CODEWITHSUNDEEP
c++arraysfunctionpointers
Vlad
Vlad

Reputation: 1601

Array of pointers to functions C++

I have 3 functions with the same signature. I need to initialize an array with pointers to functions. I have: 

typedef void(*sorting_func) (int* a, int n);

and functions:

class Sortings {
public:
    static void bubble_sort(int a[], int n);
    static void bubble_aiverson_1(int a[], int n);
    static void bubble_aiverson_2(int a[], int n);
};

I need an array with pointer in this class to use like this:

Sortings::array[0]...

Functions can be not static.

Upvotes: 0

Views: 158

Answers (1)

JBL
JBL

Reputation: 12907

You could use a vector of std::function, i.e.

std::vector<std::function(void(int*,int)>> sortingFunctions;

Then, depending on the case you can directly push back free functions, or use a lambda to push back a member function the following way:

//Capturing `this` in the lambda implies the vector is a member of the class
//Otherwise, you must capture an instance of the class you want to call the 
//function on.
std::function<void(int*,int)> myMemberFunction = [this](int* a, int n){
    this->memberFunction(a,n);
}

sortingFunctions.push_back(myMemberFunction);

assuming you create the vector in a member function of your Sorting class.

See a live example here

Upvotes: 2

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