On Sep 14, 12:37 pm, mathieu <[EMAIL PROTECTED]> wrote: > Now second try with concept checking: > > $ g++-4.2 -D_GLIBCXX_CONCEPT_CHECKS l.cxx > /usr/include/c++/4.2/bits/stl_algo.h: In function 'void > std::sort(_RandomAccessIterator, _RandomAccessIterator) [with > _RandomAccessIterator = std::_List_iterator<int>]': > l.cxx:7: instantiated from here > /usr/include/c++/4.2/bits/stl_algo.h:2829: error: no match for > 'operator-' in '__last - __first' > /usr/include/c++/4.2/bits/stl_algo.h: In function 'void > std::__final_insertion_sort(_RandomAccessIterator, > _RandomAccessIterator) [with _RandomAccessIterator = > std::_List_iterator<int>]': > /usr/include/c++/4.2/bits/stl_algo.h:2831: instantiated from 'void > std::sort(_RandomAccessIterator, _RandomAccessIterator) [with > _RandomAccessIterator = std::_List_iterator<int>]' > l.cxx:7: instantiated from here > /usr/include/c++/4.2/bits/stl_algo.h:2436: error: no match for > 'operator-' in '__last - __first' > /usr/include/c++/4.2/bits/stl_algo.h:2438: error: no match for > 'operator+' in '__first + 16' > /usr/include/c++/4.2/bits/stl_algo.h:2439: error: no match for > 'operator+' in '__first + 16' > /usr/include/c++/4.2/bits/boost_concept_check.h: In member function > 'void > __gnu_cxx::_Mutable_RandomAccessIteratorConcept<_Tp>::__constraints() > [with _Tp = std::_List_iterator<int>]': > /usr/include/c++/4.2/bits/boost_concept_check.h:63: instantiated > from 'void __gnu_cxx::__function_requires() [with _Concept = > __gnu_cxx::_Mutable_RandomAccessIteratorConcept<std::_List_iterator<int>>]'
This is the block that "concept checking" is producing to help you. Before, there was no message explicitly stating the problem: the algorithm you're calling requires a Mutable RandomAccessIterator. The point is to exhibit the actual cause of the problem, a requirement violation, as early as possible. Without the compiler support planned for C++09, there isn't much more the implementation can do. -- Pedro Lamarão _______________________________________________ help-gplusplus mailing list help-gplusplus@gnu.org http://lists.gnu.org/mailman/listinfo/help-gplusplus
