How to create an unordered_map for string to function

Question

class MyObject{ public: void testFunctionMap(){ std::unordered_map<std::string, std::function<void()> > functionMap; std::pair<std::string, std::function<void()> > myPair("print", std::bind(&MyObject::printSomeText, this) ); functionMap.insert( myPair ); functionMap["print"](); } void printSomeText() { std::cout << "Printing some text"; } }; MyObject o; o.testFunctionMap();

This works fine. Is there another way to use the MyObject::printSomeText function as the value for the pair?

Kerrek SB · Accepted Answer · 2012-01-20 04:04:06Z

Yes, a pointer-to-member-function:

std::unordered_map<std::string, void(MyObject::*)()> m; m["foo"] = &MyObject::printSomeText; // invoke: (this->*m["foo"])();

This only allows you to call the member function on the current instance, rather than on any given MyObject instance. If you want the extra flexibility, make the mapped type a std::pair<MyObject*, void(MyObject::*)()> instead.

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