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//---------------------------------------------------------------------------//
// Copyright (c) 2013 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_ITERATOR_FUNCTION_INPUT_ITERATOR_HPP
#define BOOST_COMPUTE_ITERATOR_FUNCTION_INPUT_ITERATOR_HPP
#include <cstddef>
#include <iterator>
#include <boost/config.hpp>
#include <boost/iterator/iterator_facade.hpp>
#include <boost/compute/detail/meta_kernel.hpp>
#include <boost/compute/type_traits/is_device_iterator.hpp>
#include <boost/compute/type_traits/result_of.hpp>
namespace boost {
namespace compute {
// forward declaration for function_input_iterator<Function>
template<class Function> class function_input_iterator;
namespace detail {
// helper class which defines the iterator_facade super-class
// type for function_input_iterator<Function>
template<class Function>
class function_input_iterator_base
{
public:
typedef ::boost::iterator_facade<
::boost::compute::function_input_iterator<Function>,
typename ::boost::compute::result_of<Function()>::type,
::std::random_access_iterator_tag,
typename ::boost::compute::result_of<Function()>::type
> type;
};
template<class Function>
struct function_input_iterator_expr
{
typedef typename ::boost::compute::result_of<Function()>::type result_type;
function_input_iterator_expr(const Function &function)
: m_function(function)
{
}
const Function m_function;
};
template<class Function>
inline meta_kernel& operator<<(meta_kernel &kernel,
const function_input_iterator_expr<Function> &expr)
{
return kernel << expr.m_function();
}
} // end detail namespace
/// \class function_input_iterator
/// \brief Iterator which returns the result of a function when dereferenced
///
/// For example:
///
/// \snippet test/test_function_input_iterator.cpp generate_42
///
/// \see make_function_input_iterator()
template<class Function>
class function_input_iterator :
public detail::function_input_iterator_base<Function>::type
{
public:
typedef typename detail::function_input_iterator_base<Function>::type super_type;
typedef typename super_type::reference reference;
typedef typename super_type::difference_type difference_type;
typedef Function function;
function_input_iterator(const Function &function, size_t index = 0)
: m_function(function),
m_index(index)
{
}
function_input_iterator(const function_input_iterator<Function> &other)
: m_function(other.m_function),
m_index(other.m_index)
{
}
function_input_iterator<Function>&
operator=(const function_input_iterator<Function> &other)
{
if(this != &other){
m_function = other.m_function;
m_index = other.m_index;
}
return *this;
}
~function_input_iterator()
{
}
size_t get_index() const
{
return m_index;
}
template<class Expr>
detail::function_input_iterator_expr<Function>
operator[](const Expr &expr) const
{
(void) expr;
return detail::function_input_iterator_expr<Function>(m_function);
}
private:
friend class ::boost::iterator_core_access;
reference dereference() const
{
return reference();
}
bool equal(const function_input_iterator<Function> &other) const
{
return m_function == other.m_function && m_index == other.m_index;
}
void increment()
{
m_index++;
}
void decrement()
{
m_index--;
}
void advance(difference_type n)
{
m_index = static_cast<size_t>(static_cast<difference_type>(m_index) + n);
}
difference_type
distance_to(const function_input_iterator<Function> &other) const
{
return static_cast<difference_type>(other.m_index - m_index);
}
private:
Function m_function;
size_t m_index;
};
/// Returns a function_input_iterator with \p function.
///
/// \param function function to execute when dereferenced
/// \param index index of the iterator
///
/// \return a \c function_input_iterator with \p function
template<class Function>
inline function_input_iterator<Function>
make_function_input_iterator(const Function &function, size_t index = 0)
{
return function_input_iterator<Function>(function, index);
}
/// \internal_ (is_device_iterator specialization for function_input_iterator)
template<class Function>
struct is_device_iterator<function_input_iterator<Function> > : boost::true_type {};
} // end compute namespace
} // end boost namespace
#endif // BOOST_COMPUTE_ITERATOR_FUNCTION_INPUT_ITERATOR_HPP
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