What’s the benefit of std::back_inserter over std::inserter?

Iterator types std::back_inserter returns std::back_insert_iterator that uses Container::push_back(). std::inserter returns std::insert_iterator that uses Container::insert(). std::list For lists std::list::push_back is almost the same as std::list::insert. The only difference is that insert returns iterator to inserted element. bits/stl_list.h void push_back(const value_type& __x) { this->_M_insert(end(), __x); } void _M_insert(iterator __position, const value_type& __x) { _Node* __tmp = _M_create_node(__x); … Read more

wrapping Scaffold with Container for gradient background, How to set gradient to container background in flutter?

You can also add a gradient to the AppBar like this, new Scaffold( appBar: AppBar( title: Center(child: Text(‘Awesome AppBar’)), flexibleSpace: Container( decoration: BoxDecoration( gradient: LinearGradient( colors: [ const Color(0xFF3366FF), const Color(0xFF00CCFF), ], begin: const FractionalOffset(0.0, 0.0), end: const FractionalOffset(1.0, 0.0), stops: [0.0, 1.0], tileMode: TileMode.clamp), ), ), child: …, ), body: …, ); LinearGradient parameters: … Read more

What exactly are “containers” in python? (And what are all the python container types?)

Containers are any object that holds an arbitrary number of other objects. Generally, containers provide a way to access the contained objects and to iterate over them. Examples of containers include tuple, list, set, dict; these are the built-in containers. More container types are available in the collections module. Strictly speaking, the collections.abc.Container abstract base … Read more

What is an iterator’s default value?

By convention a “NULL iterator” for containers, which is used to indicate no result, compares equal to the result of container.end(). std::vector<X>::iterator iter = std::find(my_vec.begin(), my_vec.end(), x); if (iter == my_vec.end()) { //no result found; iter points to “nothing” } However, since a default-constructed container iterator is not associated with any particular container, there is … Read more

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