Renaming first and second of a map iterator

user_281655 0
Viewed 10371

Is there any way to rename the first and second accessor functions of a map iterator. I understand they have these names because of the underlying pair which represents the key and value, but I'd like the iterators to be a little more readable. I think this might be possible using an iterator adaptor, but I'm not sure how to implement it.

Please note that I can't use boost.

Example of what I mean:

map<Vertex, Edge> adjacency_list;
for(map<Vertex, Edge>::iterator it = adjacency_list.begin();
    it != adjacency_list.end();
    ++it)
{
    Vertex v = it->first;
    //instead I would like to have it->vertex
}
iterator map stl c++
8 Answers

If you don't need the iterator (e.g., a range-based for loop suits your purpose), then as of c++17 you can use structured bindings:

map<Vertex, Edge> adjacency_list;
for( auto & [ vertex, edge ] : adjacency_list )
{
    // do stuff with vertex
}
user_27692710
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