1 //===-- Support/iterator - "Portable" wrapper around <iterator> -*- C++ -*-===//
3 // This file provides a wrapper around the mysterious <iterator> header file.
4 // In GCC 2.95.3, the file defines a bidirectional_iterator class (and other
5 // friends), instead of the standard iterator class. In GCC 3.1, the
6 // bidirectional_iterator class got moved out and the new, standards compliant,
7 // iterator<> class was added. Because there is nothing that we can do to get
8 // correct behavior on both compilers, we have this header with #ifdef's. Gross
11 // By #includ'ing this file, you get the contents of <iterator> plus the
12 // following classes in the global namespace:
14 // 1. bidirectional_iterator
15 // 2. forward_iterator
17 //===----------------------------------------------------------------------===//
19 #ifndef SUPPORT_ITERATOR
20 #define SUPPORT_ITERATOR
22 #include "Config/config.h"
26 //////////////////////////////////////////////////////////////////////////////
27 // If the bidirectional iterator is not defined, attempt to define it using
28 // the C++ standard iterator.
29 //////////////////////////////////////////////////////////////////////////////
30 #ifndef HAVE_BI_ITERATOR
31 #ifdef HAVE_STD_ITERATOR
33 // Define stupid wrappers around std::iterator...
34 template<class Ty, class PtrDiffTy>
35 struct bidirectional_iterator
36 : public std::iterator<std::bidirectional_iterator_tag, Ty, PtrDiffTy> {
40 #error "Need to have standard iterator to define bidirectional iterator!"
45 // Just use bidirectional_iterator directly.
46 using std::bidirectional_iterator;
50 //////////////////////////////////////////////////////////////////////////////
51 // If the forward iterator is not defined, attempt to define it using the
52 // C++ standard iterator.
53 //////////////////////////////////////////////////////////////////////////////
54 #ifndef HAVE_FWD_ITERATOR
55 #ifdef HAVE_STD_ITERATOR
56 template<class Ty, class PtrDiffTy>
57 struct forward_iterator
58 : public std::iterator<std::forward_iterator_tag, Ty, PtrDiffTy> {
61 #error "Need to have standard iterator to define forward iterator!"
64 // Just use forward iterator directly.
65 using std::forward_iterator;