mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-30 20:40:28 -04:00
119 lines
3.6 KiB
C++
119 lines
3.6 KiB
C++
//---------------------------------------------------------------------------//
|
|
// 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_DETAIL_IS_CONTIGUOUS_ITERATOR_HPP
|
|
#define BOOST_COMPUTE_DETAIL_IS_CONTIGUOUS_ITERATOR_HPP
|
|
|
|
#include <vector>
|
|
#include <valarray>
|
|
|
|
#include <boost/config.hpp>
|
|
#include <boost/type_traits.hpp>
|
|
#include <boost/utility/enable_if.hpp>
|
|
|
|
namespace boost {
|
|
namespace compute {
|
|
namespace detail {
|
|
|
|
// default = false
|
|
template<class Iterator, class Enable = void>
|
|
struct _is_contiguous_iterator : public boost::false_type {};
|
|
|
|
// std::vector<T>::iterator = true
|
|
template<class Iterator>
|
|
struct _is_contiguous_iterator<
|
|
Iterator,
|
|
typename boost::enable_if<
|
|
typename boost::is_same<
|
|
Iterator,
|
|
typename std::vector<typename Iterator::value_type>::iterator
|
|
>::type
|
|
>::type
|
|
> : public boost::true_type {};
|
|
|
|
// std::vector<T>::const_iterator = true
|
|
template<class Iterator>
|
|
struct _is_contiguous_iterator<
|
|
Iterator,
|
|
typename boost::enable_if<
|
|
typename boost::is_same<
|
|
Iterator,
|
|
typename std::vector<typename Iterator::value_type>::const_iterator
|
|
>::type
|
|
>::type
|
|
> : public boost::true_type {};
|
|
|
|
// std::valarray<T>::iterator = true
|
|
template<class Iterator>
|
|
struct _is_contiguous_iterator<
|
|
Iterator,
|
|
typename boost::enable_if<
|
|
typename boost::is_same<
|
|
Iterator,
|
|
typename std::valarray<typename Iterator::value_type>::iterator
|
|
>::type
|
|
>::type
|
|
> : public boost::true_type {};
|
|
|
|
// std::valarray<T>::const_iterator = true
|
|
template<class Iterator>
|
|
struct _is_contiguous_iterator<
|
|
Iterator,
|
|
typename boost::enable_if<
|
|
typename boost::is_same<
|
|
Iterator,
|
|
typename std::valarray<typename Iterator::value_type>::const_iterator
|
|
>::type
|
|
>::type
|
|
> : public boost::true_type {};
|
|
|
|
// T* = true
|
|
template<class Iterator>
|
|
struct _is_contiguous_iterator<
|
|
Iterator,
|
|
typename boost::enable_if<
|
|
boost::is_pointer<Iterator>
|
|
>::type
|
|
> : public boost::true_type {};
|
|
|
|
// the is_contiguous_iterator meta-function returns true if Iterator points
|
|
// to a range of contiguous values. examples of contiguous iterators are
|
|
// std::vector<>::iterator and float*. examples of non-contiguous iterators
|
|
// are std::set<>::iterator and std::insert_iterator<>.
|
|
//
|
|
// the implementation consists of two phases. the first checks that value_type
|
|
// for the iterator is not void. this must be done as for many containers void
|
|
// is not a valid value_type (ex. std::vector<void>::iterator is not valid).
|
|
// after ensuring a non-void value_type, the _is_contiguous_iterator function
|
|
// is invoked. it has specializations retuning true for all (known) contiguous
|
|
// iterators types and a default value of false.
|
|
template<class Iterator, class Enable = void>
|
|
struct is_contiguous_iterator :
|
|
public _is_contiguous_iterator<
|
|
typename boost::remove_cv<Iterator>::type
|
|
> {};
|
|
|
|
// value_type of void = false
|
|
template<class Iterator>
|
|
struct is_contiguous_iterator<
|
|
Iterator,
|
|
typename boost::enable_if<
|
|
typename boost::is_void<
|
|
typename Iterator::value_type
|
|
>::type
|
|
>::type
|
|
> : public boost::false_type {};
|
|
|
|
} // end detail namespace
|
|
} // end compute namespace
|
|
} // end boost namespace
|
|
|
|
#endif // BOOST_COMPUTE_DETAIL_IS_CONTIGUOUS_ITERATOR_HPP
|