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/*
Copyright 2017 Glen Joseph Fernandes
(glenjofe@gmail.com)
Distributed under the Boost Software License, Version 1.0.
(http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_SMART_PTR_ALLOCATE_LOCAL_SHARED_ARRAY_HPP
#define BOOST_SMART_PTR_ALLOCATE_LOCAL_SHARED_ARRAY_HPP
#include <boost/smart_ptr/allocate_shared_array.hpp>
#include <boost/smart_ptr/local_shared_ptr.hpp>
namespace boost {
namespace detail {
template<class>
struct lsp_if_array { };
template<class T>
struct lsp_if_array<T[]> {
typedef boost::local_shared_ptr<T[]> type;
};
template<class>
struct lsp_if_size_array { };
template<class T, std::size_t N>
struct lsp_if_size_array<T[N]> {
typedef boost::local_shared_ptr<T[N]> type;
};
class lsp_array_base
: public local_counted_base {
public:
void set(sp_counted_base* base) BOOST_SP_NOEXCEPT {
count_ = shared_count(base);
}
virtual void local_cb_destroy() BOOST_SP_NOEXCEPT {
shared_count().swap(count_);
}
virtual shared_count local_cb_get_shared_count() const BOOST_SP_NOEXCEPT {
return count_;
}
private:
shared_count count_;
};
template<class A>
class lsp_array_state
: public sp_array_state<A> {
public:
template<class U>
lsp_array_state(const U& other, std::size_t size) BOOST_SP_NOEXCEPT
: sp_array_state<A>(other, size) { }
lsp_array_base& base() BOOST_SP_NOEXCEPT {
return base_;
}
private:
lsp_array_base base_;
};
template<class A, std::size_t N>
class lsp_size_array_state
: public sp_size_array_state<A, N> {
public:
template<class U>
lsp_size_array_state(const U& other, std::size_t size) BOOST_SP_NOEXCEPT
: sp_size_array_state<A, N>(other, size) { }
lsp_array_base& base() BOOST_SP_NOEXCEPT {
return base_;
}
private:
lsp_array_base base_;
};
} /* detail */
template<class T, class A>
inline typename detail::lsp_if_array<T>::type
allocate_local_shared(const A& allocator, std::size_t count)
{
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef typename detail::sp_bind_allocator<A, scalar>::type other;
typedef detail::lsp_array_state<other> state;
typedef detail::sp_array_base<state> base;
std::size_t size = count * detail::sp_array_count<type>::value;
detail::sp_array_result<other, base> result(allocator, size);
base* node = result.get();
scalar* start = detail::sp_array_start<base, scalar>(node);
::new(static_cast<void*>(node)) base(allocator, size, start);
detail::lsp_array_base& local = node->state().base();
local.set(node);
result.release();
return local_shared_ptr<T>(detail::lsp_internal_constructor_tag(),
reinterpret_cast<type*>(start), &local);
}
template<class T, class A>
inline typename detail::lsp_if_size_array<T>::type
allocate_local_shared(const A& allocator)
{
enum {
size = detail::sp_array_count<T>::value
};
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef typename detail::sp_bind_allocator<A, scalar>::type other;
typedef detail::lsp_size_array_state<other, size> state;
typedef detail::sp_array_base<state> base;
detail::sp_array_result<other, base> result(allocator, size);
base* node = result.get();
scalar* start = detail::sp_array_start<base, scalar>(node);
::new(static_cast<void*>(node)) base(allocator, size, start);
detail::lsp_array_base& local = node->state().base();
local.set(node);
result.release();
return local_shared_ptr<T>(detail::lsp_internal_constructor_tag(),
reinterpret_cast<type*>(start), &local);
}
template<class T, class A>
inline typename detail::lsp_if_array<T>::type
allocate_local_shared(const A& allocator, std::size_t count,
const typename detail::sp_array_element<T>::type& value)
{
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef typename detail::sp_bind_allocator<A, scalar>::type other;
typedef detail::lsp_array_state<other> state;
typedef detail::sp_array_base<state> base;
std::size_t size = count * detail::sp_array_count<type>::value;
detail::sp_array_result<other, base> result(allocator, size);
base* node = result.get();
scalar* start = detail::sp_array_start<base, scalar>(node);
::new(static_cast<void*>(node)) base(allocator, size,
reinterpret_cast<const scalar*>(&value),
detail::sp_array_count<type>::value, start);
detail::lsp_array_base& local = node->state().base();
local.set(node);
result.release();
return local_shared_ptr<T>(detail::lsp_internal_constructor_tag(),
reinterpret_cast<type*>(start), &local);
}
template<class T, class A>
inline typename detail::lsp_if_size_array<T>::type
allocate_local_shared(const A& allocator,
const typename detail::sp_array_element<T>::type& value)
{
enum {
size = detail::sp_array_count<T>::value
};
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef typename detail::sp_bind_allocator<A, scalar>::type other;
typedef detail::lsp_size_array_state<other, size> state;
typedef detail::sp_array_base<state> base;
detail::sp_array_result<other, base> result(allocator, size);
base* node = result.get();
scalar* start = detail::sp_array_start<base, scalar>(node);
::new(static_cast<void*>(node)) base(allocator, size,
reinterpret_cast<const scalar*>(&value),
detail::sp_array_count<type>::value, start);
detail::lsp_array_base& local = node->state().base();
local.set(node);
result.release();
return local_shared_ptr<T>(detail::lsp_internal_constructor_tag(),
reinterpret_cast<type*>(start), &local);
}
template<class T, class A>
inline typename detail::lsp_if_array<T>::type
allocate_local_shared_noinit(const A& allocator, std::size_t count)
{
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef typename detail::sp_bind_allocator<A, scalar>::type other;
typedef detail::lsp_array_state<other> state;
typedef detail::sp_array_base<state, false> base;
std::size_t size = count * detail::sp_array_count<type>::value;
detail::sp_array_result<other, base> result(allocator, size);
base* node = result.get();
scalar* start = detail::sp_array_start<base, scalar>(node);
::new(static_cast<void*>(node)) base(detail::sp_default(), allocator,
size, start);
detail::lsp_array_base& local = node->state().base();
local.set(node);
result.release();
return local_shared_ptr<T>(detail::lsp_internal_constructor_tag(),
reinterpret_cast<type*>(start), &local);
}
template<class T, class A>
inline typename detail::lsp_if_size_array<T>::type
allocate_local_shared_noinit(const A& allocator)
{
enum {
size = detail::sp_array_count<T>::value
};
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef typename detail::sp_bind_allocator<A, scalar>::type other;
typedef detail::lsp_size_array_state<other, size> state;
typedef detail::sp_array_base<state, false> base;
detail::sp_array_result<other, base> result(allocator, size);
base* node = result.get();
scalar* start = detail::sp_array_start<base, scalar>(node);
::new(static_cast<void*>(node)) base(detail::sp_default(), allocator,
size, start);
detail::lsp_array_base& local = node->state().base();
local.set(node);
result.release();
return local_shared_ptr<T>(detail::lsp_internal_constructor_tag(),
reinterpret_cast<type*>(start), &local);
}
} /* boost */
#endif
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