (impl_base const&))
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};
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#if !defined(BOOST_LOG_NO_MEMBER_TEMPLATE_FRIENDS)
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template< typename FunT >
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class impl;
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template< typename FunT >
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friend class impl;
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#endif
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template< typename FunT >
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class impl :
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public impl_base
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{
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typedef impl< FunT > this_type;
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FunT m_Function;
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public:
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explicit impl(FunT const& fun) :
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impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
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m_Function(fun)
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{
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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explicit impl(FunT&& fun) :
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impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
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m_Function(boost::move(fun))
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{
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}
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#endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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static void destroy_impl(void* self)
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{
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delete static_cast< impl* >(static_cast< impl_base* >(self));
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}
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static impl_base* clone_impl(const void* self)
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{
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return new impl(static_cast< const impl* >(static_cast< const impl_base* >(self))->m_Function);
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}
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static result_type invoke_impl(void* self, ArgsT... args)
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{
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return static_cast< impl* >(static_cast< impl_base* >(self))->m_Function(args...);
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}
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BOOST_DELETED_FUNCTION(impl(impl const&))
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BOOST_DELETED_FUNCTION(impl& operator= (impl const&))
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};
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private:
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impl_base* m_pImpl;
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public:
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BOOST_CONSTEXPR light_function() BOOST_NOEXCEPT : m_pImpl(NULL)
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{
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}
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light_function(this_type const& that)
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{
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if (that.m_pImpl)
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m_pImpl = that.m_pImpl->clone(that.m_pImpl);
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else
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m_pImpl = NULL;
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}
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light_function(BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
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{
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m_pImpl = that.m_pImpl;
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that.m_pImpl = NULL;
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}
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light_function(BOOST_RV_REF(const this_type) that) BOOST_NOEXCEPT
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{
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m_pImpl = that.m_pImpl;
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((this_type&)that).m_pImpl = NULL;
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template< typename FunT >
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light_function(FunT&& fun) :
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m_pImpl(new impl< typename remove_cv< typename remove_reference< FunT >::type >::type >(boost::forward< FunT >(fun)))
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{
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}
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#else
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template< typename FunT >
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light_function(FunT const& fun, typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) :
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m_pImpl(new impl< FunT >(fun))
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{
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}
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template< typename FunT >
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light_function(BOOST_RV_REF(FunT) fun, typename boost::disable_if_c< is_cv_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) :
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m_pImpl(new impl< typename remove_cv< FunT >::type >(fun))
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{
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}
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#endif
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//! Constructor from NULL
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#if !defined(BOOST_NO_CXX11_NULLPTR)
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BOOST_CONSTEXPR light_function(std::nullptr_t) BOOST_NOEXCEPT
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#else
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BOOST_CONSTEXPR light_function(int p) BOOST_NOEXCEPT
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#endif
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: m_pImpl(NULL)
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{
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#if defined(BOOST_NO_CXX11_NULLPTR)
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BOOST_ASSERT(p == 0);
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#endif
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}
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~light_function()
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{
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clear();
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}
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light_function& operator= (BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
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{
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this->swap(that);
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return *this;
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}
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light_function& operator= (BOOST_COPY_ASSIGN_REF(this_type) that)
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{
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light_function tmp = static_cast< this_type const& >(that);
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this->swap(tmp);
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return *this;
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}
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//! Assignment of NULL
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#if !defined(BOOST_NO_CXX11_NULLPTR)
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light_function& operator= (std::nullptr_t)
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#else
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light_function& operator= (int p)
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#endif
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{
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#if defined(BOOST_NO_CXX11_NULLPTR)
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BOOST_ASSERT(p == 0);
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#endif
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clear();
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return *this;
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template< typename FunT >
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light_function& operator= (FunT&& fun)
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{
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light_function tmp(boost::forward< FunT >(fun));
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this->swap(tmp);
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return *this;
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}
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#else
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template< typename FunT >
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typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, this_type& >::type
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operator= (FunT const& fun)
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{
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light_function tmp(fun);
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this->swap(tmp);
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return *this;
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}
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#endif
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result_type operator() (ArgsT... args) const
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{
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return m_pImpl->invoke(m_pImpl, args...);
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}
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BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
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bool operator! () const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
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bool empty() const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
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void clear() BOOST_NOEXCEPT
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{
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if (m_pImpl)
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{
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m_pImpl->destroy(m_pImpl);
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m_pImpl = NULL;
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}
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}
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void swap(this_type& that) BOOST_NOEXCEPT
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{
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impl_base* p = m_pImpl;
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m_pImpl = that.m_pImpl;
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that.m_pImpl = p;
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}
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};
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template< typename... ArgsT >
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class light_function< void (ArgsT...) >
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{
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typedef light_function this_type;
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BOOST_COPYABLE_AND_MOVABLE(this_type)
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public:
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typedef void result_type;
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private:
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struct impl_base
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{
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typedef void (*invoke_type)(void*, ArgsT...);
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const invoke_type invoke;
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typedef impl_base* (*clone_type)(const void*);
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const clone_type clone;
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typedef void (*destroy_type)(void*);
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const destroy_type destroy;
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impl_base(invoke_type inv, clone_type cl, destroy_type dstr) : invoke(inv), clone(cl), destroy(dstr)
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{
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}
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BOOST_DELETED_FUNCTION(impl_base(impl_base const&))
