| //===-- Support/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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #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 |