C1423: Constant member must be in initializer list

[ERROR]

There are constant members in the class/struct, that are not initialized with an initializer list in the object constructor.

  struct A {

  

    A();

  

    const int i;

  

  };

  

  A::A() : i(4) {  // initialize i with 4

  

  }

  

If a const or reference member variable is not given a value when it is initialized, it must be given a value in the object constructor.