A Class that Counts the Number of Instances - C++ Class

C++ examples for Class:static member

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Description

A Class that Counts the Number of Instances

Demo Code

#include <iostream>

using namespace std;

class MyClass//from w w w .j a  v a 2  s. co m
{
private:
    static int s_Counter;

    int* intValue{ &s_Counter };

public:
    MyClass()
    {
        ++(*intValue);
    }

    ~MyClass()
    {
        --(*intValue);
        intValue = nullptr;
    }

    int GetValue() const
    {
        return *intValue;
    }
};

int MyClass::s_Counter{ 0 };

int main()
{
    auto object1 = MyClass();
    cout << object1.GetValue() << endl;

    {
        auto object2 = MyClass();
        cout << object2.GetValue() << endl;
    }

    auto object3 = MyClass();
    cout << object3.GetValue() << endl;

    return 0;
}

Result


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