boost/smart_ptr/allocate_shared_array.hpp
/*
Copyright 2012-2017 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_SHARED_ARRAY_HPP
#define BOOST_SMART_PTR_ALLOCATE_SHARED_ARRAY_HPP
#include <boost/smart_ptr/shared_ptr.hpp>
#include <boost/type_traits/has_trivial_constructor.hpp>
#include <boost/type_traits/has_trivial_destructor.hpp>
#include <boost/type_traits/alignment_of.hpp>
#include <boost/type_traits/type_with_alignment.hpp>
namespace boost {
namespace detail {
template<class>
struct sp_if_array { };
template<class T>
struct sp_if_array<T[]> {
typedef boost::shared_ptr<T[]> type;
};
template<class>
struct sp_if_size_array { };
template<class T, std::size_t N>
struct sp_if_size_array<T[N]> {
typedef boost::shared_ptr<T[N]> type;
};
template<class>
struct sp_array_element { };
template<class T>
struct sp_array_element<T[]> {
typedef T type;
};
template<class T, std::size_t N>
struct sp_array_element<T[N]> {
typedef T type;
};
template<class T>
struct sp_array_scalar {
typedef T type;
};
template<class T, std::size_t N>
struct sp_array_scalar<T[N]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T, std::size_t N>
struct sp_array_scalar<const T[N]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T, std::size_t N>
struct sp_array_scalar<volatile T[N]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T, std::size_t N>
struct sp_array_scalar<const volatile T[N]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T>
struct sp_array_scalar<T[]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T>
struct sp_array_scalar<const T[]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T>
struct sp_array_scalar<volatile T[]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T>
struct sp_array_scalar<const volatile T[]> {
typedef typename sp_array_scalar<T>::type type;
};
template<class T>
struct sp_array_count {
enum {
value = 1
};
};
template<class T, std::size_t N>
struct sp_array_count<T[N]> {
enum {
value = N * sp_array_count<T>::value
};
};
template<class T>
struct sp_array_count<T[]> { };
template<class D, class T>
inline D*
sp_get_deleter(const
boost::shared_ptr<T>& value) BOOST_NOEXCEPT_OR_NOTHROW
{
return static_cast<D*>(value._internal_get_untyped_deleter());
}
template<std::size_t N, std::size_t A>
struct sp_array_storage {
union type {
char value[N];
typename boost::type_with_alignment<A>::type other;
};
};
template<std::size_t N, std::size_t M>
struct sp_max_size {
enum {
value = N < M ? M : N
};
};
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
template<class A, class T>
struct sp_bind_allocator {
typedef typename std::allocator_traits<A>::template
rebind_alloc<T> type;
};
#else
template<class A, class T>
struct sp_bind_allocator {
typedef typename A::template rebind<T>::other type;
};
#endif
template<bool, class = void>
struct sp_enable { };
template<class T>
struct sp_enable<true, T> {
typedef T type;
};
template<class T>
inline
typename sp_enable<boost::has_trivial_destructor<T>::value>::type
sp_array_destroy(T*, std::size_t) BOOST_NOEXCEPT { }
template<class T>
inline
typename sp_enable<!boost::has_trivial_destructor<T>::value>::type
sp_array_destroy(T* storage, std::size_t size)
{
while (size > 0) {
storage[--size].~T();
}
}
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
template<class A, class T>
inline void
sp_array_destroy(A& allocator, T* storage, std::size_t size)
{
while (size > 0) {
std::allocator_traits<A>::destroy(allocator, &storage[--size]);
}
}
#endif
#if !defined(BOOST_NO_EXCEPTIONS)
template<class T>
inline
typename sp_enable<boost::has_trivial_constructor<T>::value ||
boost::has_trivial_destructor<T>::value>::type
sp_array_construct(T* storage, std::size_t size)
{
for (std::size_t i = 0; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T();
}
}
template<class T>
