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Copy pathfactory.hpp
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214 lines (185 loc) · 7.04 KB
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/*=============================================================================
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 <boost/preprocessor/iteration/iterate.hpp>
# include <boost/preprocessor/repetition/enum_params.hpp>
# include <boost/preprocessor/repetition/enum_binary_params.hpp>
# include <boost/preprocessor/repetition/enum_trailing_params.hpp>
# include <new>
# include <boost/pointee.hpp>
# include <boost/get_pointer.hpp>
# include <boost/non_type.hpp>
# include <boost/type_traits/remove_cv.hpp>
# if defined(BOOST_FUNCTIONAL_FACTORY_SUPPORT_NONE_T)
# include <boost/none_t.hpp>
# endif
# 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 boost
{
enum factory_alloc_propagation
{
factory_alloc_for_pointee_and_deleter,
factory_passes_alloc_to_smart_pointer
};
#if defined(BOOST_FUNCTIONAL_FACTORY_SUPPORT_NONE_T)
template< typename Pointer, class Allocator = boost::none_t,
factory_alloc_propagation AP = factory_alloc_for_pointee_and_deleter >
class factory;
#else
template< typename Pointer, class Allocator = void,
factory_alloc_propagation AP = factory_alloc_for_pointee_and_deleter >
class factory;
#endif
//----- ---- --- -- - - - -
template< typename Pointer, factory_alloc_propagation AP >
class factory<Pointer, void, AP>
{
public:
typedef typename boost::remove_cv<Pointer>::type result_type;
typedef typename boost::pointee<result_type>::type value_type;
factory()
{ }
# define BOOST_PP_FILENAME_1 <boost/functional/factory.hpp>
# define BOOST_PP_ITERATION_LIMITS (0,BOOST_FUNCTIONAL_FACTORY_MAX_ARITY)
# include BOOST_PP_ITERATE()
};
#if defined(BOOST_FUNCTIONAL_FACTORY_SUPPORT_NONE_T)
template< typename Pointer, factory_alloc_propagation AP >
class factory<Pointer, boost::none_t, AP>
: public factory<Pointer, void, AP>
{};
#endif
template< class Pointer, class Allocator, factory_alloc_propagation AP >
class factory
#if defined(BOOST_NO_CXX11_ALLOCATOR)
: private Allocator::template rebind< typename boost::pointee<
typename boost::remove_cv<Pointer>::type >::type >::other
#else
: private std::allocator_traits<Allocator>::template rebind_alloc<
typename boost::pointee< typename boost::remove_cv<Pointer>::type >::type >
#endif
{
public:
typedef typename boost::remove_cv<Pointer>::type result_type;
typedef typename boost::pointee<result_type>::type value_type;
#if defined(BOOST_NO_CXX11_ALLOCATOR)
typedef typename Allocator::template rebind<value_type>::other
allocator_type;
#else
typedef typename std::allocator_traits<Allocator>::template rebind_alloc<value_type>
allocator_type;
typedef std::allocator_traits<allocator_type> allocator_traits;
#endif
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) {
#if defined(BOOST_NO_CXX11_ALLOCATOR)
ptr->~value_type();
const_cast<allocator_type*>(static_cast<allocator_type const*>(
this))->deallocate(ptr,1);
#else
allocator_traits::destroy(this->get_allocator(), ptr);
allocator_traits::deallocate(this->get_allocator(),ptr,1);
#endif
}
}
};
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, boost::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, boost::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 <boost/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
{
#if defined(BOOST_NO_CXX11_ALLOCATOR)
value_type* memory = this->get_allocator().allocate(1);
#else
value_type* memory = allocator_traits::allocate(this->get_allocator(), 1);
#endif
try
{
#if defined(BOOST_NO_CXX11_ALLOCATOR)
new(memory) value_type(BOOST_PP_ENUM_PARAMS(N,a));
#else
allocator_traits::construct(this->get_allocator(), memory
BOOST_PP_ENUM_TRAILING_PARAMS(N,a));
#endif
}
catch (...) {
#if defined(BOOST_NO_CXX11_ALLOCATOR)
this->get_allocator().deallocate(memory,1);
#else
allocator_traits::deallocate(this->get_allocator(), memory, 1);
#endif
throw;
}
return make_pointer(memory, boost::non_type<factory_alloc_propagation,AP>());
}
# endif
# undef N
# endif // defined(BOOST_PP_IS_ITERATING)
#endif // include guard