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//===-- Support/iterator - "Portable" wrapper around <iterator> -*- C++ -*-===//
//
// This file provides a wrapper around the mysterious <iterator> header file.
// In GCC 2.95.3, the file defines a bidirectional_iterator class (and other
// friends), instead of the standard iterator class. In GCC 3.1, the
// bidirectional_iterator class got moved out and the new, standards compliant,
// iterator<> class was added. Because there is nothing that we can do to get
// correct behavior on both compilers, we have this header with #ifdef's. Gross
// huh?
//
// By #includ'ing this file, you get the contents of <iterator> plus the
// following classes in the global namespace:
//
// 1. bidirectional_iterator
// 2. forward_iterator
//
//===----------------------------------------------------------------------===//
#ifndef SUPPORT_ITERATOR
#define SUPPORT_ITERATOR
#include "Config/config.h"
#include <iterator>
//////////////////////////////////////////////////////////////////////////////
// If the bidirectional iterator is not defined, attempt to define it using
// the C++ standard iterator.
//////////////////////////////////////////////////////////////////////////////
#ifndef HAVE_BI_ITERATOR
#ifdef HAVE_STD_ITERATOR
// Define stupid wrappers around std::iterator...
template<class Ty, class PtrDiffTy>
struct bidirectional_iterator
: public std::iterator<std::bidirectional_iterator_tag, Ty, PtrDiffTy> {
};
#else
#error "Need to have standard iterator to define bidirectional iterator!"
#endif
#else
// Just use bidirectional_iterator directly.
using std::bidirectional_iterator;
#endif
//////////////////////////////////////////////////////////////////////////////
// If the forward iterator is not defined, attempt to define it using the
// C++ standard iterator.
//////////////////////////////////////////////////////////////////////////////
#ifndef HAVE_FWD_ITERATOR
#ifdef HAVE_STD_ITERATOR
template<class Ty, class PtrDiffTy>
struct forward_iterator
: public std::iterator<std::forward_iterator_tag, Ty, PtrDiffTy> {
};
#else
#error "Need to have standard iterator to define forward iterator!"
#endif
#else
// Just use forward iterator directly.
using std::forward_iterator;
#endif
#endif
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