inline
typename sp_enable<!boost::has_trivial_constructor<T>::value &&
!boost::has_trivial_destructor<T>::value>::type
sp_array_construct(T* storage, std::size_t size)
{
std::size_t i = 0;
try {
for (; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T();
}
} catch (...) {
while (i > 0) {
storage[--i].~T();
}
throw;
}
}
template<class T>
inline void
sp_array_construct(T* storage, std::size_t size, const T* list,
std::size_t count)
{
std::size_t i = 0;
try {
for (; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T(list[i % count]);
}
} catch (...) {
while (i > 0) {
storage[--i].~T();
}
throw;
}
}
#else
template<class T>
inline void
sp_array_construct(T* storage, std::size_t size)
{
for (std::size_t i = 0; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T();
}
}
template<class T>
inline void
sp_array_construct(T* storage, std::size_t size, const T* list,
std::size_t count)
{
for (std::size_t i = 0; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T(list[i % count]);
}
}
#endif
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
#if !defined(BOOST_NO_EXCEPTIONS)
template<class A, class T>
inline void
sp_array_construct(A& allocator, T* storage, std::size_t size)
{
std::size_t i = 0;
try {
for (i = 0; i < size; ++i) {
std::allocator_traits<A>::construct(allocator, storage + i);
}
} catch (...) {
sp_array_destroy(allocator, storage, i);
throw;
}
}
template<class A, class T>
inline void
sp_array_construct(A& allocator, T* storage, std::size_t size,
const T* list, std::size_t count)
{
std::size_t i = 0;
try {
for (i = 0; i < size; ++i) {
std::allocator_traits<A>::construct(allocator, storage + i,
list[i % count]);
}
} catch (...) {
sp_array_destroy(allocator, storage, i);
throw;
}
}
#else
template<class A, class T>
inline void
sp_array_construct(A& allocator, T* storage, std::size_t size)
{
for (std::size_t i = 0; i < size; ++i) {
std::allocator_traits<A>::construct(allocator, storage + i);
}
}
template<class A, class T>
inline void
sp_array_construct(A& allocator, T* storage, std::size_t size,
const T* list, std::size_t count)
{
for (std::size_t i = 0; i < size; ++i) {
std::allocator_traits<A>::construct(allocator, storage + i,
list[i % count]);
}
}
#endif
#endif
template<class T>
inline
typename sp_enable<boost::has_trivial_constructor<T>::value>::type
sp_array_default(T*, std::size_t) BOOST_NOEXCEPT { }
#if !defined(BOOST_NO_EXCEPTIONS)
template<class T>
inline
typename sp_enable<!boost::has_trivial_constructor<T>::value &&
boost::has_trivial_destructor<T>::value>::type
sp_array_default(T* storage, std::size_t size)
{
for (std::size_t i = 0; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T;
}
}
template<class T>
inline
typename sp_enable<!boost::has_trivial_constructor<T>::value &&
!boost::has_trivial_destructor<T>::value>::type
sp_array_default(T* storage, std::size_t size)
{
std::size_t i = 0;
try {
for (; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T;
}
} catch (...) {
while (i > 0) {
storage[--i].~T();
}
throw;
}
}
#else
template<class T>
inline
typename sp_enable<!boost::has_trivial_constructor<T>::value>::type
sp_array_default(T* storage, std::size_t size)
{
for (std::size_t i = 0; i < size; ++i) {
::new(static_cast<void*>(storage + i)) T;
}
}
#endif
template<class T, std::size_t N>
struct sp_less_align {
enum {
value = (boost::alignment_of<T>::value) < N
};
};
template<class T, std::size_t N>
BOOST_CONSTEXPR inline
typename sp_enable<sp_less_align<T, N>::value, std::size_t>::type
sp_align(std::size_t size) BOOST_NOEXCEPT
{
return (sizeof(T) * size + N - 1) & ~(N - 1);
}
template<class T, std::size_t N>
BOOST_CONSTEXPR inline
typename sp_enable<!sp_less_align<T, N>::value, std::size_t>::type
sp_align(std::size_t size) BOOST_NOEXCEPT
{
return sizeof(T) * size;
}
template<class T>
