在向量C ++ 11中访问引用包装器元素

Question

In Graph class:

typedef std::pair<double, Node&> PIRV;

In another class that uses graph:

typedef std::priority_queue<Graph::PIRV&, vector<std::reference_wrapper<Graph::PIRV>>, compareEdge> PECMP;

Now I am trying to access the first element in the priority queue ( PECMP someQueue ) by doing

double a = someQueue.top().first

However I get the following error:

error: ‘const value_type’ has no member named ‘first’

What is the better way to access elements stored in reference wrapper? Thanks

Answer 1

Problem solved :

There is a get method in the std::reference_wrapper class which allows one to obtain the element store in there