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BOOST_DELETED_FUNCTION(impl_base& operator= (impl_base const&))
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};
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#if !defined(BOOST_LOG_NO_MEMBER_TEMPLATE_FRIENDS)
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template< typename FunT >
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class impl;
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template< typename FunT >
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friend class impl;
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#endif
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template< typename FunT >
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class impl :
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public impl_base
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{
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typedef impl< FunT > this_type;
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FunT m_Function;
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public:
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explicit impl(FunT const& fun) :
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impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
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m_Function(fun)
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{
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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explicit impl(FunT&& fun) :
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impl_base(&this_type::invoke_impl, &this_type::clone_impl, &this_type::destroy_impl),
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m_Function(boost::move(fun))
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{
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}
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#endif // !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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static void destroy_impl(void* self)
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{
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delete static_cast< impl* >(static_cast< impl_base* >(self));
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}
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static impl_base* clone_impl(const void* self)
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{
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return new impl(static_cast< const impl* >(static_cast< const impl_base* >(self))->m_Function);
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}
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static result_type invoke_impl(void* self, ArgsT... args)
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{
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static_cast< impl* >(static_cast< impl_base* >(self))->m_Function(args...);
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}
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BOOST_DELETED_FUNCTION(impl(impl const&))
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BOOST_DELETED_FUNCTION(impl& operator= (impl const&))
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};
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private:
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impl_base* m_pImpl;
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public:
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BOOST_CONSTEXPR light_function() BOOST_NOEXCEPT : m_pImpl(NULL)
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{
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}
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light_function(this_type const& that)
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{
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if (that.m_pImpl)
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m_pImpl = that.m_pImpl->clone(that.m_pImpl);
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else
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m_pImpl = NULL;
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}
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light_function(BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
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{
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m_pImpl = that.m_pImpl;
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that.m_pImpl = NULL;
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}
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light_function(BOOST_RV_REF(const this_type) that) BOOST_NOEXCEPT
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{
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m_pImpl = that.m_pImpl;
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((this_type&)that).m_pImpl = NULL;
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template< typename FunT >
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light_function(FunT&& fun) :
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m_pImpl(new impl< typename remove_cv< typename remove_reference< FunT >::type >::type >(boost::forward< FunT >(fun)))
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{
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}
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#else
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template< typename FunT >
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light_function(FunT const& fun, typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) :
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m_pImpl(new impl< FunT >(fun))
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{
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}
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template< typename FunT >
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light_function(BOOST_RV_REF(FunT) fun, typename boost::disable_if_c< is_cv_same< FunT, this_type >::value, boost::log::aux::sfinae_dummy >::type = boost::log::aux::sfinae_dummy()) :
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m_pImpl(new impl< typename remove_cv< FunT >::type >(fun))
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{
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}
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#endif
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//! Constructor from NULL
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#if !defined(BOOST_NO_CXX11_NULLPTR)
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BOOST_CONSTEXPR light_function(std::nullptr_t) BOOST_NOEXCEPT
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#else
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BOOST_CONSTEXPR light_function(int p) BOOST_NOEXCEPT
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#endif
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: m_pImpl(NULL)
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{
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#if defined(BOOST_NO_CXX11_NULLPTR)
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BOOST_ASSERT(p == 0);
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#endif
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}
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~light_function()
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{
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clear();
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}
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light_function& operator= (BOOST_RV_REF(this_type) that) BOOST_NOEXCEPT
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{
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this->swap(that);
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return *this;
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}
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light_function& operator= (BOOST_COPY_ASSIGN_REF(this_type) that)
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{
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light_function tmp = static_cast< this_type const& >(that);
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this->swap(tmp);
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return *this;
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}
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//! Assignment of NULL
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#if !defined(BOOST_NO_CXX11_NULLPTR)
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light_function& operator= (std::nullptr_t)
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#else
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light_function& operator= (int p)
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#endif
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{
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#if defined(BOOST_NO_CXX11_NULLPTR)
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BOOST_ASSERT(p == 0);
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#endif
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clear();
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return *this;
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template< typename FunT >
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light_function& operator= (FunT&& fun)
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{
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light_function tmp(boost::forward< FunT >(fun));
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this->swap(tmp);
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return *this;
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}
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#else
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template< typename FunT >
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typename boost::disable_if_c< is_rv_or_same< FunT, this_type >::value, this_type& >::type
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operator= (FunT const& fun)
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{
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light_function tmp(fun);
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this->swap(tmp);
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return *this;
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}
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#endif
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result_type operator() (ArgsT... args) const
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{
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m_pImpl->invoke(m_pImpl, args...);
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}
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BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
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bool operator! () const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
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bool empty() const BOOST_NOEXCEPT { return (m_pImpl == NULL); }
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void clear() BOOST_NOEXCEPT
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{
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if (m_pImpl)
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{
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m_pImpl->destroy(m_pImpl);
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m_pImpl = NULL;
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}
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}
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void swap(this_type& that) BOOST_NOEXCEPT
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{
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impl_base* p = m_pImpl;
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m_pImpl = that.m_pImpl;
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that.m_pImpl = p;
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}
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};
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#else // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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#define BOOST_PP_FILENAME_1 <boost/log/detail/light_function_pp.hpp>
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#define BOOST_PP_ITERATION_LIMITS (0, BOOST_LOG_LIGHT_FUNCTION_LIMIT)
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#include BOOST_PP_ITERATE()
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#endif // !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
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template< typename SignatureT >
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inline void swap(light_function< SignatureT >& left, light_function< SignatureT >& right)
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{
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left.swap(right);
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}
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} // namespace aux
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BOOST_LOG_CLOSE_NAMESPACE // namespace log
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} // namespace boost
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#include <boost/log/detail/footer.hpp>
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#endif // BOOST_LOG_DETAIL_LIGHT_FUNCTION_HPP_INCLUDED_
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