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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.
*/
/*! \file distance.h
* \brief Computes the size of a range
*/
#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/iterator/iterator_traits.h>
THRUST_NAMESPACE_BEGIN
/*! \addtogroup iterators
* \{
*/
/*! \p distance finds the distance between \p first and \p last, i.e. the
* number of times that \p first must be incremented until it is equal to
* \p last.
*
* \param first The beginning of an input range of interest.
* \param last The end of an input range of interest.
* \return The distance between the beginning and end of the input range.
*
* \tparam InputIterator is a model of <a href="https://en.cppreference.com/w/cpp/iterator/input_iterator">Input Iterator</a>.
*
* \pre If \c InputIterator meets the requirements of random access iterator, \p last shall be reachable from \p first or
* \p first shall be reachable from \p last; otherwise, \p last shall be reachable from \p first.
*
* The following code snippet demonstrates how to use \p distance to compute
* the distance to one iterator from another.
*
* \code
* #include <thrust/distance.h>
* #include <thrust/device_vector.h>
* ...
* thrust::device_vector<int> vec(13);
* thrust::device_vector<int>::iterator iter1 = vec.begin();
* thrust::device_vector<int>::iterator iter2 = iter1 + 7;
*
* int d = thrust::distance(iter1, iter2);
*
* // d is 7
* \endcode
*
* \see https://en.cppreference.com/w/cpp/iterator/distance
*/
template<typename InputIterator>
inline __host__ __device__
typename thrust::iterator_traits<InputIterator>::difference_type
distance(InputIterator first, InputIterator last);
/*! \} // end iterators
*/
THRUST_NAMESPACE_END
#include <thrust/detail/distance.inl>
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