forked from boostorg/iterator
61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
// interator.hpp workarounds for non-conforming standard libraries ---------//
|
|
|
|
// (C) Copyright Boost.org 2000. Permission to copy, use, modify, sell and
|
|
// distribute this software is granted provided this copyright notice appears
|
|
// in all copies. This software is provided "as is" without express or implied
|
|
// warranty, and with no claim as to its suitability for any purpose.
|
|
|
|
// See http://www.boost.org/libs/utility for documentation.
|
|
|
|
// Revision History
|
|
// 12 Jan 01 added <cstddef> for std::ptrdiff_t (Jens Maurer)
|
|
// 28 Jun 00 Workarounds to deal with known MSVC bugs (David Abrahams)
|
|
// 26 Jun 00 Initial version (Jeremy Siek)
|
|
|
|
#ifndef BOOST_ITERATOR_HPP
|
|
#define BOOST_ITERATOR_HPP
|
|
|
|
#include <iterator>
|
|
#include <cstddef> // std::ptrdiff_t
|
|
#include <boost/config.hpp>
|
|
|
|
namespace boost
|
|
{
|
|
# if defined(BOOST_NO_STD_ITERATOR) && !defined(BOOST_MSVC_STD_ITERATOR)
|
|
template <class Category, class T,
|
|
class Distance = std::ptrdiff_t,
|
|
class Pointer = T*, class Reference = T&>
|
|
struct iterator
|
|
{
|
|
typedef T value_type;
|
|
typedef Distance difference_type;
|
|
typedef Pointer pointer;
|
|
typedef Reference reference;
|
|
typedef Category iterator_category;
|
|
};
|
|
# else
|
|
|
|
// declare iterator_base in namespace detail to work around MSVC bugs which
|
|
// prevent derivation from an identically-named class in a different namespace.
|
|
namespace detail {
|
|
template <class Category, class T, class Distance, class Pointer, class Reference>
|
|
# if !defined(BOOST_MSVC_STD_ITERATOR)
|
|
struct iterator_base : std::iterator<Category, T, Distance, Pointer, Reference> {};
|
|
# else
|
|
struct iterator_base : std::iterator<Category, T, Distance>
|
|
{
|
|
typedef Reference reference;
|
|
typedef Pointer pointer;
|
|
typedef Distance difference_type;
|
|
};
|
|
# endif
|
|
}
|
|
|
|
template <class Category, class T, class Distance = std::ptrdiff_t,
|
|
class Pointer = T*, class Reference = T&>
|
|
struct iterator : detail::iterator_base<Category, T, Distance, Pointer, Reference> {};
|
|
# endif
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_ITERATOR_HPP
|