C++ Arduino: assign a Function to function pointer [duplicate]

Question

I have a class that contains two similar non-static functions, I want to assign one of them on the fly to a function pointer:

A.h:

class A{
    private:
    void (*funcPtr)(int);
    void do_sth(int i);
    void do_sth_else(int i);
}

A.cpp:

A::A(int i){
    if(i == 1)
        A::funcPtr = A::do_sth; // or &A::do_sth;
    else 
        A::funcPtr = A::do_sth_else; // or &A::do_sth_else;
}

But I get such error:

error: cannot convert 'A::do_sth' from type 'void (A::)(int)' to type 'void (*)(int)'

I read multiple similar issues, But cannot apply their solutions on my problem.

Considering Arduino's memory limitations, function pointers may be a bit overcomplicated. If the compiler can handle it though, why not use lambdas? — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Jun 21, 2016 at 15:57

lorro · Accepted Answer · 2016-06-21 15:47:22Z

1

These are member functions. Either make funcPtr a member pointer by qualifying it with class name, or make do_sth(), do_sth_else() static member functions. I'd suggest using & in front of function name when taking the address of it.

answered Jun 21, 2016 at 15:47

lorro

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