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