Static C++

static keyword can be applied to local variables, functions, class’ data members and objects in C++. static local variable retain their values between function call and initialized only once.

#include class Test { public:     Test()     {         std::cout << "Constructor is executed\n";     }     ~Test()     {         std::cout << "Destructor is executed\n";     } }; void myfunc() {     static Test obj; } // Object obj is still not destroyed because it is static   int main() {     std::cout << "main() starts\n";     myfunc();    // Destructor will not be called here     std::cout << "main() terminates\n";     return 0; }

Output:

main() starts
Constructor is executed
main() terminates
Destructor is executed 

As an experiment if we remove the static keyword from the global function myfunc(), we get the output as below:

main() starts
Constructor is called
Destructor is called
main() terminates

How about global static objects?
The following program demonstrates use of global static object.

#include class Test { public:     int a;     Test()     {         a = 10;         std::cout << "Constructor is executed\n";     }     ~Test()     {         std::cout << "Destructor is executed\n";     } }; static Test obj; int main() {     std::cout << "main() starts\n";     std::cout << obj.a;     std::cout << "\nmain() terminates\n";     return 0; }

Output:

Constructor is executed
main() starts
10
main() terminates
Destructor is executed