BOOST_CONSTEXPR inline std::size_t
sp_types(std::size_t size) BOOST_NOEXCEPT
{
return (size + sizeof(T) - 1) / sizeof(T);
}
template<class T, std::size_t N>
class sp_size_array_deleter {
public:
template<class U>
static void operator_fn(U) BOOST_NOEXCEPT { }
sp_size_array_deleter() BOOST_NOEXCEPT
: enabled_(false) { }
template<class A>
sp_size_array_deleter(const A&) BOOST_NOEXCEPT
: enabled_(false) { }
sp_size_array_deleter(const sp_size_array_deleter&) BOOST_NOEXCEPT
: enabled_(false) { }
~sp_size_array_deleter() {
if (enabled_) {
sp_array_destroy(reinterpret_cast<T*>(&storage_), N);
}
}
template<class U>
void operator()(U) {
if (enabled_) {
sp_array_destroy(reinterpret_cast<T*>(&storage_), N);
enabled_ = false;
}
}
void* construct() {
sp_array_construct(reinterpret_cast<T*>(&storage_), N);
enabled_ = true;
return &storage_;
}
void* construct(const T* list, std::size_t count) {
sp_array_construct(reinterpret_cast<T*>(&storage_), N,
list, count);
enabled_ = true;
return &storage_;
}
void* construct_default() {
sp_array_default(reinterpret_cast<T*>(&storage_), N);
enabled_ = true;
return &storage_;
}
private:
bool enabled_;
typename sp_array_storage<sizeof(T) * N,
boost::alignment_of<T>::value>::type storage_;
};
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
template<class T, std::size_t N, class A>
class sp_size_array_destroyer {
public:
template<class U>
static void operator_fn(U) BOOST_NOEXCEPT { }
template<class U>
sp_size_array_destroyer(const U& allocator) BOOST_NOEXCEPT
: allocator_(allocator),
enabled_(false) { }
sp_size_array_destroyer(const sp_size_array_destroyer& other)
BOOST_NOEXCEPT
: allocator_(other.allocator_),
enabled_(false) { }
~sp_size_array_destroyer() {
if (enabled_) {
sp_array_destroy(allocator_,
reinterpret_cast<T*>(&storage_), N);
}
}
template<class U>
void operator()(U) {
if (enabled_) {
sp_array_destroy(allocator_,
reinterpret_cast<T*>(&storage_), N);
enabled_ = false;
}
}
void* construct() {
sp_array_construct(allocator_,
reinterpret_cast<T*>(&storage_), N);
enabled_ = true;
return &storage_;
}
void* construct(const T* list, std::size_t count) {
sp_array_construct(allocator_,
reinterpret_cast<T*>(&storage_), N, list, count);
enabled_ = true;
return &storage_;
}
const A& allocator() const BOOST_NOEXCEPT {
return allocator_;
}
private:
typename sp_array_storage<sizeof(T) * N,
boost::alignment_of<T>::value>::type storage_;
A allocator_;
bool enabled_;
};
#endif
template<class T>
class sp_array_deleter {
public:
template<class U>
static void operator_fn(U) BOOST_NOEXCEPT { }
sp_array_deleter(std::size_t size) BOOST_NOEXCEPT
: address_(0),
size_(size) { }
template<class A>
sp_array_deleter(const A& allocator) BOOST_NOEXCEPT
: address_(0),
size_(allocator.size()) { }
template<class A>
sp_array_deleter(const A&, std::size_t size) BOOST_NOEXCEPT
: address_(0),
size_(size) { }
sp_array_deleter(const sp_array_deleter& other) BOOST_NOEXCEPT
: address_(0),
size_(other.size_) { }
~sp_array_deleter() {
if (address_) {
sp_array_destroy(static_cast<T*>(address_), size_);
}
}
template<class U>
void operator()(U) {
if (address_) {
sp_array_destroy(static_cast<T*>(address_), size_);
address_ = 0;
}
}
void construct(T* address) {
sp_array_construct(address, size_);
address_ = address;
}
void construct(T* address, const T* list, std::size_t count) {
sp_array_construct(address, size_, list, count);
address_ = address;
}
void construct_default(T* address) {
sp_array_default(address, size_);
address_ = address;
}
std::size_t size() const BOOST_NOEXCEPT {
return size_;
}
private:
void* address_;
std::size_t size_;
};
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
template<class T, class A>
class sp_array_destroyer {
public:
template<class U>
static void operator_fn(U) BOOST_NOEXCEPT { }
template<class U>
