Bug#237207: g++-3.3: Warning about useless casts

[Sebastian Andersson <sa@hogia.net>]

Package: g++-3.3
Version: 1:3.3.3-1
Severity: wishlist


It would be nice if there was an option to add a warning about
"useless" casts. Although they are not really incorrect, they
might become incorrect/inefficient as the program evolves. Ie;

struct A { int a; };
struct B : A { int b; };
void func(A *a) { ++a; } 

int main(int ac, char **av)
{
    A a;
    B b;

    func((A*)&a); // Useless cast since a already is an A.
    func(static_cast<A*>(&a)); // Just as useless.
    func((A*)&b); // Useless cast since b is a kind of A.
    func(static_cast<A*>(&b)); // Just as useless.

    return 0;
}

-- System Information:
Debian Release: testing/unstable
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.4.21-xfs
Locale: LANG=sv_SE, LC_CTYPE=sv_SE

Versions of packages g++-3.3 depends on:
ii  gcc-3.3                     1:3.3.3-1    The GNU C compiler
ii  gcc-3.3-base                1:3.3.3-1    The GNU Compiler Collection (base 
ii  libc6                       2.3.2.ds1-11 GNU C Library: Shared libraries an
ii  libstdc++5-3.3-dev          1:3.3.3-1    The GNU Standard C++ Library v3 (d

-- no debconf information