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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>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <thrust/functional.h>
#include <thrust/system/detail/generic/replace.h>
#include <thrust/transform.h>
#include <thrust/replace.h>
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace detail
{
namespace generic
{
namespace detail
{
// this functor receives x, and returns a new_value if predicate(x) is true; otherwise,
// it returns x
template<typename Predicate, typename NewType, typename OutputType>
struct new_value_if
{
__host__ __device__
new_value_if(Predicate p, NewType nv):pred(p),new_value(nv){}
template<typename InputType>
__host__ __device__
OutputType operator()(const InputType &x) const
{
return pred(x) ? new_value : x;
} // end operator()()
// this version of operator()() works like the previous but
// feeds its second argument to pred
template<typename InputType, typename PredicateArgumentType>
__host__ __device__
OutputType operator()(const InputType &x, const PredicateArgumentType &y)
{
return pred(y) ? new_value : x;
} // end operator()()
Predicate pred;
NewType new_value;
}; // end new_value_if
// this unary functor ignores its argument and returns a constant
template<typename T>
struct constant_unary
{
__host__ __device__
constant_unary(T _c):c(_c){}
template<typename U>
__host__ __device__
T operator()(U &)
{
return c;
} // end operator()()
T c;
}; // end constant_unary
} // end detail
template<typename DerivedPolicy, typename InputIterator, typename OutputIterator, typename Predicate, typename T>
__host__ __device__
OutputIterator replace_copy_if(thrust::execution_policy<DerivedPolicy> &exec,
InputIterator first,
InputIterator last,
OutputIterator result,
Predicate pred,
const T &new_value)
{
typedef typename thrust::iterator_traits<OutputIterator>::value_type OutputType;
detail::new_value_if<Predicate,T,OutputType> op(pred,new_value);
return thrust::transform(exec, first, last, result, op);
} // end replace_copy_if()
template<typename DerivedPolicy, typename InputIterator1, typename InputIterator2, typename OutputIterator, typename Predicate, typename T>
__host__ __device__
OutputIterator replace_copy_if(thrust::execution_policy<DerivedPolicy> &exec,
InputIterator1 first,
InputIterator1 last,
InputIterator2 stencil,
OutputIterator result,
Predicate pred,
const T &new_value)
{
typedef typename thrust::iterator_traits<OutputIterator>::value_type OutputType;
detail::new_value_if<Predicate,T,OutputType> op(pred,new_value);
return thrust::transform(exec, first, last, stencil, result, op);
} // end replace_copy_if()
template<typename DerivedPolicy, typename InputIterator, typename OutputIterator, typename T>
__host__ __device__
OutputIterator replace_copy(thrust::execution_policy<DerivedPolicy> &exec,
InputIterator first,
InputIterator last,
OutputIterator result,
const T &old_value,
const T &new_value)
{
using thrust::placeholders::_1;
return thrust::replace_copy_if(exec, first, last, result, _1 == old_value, new_value);
} // end replace_copy()
template<typename DerivedPolicy, typename ForwardIterator, typename Predicate, typename T>
__host__ __device__
void replace_if(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
Predicate pred,
const T &new_value)
{
detail::constant_unary<T> f(new_value);
thrust::transform_if(exec, first, last, first, first, f, pred);
} // end replace_if()
template<typename DerivedPolicy, typename ForwardIterator, typename InputIterator, typename Predicate, typename T>
__host__ __device__
void replace_if(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
InputIterator stencil,
Predicate pred,
const T &new_value)
{
detail::constant_unary<T> f(new_value);
thrust::transform_if(exec, first, last, stencil, first, f, pred);
} // end replace_if()
template<typename DerivedPolicy, typename ForwardIterator, typename T>
__host__ __device__
void replace(thrust::execution_policy<DerivedPolicy> &exec,
ForwardIterator first,
ForwardIterator last,
const T &old_value,
const T &new_value)
{
using thrust::placeholders::_1;
return thrust::replace_if(exec, first, last, _1 == old_value, new_value);
} // end replace()
} // end namespace generic
} // end namespace detail
} // end namespace system
THRUST_NAMESPACE_END
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