Building an unordered map with tuples as keys

Question

In a C++ program with Boost, I am trying to build an unordered map whose keys are tuples of doubles:

typedef boost::tuples::tuple

        

Answer 1

Have you tried using this:

#include "boost/functional/hash.hpp"
#include 
#include 

using Edge = std::tuple;

struct KeyHash {
    std::size_t operator()(const Edge & key) const {
        return boost::hash_value(key);
    }
};

using EdgeMap = std::unordered_map;

please notice I am using std for tuple and unordered_map.

You can see full code with using even lambda on this Compiler Explorer link.