test.cpp

#include <cstdio>


class Foo {
    public:
        Foo(int x): v(x) {}
        Foo(const Foo &f) = delete;
        Foo &operator>> (int x) { v >>= x; return *this; }
        Foo &operator>>=(int x) { v >>= x; return *this; }

        operator int(void) const { return v; }


    private:
        int v;
};


int main(void)
{
    Foo       mf0(2), mf1(2);
    const Foo cf0(2), cf1(2);

    printf("%i\n", (int)(mf0 >>  1)); // Emits "1"
    printf("%i\n", (int)mf0);         // Emits "1"

    printf("%i\n", (int)(mf1 >>= 1)); // Emits "1"
    printf("%i\n", (int)mf1);         // Emits "1"

    printf("%i\n", (int)(cf0 >>  1)); // Emits "1"
    printf("%i\n", (int)cf0);         // Emits "2"

    printf("%i\n", (int)(cf1 >>= 1)); // Error
    printf("%i\n", (int)cf1);

    return 0;
}