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boost_smart_ptr/include/boost/smart_ptr/allocate_shared_array.hpp
Glen Fernandes 63a05a3576 Refactor make_array_helper and array_deleter 
Reduce the amount of code in allocate_array_helper, make_array_helper, and
array_deleter using the empty base class optimization technique.
2014-02-03 07:28:01 -08:00

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/*
* Copyright (c) 2012-2014 Glen Joseph Fernandes
* glenfe at live dot com
*
* Distributed under the Boost Software License,
* Version 1.0. (See accompanying file LICENSE_1_0.txt
* or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_SMART_PTR_ALLOCATE_SHARED_ARRAY_HPP
#define BOOST_SMART_PTR_ALLOCATE_SHARED_ARRAY_HPP
#include <boost/smart_ptr/detail/allocate_array_helper.hpp>
#include <boost/smart_ptr/detail/array_deleter.hpp>
#include <boost/smart_ptr/detail/sp_if_array.hpp>
#include <boost/type_traits/remove_cv.hpp>
namespace boost {
template<typename T, typename A>
inline typename boost::detail::sp_if_array<T>::type
allocate_shared(const A& allocator, std::size_t size) {
typedef typename boost::detail::array_inner<T>::type T1;
typedef typename boost::detail::array_base<T1>::type T2;
typedef typename boost::remove_cv<T2>::type T3;
T1* p1 = 0;
T3* p2 = 0;
std::size_t n1 = size * boost::detail::array_total<T1>::size;
boost::detail::allocate_array_helper<A, T3[]> a1(allocator, n1, &p2);
boost::detail::array_deleter<T3[]> d1(n1);
boost::shared_ptr<T> s1(p1, d1, a1);
typedef boost::detail::array_deleter<T3[]>* D2;
p1 = reinterpret_cast<T1*>(p2);
D2 d2 = static_cast<D2>(s1._internal_get_untyped_deleter());
d2->init(p2);
return boost::shared_ptr<T>(s1, p1);
}
template<typename T, typename A>
inline typename boost::detail::sp_if_size_array<T>::type
allocate_shared(const A& allocator) {
typedef typename boost::detail::array_inner<T>::type T1;
typedef typename boost::detail::array_base<T1>::type T2;
typedef typename boost::remove_cv<T2>::type T3;
enum {
N = boost::detail::array_total<T>::size
};
T1* p1 = 0;
T3* p2 = 0;
boost::detail::allocate_array_helper<A, T3[N]> a1(allocator, &p2);
boost::detail::array_deleter<T3[N]> d1;
boost::shared_ptr<T> s1(p1, d1, a1);
typedef boost::detail::array_deleter<T3[N]>* D2;
p1 = reinterpret_cast<T1*>(p2);
D2 d2 = static_cast<D2>(s1._internal_get_untyped_deleter());
d2->init(p2);
return boost::shared_ptr<T>(s1, p1);
}
template<typename T, typename A>
inline typename boost::detail::sp_if_array<T>::type
allocate_shared(const A& allocator, std::size_t size,
const typename boost::detail::array_inner<T>::type& value) {
typedef typename boost::detail::array_inner<T>::type T1;
typedef typename boost::detail::array_base<T1>::type T2;
typedef typename boost::remove_cv<T2>::type T3;
typedef const T2 T4;
enum {
M = boost::detail::array_total<T1>::size
};
T1* p1 = 0;
T3* p2 = 0;
T4* p3 = reinterpret_cast<T4*>(&value);
std::size_t n1 = M * size;
boost::detail::allocate_array_helper<A, T3[]> a1(allocator, n1, &p2);
boost::detail::array_deleter<T3[]> d1(n1);
boost::shared_ptr<T> s1(p1, d1, a1);
typedef boost::detail::array_deleter<T3[]>* D2;
p1 = reinterpret_cast<T1*>(p2);
D2 d2 = static_cast<D2>(s1._internal_get_untyped_deleter());
d2->template init<M>(p2, p3);
return boost::shared_ptr<T>(s1, p1);
}
template<typename T, typename A>
inline typename boost::detail::sp_if_size_array<T>::type
allocate_shared(const A& allocator,
const typename boost::detail::array_inner<T>::type& value) {
typedef typename boost::detail::array_inner<T>::type T1;
typedef typename boost::detail::array_base<T1>::type T2;
typedef typename boost::remove_cv<T2>::type T3;
typedef const T2 T4;
enum {
M = boost::detail::array_total<T1>::size,
N = boost::detail::array_total<T>::size
};
T1* p1 = 0;
T3* p2 = 0;
T4* p3 = reinterpret_cast<T4*>(&value);
boost::detail::allocate_array_helper<A, T3[N]> a1(allocator, &p2);
boost::detail::array_deleter<T3[N]> d1;
boost::shared_ptr<T> s1(p1, d1, a1);
typedef boost::detail::array_deleter<T3[N]>* D2;
p1 = reinterpret_cast<T1*>(p2);
D2 d2 = static_cast<D2>(s1._internal_get_untyped_deleter());
d2->template init<M>(p2, p3);
return boost::shared_ptr<T>(s1, p1);
}
template<typename T, typename A>
inline typename boost::detail::sp_if_array<T>::type
allocate_shared_noinit(const A& allocator, std::size_t size) {
typedef typename boost::detail::array_inner<T>::type T1;
typedef typename boost::detail::array_base<T1>::type T2;
typedef typename boost::remove_cv<T2>::type T3;
T1* p1 = 0;
T3* p2 = 0;
std::size_t n1 = size * boost::detail::array_total<T1>::size;
boost::detail::allocate_array_helper<A, T3[]> a1(allocator, n1, &p2);
boost::detail::array_deleter<T3[]> d1(n1);
boost::shared_ptr<T> s1(p1, d1, a1);
typedef boost::detail::array_deleter<T3[]>* D2;
p1 = reinterpret_cast<T1*>(p2);
D2 d2 = static_cast<D2>(s1._internal_get_untyped_deleter());
d2->noinit(p2);
return boost::shared_ptr<T>(s1, p1);
}
template<typename T, typename A>
inline typename boost::detail::sp_if_size_array<T>::type
allocate_shared_noinit(const A& allocator) {
typedef typename boost::detail::array_inner<T>::type T1;
typedef typename boost::detail::array_base<T1>::type T2;
typedef typename boost::remove_cv<T2>::type T3;
enum {
N = boost::detail::array_total<T>::size
};
T1* p1 = 0;
T3* p2 = 0;
boost::detail::allocate_array_helper<A, T3[N]> a1(allocator, &p2);
boost::detail::array_deleter<T3[N]> d1;
boost::shared_ptr<T> s1(p1, d1, a1);
typedef boost::detail::array_deleter<T3[N]>* D2;
p1 = reinterpret_cast<T1*>(p2);
D2 d2 = static_cast<D2>(s1._internal_get_untyped_deleter());
d2->noinit(p2);
return boost::shared_ptr<T>(s1, p1);
}
}
#endif
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