| //===-- llvm/ADT/iterator - Portable wrapper around <iterator> --*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| // The #if directives' expressions are filled in by Autoconf. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_ADT_ITERATOR |
| #define LLVM_ADT_ITERATOR |
| |
| #include <iterator> |
| |
| #undef HAVE_BI_ITERATOR |
| #undef HAVE_STD_ITERATOR |
| #undef HAVE_FWD_ITERATOR |
| |
| #ifdef _MSC_VER |
| # define HAVE_BI_ITERATOR 0 |
| # define HAVE_STD_ITERATOR 1 |
| # define HAVE_FWD_ITERATOR 0 |
| #endif |
| |
| #if !HAVE_BI_ITERATOR |
| # if HAVE_STD_ITERATOR |
| /// If the bidirectional iterator is not defined, we attempt to define it in |
| /// terms of the C++ standard iterator. Otherwise, we import it with a "using" |
| /// statement. |
| /// |
| 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 |
| using std::bidirectional_iterator; |
| #endif |
| |
| #if !HAVE_FWD_ITERATOR |
| # if HAVE_STD_ITERATOR |
| /// If the forward iterator is not defined, attempt to define it in terms of |
| /// the C++ standard iterator. Otherwise, we import it with a "using" statement. |
| /// |
| 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 |
| using std::forward_iterator; |
| #endif |
| |
| #endif |