sp_array_destroyer(const U& allocator, std::size_t size)
BOOST_NOEXCEPT
: allocator_(allocator),
size_(size),
address_(0) { }
template<class U>
sp_array_destroyer(const U& allocator) BOOST_NOEXCEPT
: allocator_(allocator.allocator()),
size_(allocator.size()),
address_(0) { }
sp_array_destroyer(const sp_array_destroyer& other) BOOST_NOEXCEPT
: allocator_(other.allocator_),
size_(other.size_),
address_(0) { }
~sp_array_destroyer() {
if (address_) {
sp_array_destroy(allocator_, static_cast<T*>(address_),
size_);
}
}
template<class U>
void operator()(U) {
if (address_) {
sp_array_destroy(allocator_, static_cast<T*>(address_),
size_);
address_ = 0;
}
}
void construct(T* address) {
sp_array_construct(allocator_, address, size_);
address_ = address;
}
void construct(T* address, const T* list, std::size_t count) {
sp_array_construct(allocator_, address, size_, list, count);
address_ = address;
}
const A& allocator() const BOOST_NOEXCEPT {
return allocator_;
}
std::size_t size() const BOOST_NOEXCEPT {
return size_;
}
private:
A allocator_;
std::size_t size_;
void* address_;
};
#endif
template<class T, class A>
class sp_array_allocator {
template<class U, class V>
friend class sp_array_allocator;
public:
typedef typename A::value_type value_type;
private:
enum {
alignment = sp_max_size<boost::alignment_of<T>::value,
boost::alignment_of<value_type>::value>::value
};
typedef typename boost::type_with_alignment<alignment>::type type;
typedef typename sp_bind_allocator<A, type>::type type_allocator;
public:
template<class U>
struct rebind {
typedef sp_array_allocator<T,
typename sp_bind_allocator<A, U>::type> other;
};
sp_array_allocator(const A& allocator, std::size_t size,
void** result) BOOST_NOEXCEPT
: allocator_(allocator),
size_(size),
result_(result) { }
sp_array_allocator(const A& allocator, std::size_t size)
BOOST_NOEXCEPT
: allocator_(allocator),
size_(size) { }
template<class U>
sp_array_allocator(const sp_array_allocator<T, U>& other)
BOOST_NOEXCEPT
: allocator_(other.allocator_),
size_(other.size_),
result_(other.result_) { }
value_type* allocate(std::size_t count) {
type_allocator allocator(allocator_);
std::size_t node = sp_align<value_type, alignment>(count);
std::size_t size = sp_types<type>(node + sizeof(T) * size_);
type* address = allocator.allocate(size);
*result_ = reinterpret_cast<char*>(address) + node;
return reinterpret_cast<value_type*>(address);
}
void deallocate(value_type* value, std::size_t count) {
type_allocator allocator(allocator_);
std::size_t node = sp_align<value_type, alignment>(count);
std::size_t size = sp_types<type>(node + sizeof(T) * size_);
allocator.deallocate(reinterpret_cast<type*>(value), size);
}
const A& allocator() const BOOST_NOEXCEPT {
return allocator_;
}
std::size_t size() const BOOST_NOEXCEPT {
return size_;
}
private:
A allocator_;
std::size_t size_;
void** result_;
};
template<class T, class U, class V>
inline bool
operator==(const sp_array_allocator<T, U>& first,
const sp_array_allocator<T, V>& second) BOOST_NOEXCEPT
{
return first.allocator() == second.allocator() &&
first.size() == second.size();
}
template<class T, class U, class V>
inline bool
operator!=(const sp_array_allocator<T, U>& first,
const sp_array_allocator<T, V>& second) BOOST_NOEXCEPT
{
return !(first == second);
}
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
template<class A, class T, std::size_t N>
struct sp_select_size_deleter {
typedef sp_size_array_destroyer<T, N,
typename sp_bind_allocator<A, T>::type> type;
};
template<class U, class T, std::size_t N>
struct sp_select_size_deleter<std::allocator<U>, T, N> {
typedef sp_size_array_deleter<T, N> type;
};
template<class A, class T>
struct sp_select_deleter {
typedef sp_array_destroyer<T,
typename sp_bind_allocator<A, T>::type> type;
};
