Passing an array of unknown size to class constructor

I am trying to write a function CycleManager which can hold an array of Cycles. My problem is that I want this class to be able to hold a variable amount of cycles. This is what I came up with, but it's not working.

Cycle.h

class Cycle
{
public:
    Cycle(std::string name) : name(name) {}

private:
    std::string name;
};

CycleManager.h

#include "Cycle.h"

class CycleManager
{
public:
    CycleManager(Cycle (&cycles)[]);
    void getCycles();

private:
    int currentCycle;
    int numberOfCycles;
    Cycle (&cycles)[];
};

CycleManager.cpp

CycleManager::CycleManager(Cycle (&cycles)[]) : cycles(cycles), currentCycle(0)
{
    numberOfCycles = sizeof(*cycles) / sizeof(Cycle);
}

void CycleManager::getCycles()
{
    // Serial.println(this->numberOfCycles);
    std::cout << this->numberOfCycles << std::endl;
}

Main.cpp

Cycle cycles[] = {Cycle("Cycle 1"), Cycle("Cycle 2"), Cycle("Cycle 3")};
CycleManager cycleManager(cycles);

int main()
{
    cycleManager.getCycles();
    return 0;
}