Using std::function in std::map

Question

I want use a std::function in std::map, follow the code:

#include <functional>
#include <map>

class MyClass {
    ...
    std::function<void()> Callback();
    std::map<std::string, Callback> my_map;
    ...
}

std::map receive a Key and a T, but a not knew whats mistake in my code, him no access the std::map functions(insert, end, find...)

Using typedef, him run.But why std::function not run?

I firts place: whats the problem?

Before: How to solve it? --code sample please =D;

Thanks by help

How do you insert a member method into the my_map? – att Jan 29 '20 at 06:57 — att, Jan 29 '20 at 06:57

score 15 · Accepted Answer · answered Mar 21 '15 at 15:31

15

You've declared Callback to be a function (returning std::function), not a type. You need a type to declare what you're storing in the map. I guess you want

typedef std::function<void()> Callback;

answered Mar 21 '15 at 15:31

Mike Seymour

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Working fine after typedef. – Nandini Chaurasiya May 25 '22 at 09:26

score 0 · Answer 2 · edited May 25 '22 at 10:19

0

There is one more way of declaring map, having class function ptr.

If you don't want to use typedef.

std::map<std::string, void (MyClass::*)()> my_map;

edited May 25 '22 at 10:19

user438383

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answered May 25 '22 at 10:15

Nandini Chaurasiya

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Using std::function in std::map

2 Answers2