template<class U, class T>
struct sp_select_deleter<std::allocator<U>, T> {
typedef sp_array_deleter<T> type;
};
#else
template<class, class T, std::size_t N>
struct sp_select_size_deleter {
typedef sp_size_array_deleter<T, N> type;
};
template<class, class T>
struct sp_select_deleter {
typedef sp_array_deleter<T> type;
};
#endif
template<class P, class T, std::size_t N, class A>
class sp_counted_impl_pda<P, sp_size_array_deleter<T, N>, A>
: public sp_counted_base {
public:
typedef sp_size_array_deleter<T, N> deleter_type;
private:
typedef sp_counted_impl_pda<P, deleter_type, A> type;
typedef typename sp_bind_allocator<A, type>::type deallocator;
public:
sp_counted_impl_pda(P, const deleter_type&, const A& allocator)
: deleter_(allocator),
allocator_(allocator) { }
sp_counted_impl_pda(P, const A& allocator)
: deleter_(allocator) { }
void dispose() {
deleter_(0);
}
void destroy() {
deallocator allocator(allocator_);
this->~type();
allocator.deallocate(this, 1);
}
void* get_deleter(const sp_typeinfo&) {
return &reinterpret_cast<char&>(deleter_);
}
void* get_untyped_deleter() {
return &reinterpret_cast<char&>(deleter_);
}
private:
deleter_type deleter_;
A allocator_;
};
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
template<class P, class T, std::size_t N, class U, class A>
class sp_counted_impl_pda<P, sp_size_array_destroyer<T, N, U>, A>
: public sp_counted_base {
public:
typedef sp_size_array_destroyer<T, N, U> deleter_type;
private:
typedef sp_counted_impl_pda<P, deleter_type, A> type;
typedef typename sp_bind_allocator<A, type>::type deallocator;
public:
sp_counted_impl_pda(P, const deleter_type&, const A& allocator)
: deleter_(allocator) { }
sp_counted_impl_pda(P, const A& allocator)
: deleter_(allocator) { }
void dispose() {
deleter_(0);
}
void destroy() {
deallocator allocator(deleter_.allocator());
this->~type();
allocator.deallocate(this, 1);
}
void* get_deleter(const sp_typeinfo&) {
return &reinterpret_cast<char&>(deleter_);
}
void* get_untyped_deleter() {
return &reinterpret_cast<char&>(deleter_);
}
private:
deleter_type deleter_;
};
#endif
template<class P, class T, class A>
class sp_counted_impl_pda<P, sp_array_deleter<T>,
sp_array_allocator<T, A> >
: public sp_counted_base {
public:
typedef sp_array_deleter<T> deleter_type;
typedef sp_array_allocator<T, A> allocator_type;
private:
typedef sp_counted_impl_pda<P, deleter_type, allocator_type> type;
typedef sp_array_allocator<T,
typename sp_bind_allocator<A, type>::type> deallocator;
public:
sp_counted_impl_pda(P, const deleter_type&,
const allocator_type& allocator)
: deleter_(allocator),
allocator_(allocator.allocator()) { }
sp_counted_impl_pda(P, const allocator_type& allocator)
: deleter_(allocator),
allocator_(allocator.allocator()) { }
void dispose() {
deleter_(0);
}
void destroy() {
deallocator allocator(allocator_, deleter_.size());
this->~type();
allocator.deallocate(this, 1);
}
void* get_deleter(const sp_typeinfo&) {
return &reinterpret_cast<char&>(deleter_);
}
void* get_untyped_deleter() {
return &reinterpret_cast<char&>(deleter_);
}
private:
deleter_type deleter_;
A allocator_;
};
#if !defined(BOOST_NO_CXX11_ALLOCATOR)
template<class P, class T, class U, class A>
class sp_counted_impl_pda<P, sp_array_destroyer<T, U>,
sp_array_allocator<T, A> >
: public sp_counted_base {
public:
typedef sp_array_destroyer<T, U> deleter_type;
typedef sp_array_allocator<T, A> allocator_type;
private:
typedef sp_counted_impl_pda<P, deleter_type, allocator_type> type;
typedef sp_array_allocator<T,
typename sp_bind_allocator<A, type>::type> deallocator;
public:
sp_counted_impl_pda(P, const deleter_type&,
const allocator_type& allocator)
: deleter_(allocator) { }
sp_counted_impl_pda(P, const allocator_type& allocator)
: deleter_(allocator) { }
void dispose() {
deleter_(0);
}
