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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/type_traits.h>
#include <thrust/detail/allocator/allocator_traits.h>
#include <thrust/detail/type_traits/pointer_traits.h>
#include <thrust/for_each.h>
#include <thrust/uninitialized_fill.h>
#include <thrust/detail/memory_wrapper.h>
THRUST_NAMESPACE_BEGIN
namespace detail
{
namespace allocator_traits_detail
{
// fill_construct_range has 2 cases:
// if Allocator has an effectful member function construct:
// 1. construct via the allocator
// else
// 2. construct via uninitialized_fill
template<typename Allocator, typename T, typename Arg1>
struct has_effectful_member_construct2
: has_member_construct2<Allocator,T,Arg1>
{};
// std::allocator::construct's only effect is to invoke placement new
template<typename U, typename T, typename Arg1>
struct has_effectful_member_construct2<std::allocator<U>,T,Arg1>
: thrust::detail::false_type
{};
template<typename Allocator, typename Arg1>
struct construct2_via_allocator
{
Allocator &a;
Arg1 arg;
__host__ __device__
construct2_via_allocator(Allocator &a, const Arg1 &arg)
: a(a), arg(arg)
{}
template<typename T>
inline __host__ __device__
void operator()(T &x)
{
allocator_traits<Allocator>::construct(a, &x, arg);
}
};
template<typename Allocator, typename Pointer, typename Size, typename T>
__host__ __device__
typename enable_if<
has_effectful_member_construct2<
Allocator,
typename pointer_element<Pointer>::type,
T
>::value
>::type
fill_construct_range(Allocator &a, Pointer p, Size n, const T &value)
{
thrust::for_each_n(allocator_system<Allocator>::get(a), p, n, construct2_via_allocator<Allocator,T>(a, value));
}
template<typename Allocator, typename Pointer, typename Size, typename T>
__host__ __device__
typename disable_if<
has_effectful_member_construct2<
Allocator,
typename pointer_element<Pointer>::type,
T
>::value
>::type
fill_construct_range(Allocator &a, Pointer p, Size n, const T &value)
{
thrust::uninitialized_fill_n(allocator_system<Allocator>::get(a), p, n, value);
}
} // end allocator_traits_detail
template<typename Alloc, typename Pointer, typename Size, typename T>
__host__ __device__
void fill_construct_range(Alloc &a, Pointer p, Size n, const T &value)
{
return allocator_traits_detail::fill_construct_range(a,p,n,value);
}
} // end detail
THRUST_NAMESPACE_END
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