| /*============================================================================= |
| Copyright (c) 2007 Tobias Schwinger |
| |
| Use modification and distribution are subject to 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). |
| ==============================================================================*/ |
| |
| #ifndef BOOST_FUNCTIONAL_FACTORY_HPP_INCLUDED |
| # ifndef BOOST_PP_IS_ITERATING |
| |
| # include <ndnboost/preprocessor/iteration/iterate.hpp> |
| # include <ndnboost/preprocessor/repetition/enum_params.hpp> |
| # include <ndnboost/preprocessor/repetition/enum_binary_params.hpp> |
| |
| # include <new> |
| # include <ndnboost/pointee.hpp> |
| # include <ndnboost/none_t.hpp> |
| # include <ndnboost/get_pointer.hpp> |
| # include <ndnboost/non_type.hpp> |
| # include <ndnboost/type_traits/remove_cv.hpp> |
| |
| # ifndef BOOST_FUNCTIONAL_FACTORY_MAX_ARITY |
| # define BOOST_FUNCTIONAL_FACTORY_MAX_ARITY 10 |
| # elif BOOST_FUNCTIONAL_FACTORY_MAX_ARITY < 3 |
| # undef BOOST_FUNCTIONAL_FACTORY_MAX_ARITY |
| # define BOOST_FUNCTIONAL_FACTORY_MAX_ARITY 3 |
| # endif |
| |
| namespace ndnboost |
| { |
| enum factory_alloc_propagation |
| { |
| factory_alloc_for_pointee_and_deleter, |
| factory_passes_alloc_to_smart_pointer |
| }; |
| |
| template< typename Pointer, class Allocator = ndnboost::none_t, |
| factory_alloc_propagation AP = factory_alloc_for_pointee_and_deleter > |
| class factory; |
| |
| //----- ---- --- -- - - - - |
| |
| template< typename Pointer, factory_alloc_propagation AP > |
| class factory<Pointer, ndnboost::none_t, AP> |
| { |
| public: |
| typedef typename ndnboost::remove_cv<Pointer>::type result_type; |
| typedef typename ndnboost::pointee<result_type>::type value_type; |
| |
| factory() |
| { } |
| |
| # define BOOST_PP_FILENAME_1 <ndnboost/functional/factory.hpp> |
| # define BOOST_PP_ITERATION_LIMITS (0,BOOST_FUNCTIONAL_FACTORY_MAX_ARITY) |
| # include BOOST_PP_ITERATE() |
| }; |
| |
| template< class Pointer, class Allocator, factory_alloc_propagation AP > |
| class factory |
| : private Allocator::template rebind< typename ndnboost::pointee< |
| typename ndnboost::remove_cv<Pointer>::type >::type >::other |
| { |
| public: |
| typedef typename ndnboost::remove_cv<Pointer>::type result_type; |
| typedef typename ndnboost::pointee<result_type>::type value_type; |
| |
| typedef typename Allocator::template rebind<value_type>::other |
| allocator_type; |
| |
| explicit factory(allocator_type const & a = allocator_type()) |
| : allocator_type(a) |
| { } |
| |
| private: |
| |
| struct deleter |
| : allocator_type |
| { |
| inline deleter(allocator_type const& that) |
| : allocator_type(that) |
| { } |
| |
| allocator_type& get_allocator() const |
| { |
| return *const_cast<allocator_type*>( |
| static_cast<allocator_type const*>(this)); |
| } |
| |
| void operator()(value_type* ptr) const |
| { |
| if (!! ptr) ptr->~value_type(); |
| const_cast<allocator_type*>(static_cast<allocator_type const*>( |
| this))->deallocate(ptr,1); |
| } |
| }; |
| |
| inline allocator_type& get_allocator() const |
| { |
| return *const_cast<allocator_type*>( |
| static_cast<allocator_type const*>(this)); |
| } |
| |
| inline result_type make_pointer(value_type* ptr, ndnboost::non_type< |
| factory_alloc_propagation,factory_passes_alloc_to_smart_pointer>) |
| const |
| { |
| return result_type(ptr,deleter(this->get_allocator())); |
| } |
| inline result_type make_pointer(value_type* ptr, ndnboost::non_type< |
| factory_alloc_propagation,factory_alloc_for_pointee_and_deleter>) |
| const |
| { |
| return result_type(ptr,deleter(this->get_allocator()), |
| this->get_allocator()); |
| } |
| |
| public: |
| |
| # define BOOST_TMP_MACRO |
| # define BOOST_PP_FILENAME_1 <ndnboost/functional/factory.hpp> |
| # define BOOST_PP_ITERATION_LIMITS (0,BOOST_FUNCTIONAL_FACTORY_MAX_ARITY) |
| # include BOOST_PP_ITERATE() |
| # undef BOOST_TMP_MACRO |
| }; |
| |
| template< typename Pointer, class Allocator, factory_alloc_propagation AP > |
| class factory<Pointer&, Allocator, AP>; |
| // forbidden, would create a dangling reference |
| } |
| |
| # define BOOST_FUNCTIONAL_FACTORY_HPP_INCLUDED |
| # else // defined(BOOST_PP_IS_ITERATING) |
| # define N BOOST_PP_ITERATION() |
| # if !defined(BOOST_TMP_MACRO) |
| # if N > 0 |
| template< BOOST_PP_ENUM_PARAMS(N, typename T) > |
| # endif |
| inline result_type operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& a)) const |
| { |
| return result_type( new value_type(BOOST_PP_ENUM_PARAMS(N,a)) ); |
| } |
| # else // defined(BOOST_TMP_MACRO) |
| # if N > 0 |
| template< BOOST_PP_ENUM_PARAMS(N, typename T) > |
| # endif |
| inline result_type operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& a)) const |
| { |
| value_type* memory = this->get_allocator().allocate(1); |
| try |
| { |
| return make_pointer( |
| new(memory) value_type(BOOST_PP_ENUM_PARAMS(N,a)), |
| ndnboost::non_type<factory_alloc_propagation,AP>() ); |
| } |
| catch (...) { this->get_allocator().deallocate(memory,1); throw; } |
| } |
| # endif |
| # undef N |
| # endif // defined(BOOST_PP_IS_ITERATING) |
| |
| #endif // include guard |
| |