void destroy() {
deallocator allocator(deleter_.allocator(), deleter_.size());
this->~type();
allocator.deallocate(this, 1);
}
void* get_deleter(const sp_typeinfo&) {
return &reinterpret_cast<char&>(deleter_);
}
void* get_untyped_deleter() {
return &reinterpret_cast<char&>(deleter_);
}
private:
deleter_type deleter_;
};
#endif
} /* detail */
template<class T, class A>
inline typename detail::sp_if_size_array<T>::type
allocate_shared(const A& allocator)
{
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef typename detail::sp_select_size_deleter<A, scalar,
detail::sp_array_count<T>::value>::type deleter;
shared_ptr<T> result(static_cast<type*>(0),
detail::sp_inplace_tag<deleter>(), allocator);
deleter* state = detail::sp_get_deleter<deleter>(result);
void* start = state->construct();
return shared_ptr<T>(result, static_cast<type*>(start));
}
template<class T, class A>
inline typename detail::sp_if_size_array<T>::type
allocate_shared(const A& allocator,
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_select_size_deleter<A, scalar,
detail::sp_array_count<T>::value>::type deleter;
shared_ptr<T> result(static_cast<type*>(0),
detail::sp_inplace_tag<deleter>(), allocator);
deleter* state = detail::sp_get_deleter<deleter>(result);
void* start = state->construct(reinterpret_cast<const
scalar*>(&value), detail::sp_array_count<type>::value);
return shared_ptr<T>(result, static_cast<type*>(start));
}
template<class T, class A>
inline typename detail::sp_if_size_array<T>::type
allocate_shared_noinit(const A& allocator)
{
typedef typename detail::sp_array_element<T>::type type;
typedef typename detail::sp_array_scalar<T>::type scalar;
typedef detail::sp_size_array_deleter<scalar,
detail::sp_array_count<T>::value> deleter;
shared_ptr<T> result(static_cast<type*>(0),
detail::sp_inplace_tag<deleter>(), allocator);
deleter* state = detail::sp_get_deleter<deleter>(result);
void* start = state->construct_default();
return shared_ptr<T>(result, static_cast<type*>(start));
}
template<class T, class A>
inline typename detail::sp_if_array<T>::type
allocate_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_select_deleter<A, scalar>::type deleter;
std::size_t size = count * detail::sp_array_count<type>::value;
void* start;
shared_ptr<T> result(static_cast<type*>(0),
detail::sp_inplace_tag<deleter>(),
detail::sp_array_allocator<scalar, A>(allocator, size, &start));
deleter* state = detail::sp_get_deleter<deleter>(result);
state->construct(static_cast<scalar*>(start));
return shared_ptr<T>(result, static_cast<type*>(start));
}
template<class T, class A>
inline typename detail::sp_if_array<T>::type
allocate_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_select_deleter<A, scalar>::type deleter;
std::size_t size = count * detail::sp_array_count<type>::value;
void* start;
shared_ptr<T> result(static_cast<type*>(0),
detail::sp_inplace_tag<deleter>(),
detail::sp_array_allocator<scalar, A>(allocator, size, &start));
deleter* state = detail::sp_get_deleter<deleter>(result);
state->construct(static_cast<scalar*>(start),
reinterpret_cast<const scalar*>(&value),
detail::sp_array_count<type>::value);
return shared_ptr<T>(result, static_cast<type*>(start));
}
template<class T, class A>
inline typename detail::sp_if_array<T>::type
allocate_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 detail::sp_array_deleter<scalar> deleter;
std::size_t size = count * detail::sp_array_count<type>::value;
void* start;
shared_ptr<T> result(static_cast<type*>(0),
detail::sp_inplace_tag<deleter>(),
detail::sp_array_allocator<scalar, A>(allocator, size, &start));
deleter* state = detail::sp_get_deleter<deleter>(result);
state->construct_default(static_cast<scalar*>(start));
return shared_ptr<T>(result, static_cast<type*>(start));
}
} /* boost */
#endif