#include <Arduino.h>

//Class with no default constructor, as given in the asker's question.
class MyClass
{
public:
static const unsigned int dimension = 5;
void (*myFunctions[dimension])();
};

//If the "test" object is declared globally, it will always have nullptr initialized values.
//MyClass test;

void setup()
{
    Serial.begin(9600);
    while(!Serial);

    //If initialized like this, "test" WILL have uninitialized function pointers! Bad!
    MyClass test;
    //If initialized like this, "test" WILL NOT have uninitialized data!
    //MyClass test = {};
    // ==> It depends on whether the class has a constructor and how the object is declared
    // ==> always initialize to nullptr in constructor.


    for(auto x : test.myFunctions) {
        if(x == nullptr) {
            Serial.println("Good Null pointer.");
        } else {
            Serial.println("Functionpointer pointing to uninitialized data!");
        }
    }
}

void loop() { }