Re: RFC: New C++ Attribute: final

[Gabriel Dos Reis <gdr at integrable-solutions dot net>]

Joe Buck <Joe.Buck@synopsys.com> writes:

| On Wed, Mar 03, 2004 at 01:42:42AM +0100, Gabriel Dos Reis wrote:
| > But, the pointer to member is a *constant*, in a given scope with
| > defined lifetime.  That GCC does not take advantage of that is another
| > problem. 
| 
| Consider this testcase:


    struct A {
       int f() { return 7; }
    };

    template<class T>
    inline int
    apply(A* p, T f)
    {
       return (p->*f)();
    }

    int main()
    {
       A tab[20];
       for (int i = 0; i < 20; ++i)
          apply(tab + i, &A::f);
    }


[...]

| out.  And sure enough, with -O2, GCC 3.3.3 doesn't leave any indirect
| or direct call to std::string::length around.

Look carefully at the assembly generated.

-- Gaby