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77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
//===-- llvm/ADT/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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// The #if directives' expressions are filled in by Autoconf.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_ITERATOR
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#define LLVM_ADT_ITERATOR
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#include <iterator>
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#undef HAVE_BI_ITERATOR
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#undef HAVE_STD_ITERATOR
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#undef HAVE_FWD_ITERATOR
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#ifdef _MSC_VER
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# define HAVE_BI_ITERATOR 0
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# define HAVE_STD_ITERATOR 1
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# define HAVE_FWD_ITERATOR 0
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#endif
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#if !HAVE_BI_ITERATOR
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# if HAVE_STD_ITERATOR
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/// If the bidirectional iterator is not defined, we attempt to define it in
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/// terms of the C++ standard iterator. Otherwise, we import it with a "using"
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/// statement.
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///
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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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using std::bidirectional_iterator;
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#endif
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#if !HAVE_FWD_ITERATOR
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# if HAVE_STD_ITERATOR
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/// If the forward iterator is not defined, attempt to define it in terms of
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/// the C++ standard iterator. Otherwise, we import it with a "using" statement.
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///
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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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using std::forward_iterator;
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#endif
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#endif
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