c++ - 自定义对象容器的迭代器

Question

如果我构建了一个我想包含在其中的类，例如一个集合，我将如何遍历该集合？我能说吗

 std::set<customObject>::iterator it

我以为我可以做到，但我遇到了以下一系列错误......

drawing.h:110: error: no match for ‘operator=’ in ‘it = ((object*)this)->object::objects. std::vector<_Tp, _Alloc>::begin [with _Tp = object, _Alloc = std::allocator<object>]()’
/usr/include/c++/4.2.1/bits/stl_tree.h:225: note: candidates are: std::_Rb_tree_const_iterator<object>& std::_Rb_tree_const_iterator<object>::operator=(const std::_Rb_tree_const_iterator<object>&)
drawing.h:110: error: no match for ‘operator!=’ in ‘it != ((object*)this)->object::objects. std::vector<_Tp, _Alloc>::end [with _Tp = object, _Alloc = std::allocator<object>]()’
/usr/include/c++/4.2.1/bits/stl_tree.h:292: note: candidates are: bool std::_Rb_tree_const_iterator<_Tp>::operator!=(const std::_Rb_tree_const_iterator<_Tp>&) const [with _Tp = object]
drawing.h:111: error: ‘struct std::_Rb_tree_const_iterator<object>’ has no member named ‘sketch’

这是我的代码:

void draw_in_place()
        {
            place();
            std::set<object>::const_iterator it;
            for(it = objects.begin(); it != objects.end(); it++){
                *it.draw_in_place();
            }
        }

Answer 1

((object*)this)->object::objects. std::vector<_Tp, _Alloc>::begin

objects显然是 std::vector<object> , 不是 std::set<object> .因此，您需要使用 std::vector<object>::const_iterator .

*it.draw_in_place();

这是不正确的:您需要先取消引用迭代器以访问元素，然后再使用元素:

(*it).draw_in_place();
// or
it->draw_in_place();