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//---------------------------------------------------------------------------//
// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//
#ifndef BOOST_COMPUTE_UTILITY_EXTENTS_HPP
#define BOOST_COMPUTE_UTILITY_EXTENTS_HPP
#include <functional>
#include <numeric>
#include <boost/compute/config.hpp>
#ifndef BOOST_COMPUTE_NO_HDR_INITIALIZER_LIST
#include <initializer_list>
#endif
#include <boost/array.hpp>
namespace boost {
namespace compute {
/// The extents class contains an array of n-dimensional extents.
///
/// \see dim()
template<size_t N>
class extents
{
public:
typedef size_t size_type;
static const size_type static_size = N;
typedef boost::array<size_t, N> array_type;
typedef typename array_type::iterator iterator;
typedef typename array_type::const_iterator const_iterator;
/// Creates an extents object with each component set to zero.
///
/// For example:
/// \code
/// extents<3> exts(); // (0, 0, 0)
/// \endcode
extents()
{
m_extents.fill(0);
}
/// Creates an extents object with each component set to \p value.
///
/// For example:
/// \code
/// extents<3> exts(1); // (1, 1, 1)
/// \endcode
explicit extents(size_t value)
{
m_extents.fill(value);
}
#ifndef BOOST_COMPUTE_NO_HDR_INITIALIZER_LIST
/// Creates an extents object with \p values.
extents(std::initializer_list<size_t> values)
{
BOOST_ASSERT(values.size() == N);
std::copy(values.begin(), values.end(), m_extents.begin());
}
#endif // BOOST_COMPUTE_NO_HDR_INITIALIZER_LIST
/// Returns the size (i.e. dimensionality) of the extents array.
size_type size() const
{
return N;
}
/// Returns the linear size of the extents. This is equivalent to the
/// product of each extent in each dimension.
size_type linear() const
{
return std::accumulate(
m_extents.begin(), m_extents.end(), 1, std::multiplies<size_type>()
);
}
/// Returns a pointer to the extents data array.
///
/// This is useful for passing the extents data to OpenCL APIs which
/// expect an array of \c size_t.
size_t* data()
{
return m_extents.data();
}
/// \overload
const size_t* data() const
{
return m_extents.data();
}
iterator begin()
{
return m_extents.begin();
}
const_iterator begin() const
{
return m_extents.begin();
}
const_iterator cbegin() const
{
return m_extents.cbegin();
}
iterator end()
{
return m_extents.end();
}
const_iterator end() const
{
return m_extents.end();
}
const_iterator cend() const
{
return m_extents.cend();
}
/// Returns a reference to the extent at \p index.
size_t& operator[](size_t index)
{
return m_extents[index];
}
/// \overload
const size_t& operator[](size_t index) const
{
return m_extents[index];
}
/// Returns \c true if the extents in \c *this are the same as \p other.
bool operator==(const extents &other) const
{
return m_extents == other.m_extents;
}
/// Returns \c true if the extents in \c *this are not the same as \p other.
bool operator!=(const extents &other) const
{
return m_extents != other.m_extents;
}
private:
array_type m_extents;
};
} // end compute namespace
} // end boost namespace
#endif // BOOST_COMPUTE_UTILITY_EXTENTS_HPP
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