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/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/allocator/allocator_traits.h>
#include <thrust/detail/type_traits.h>
#include <thrust/detail/type_traits/pointer_traits.h>
#include <thrust/for_each.h>
#include <thrust/uninitialized_fill.h>
THRUST_NAMESPACE_BEGIN
namespace detail
{
namespace allocator_traits_detail
{
template<typename Allocator>
struct construct1_via_allocator
{
Allocator &a;
__host__ __device__
construct1_via_allocator(Allocator &a)
: a(a)
{}
template<typename T>
inline __host__ __device__
void operator()(T &x)
{
allocator_traits<Allocator>::construct(a, &x);
}
};
// we need to construct T via the allocator if...
template<typename Allocator, typename T>
struct needs_default_construct_via_allocator
: thrust::detail::or_<
has_member_construct1<Allocator,T>, // if the Allocator does something interesting
thrust::detail::not_<has_trivial_constructor<T> > // or if T's default constructor does something interesting
>
{};
// we know that std::allocator::construct's only effect is to call T's
// default constructor, so we needn't use it for default construction
// unless T's constructor does something interesting
template<typename U, typename T>
struct needs_default_construct_via_allocator<std::allocator<U>, T>
: thrust::detail::not_<has_trivial_constructor<T> >
{};
template<typename Allocator, typename Pointer, typename Size>
__host__ __device__
typename enable_if<
needs_default_construct_via_allocator<
Allocator,
typename pointer_element<Pointer>::type
>::value
>::type
default_construct_range(Allocator &a, Pointer p, Size n)
{
thrust::for_each_n(allocator_system<Allocator>::get(a), p, n, construct1_via_allocator<Allocator>(a));
}
template<typename Allocator, typename Pointer, typename Size>
__host__ __device__
typename disable_if<
needs_default_construct_via_allocator<
Allocator,
typename pointer_element<Pointer>::type
>::value
>::type
default_construct_range(Allocator &a, Pointer p, Size n)
{
thrust::uninitialized_fill_n(allocator_system<Allocator>::get(a), p, n, typename pointer_element<Pointer>::type());
}
} // end allocator_traits_detail
template<typename Allocator, typename Pointer, typename Size>
__host__ __device__
void default_construct_range(Allocator &a, Pointer p, Size n)
{
return allocator_traits_detail::default_construct_range(a,p,n);
}
} // end detail
THRUST_NAMESPACE_END
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