Implicit integer type declarations

The use of an implicit int in a declaration, as shown in Figure 1, does not comply with Standard C++. If you need to comply with the Standard C++, specify the type of every function and variable. Otherwise, use the LANGLVL(IMPLICITINT) option to compile code containing declarations of implicit integer types.

Figure 1. Declaration of implicit integer type.

    const i;   // previously meant const int i
    main() { } // previously returned int

As of z/OS® V1R2 C++, the following code is no longer valid:

    inline f() {
        return 0;
    }