How to initialize `std::function` with a member-function?

by

print_add is a non-static member function of foo, which means it must be invoked on an instance of Foo; hence it has an implicit first argument, the this pointer.

Use a lambda that captures the foo instance and invokes print_add on it.

Foo foo;
test([&foo](int i){ foo.print_add(i); });

Another option is to use std::bind to bind the foo instance:

test(std::bind(&Foo::print_add, &foo, std::placeholders::_1));

Live demo

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