C++/libstdc++: new "statement with no effect" warnings

[Paolo Carlini]

Gerald Pfeifer wrote:

>Today (or very recently) I started getting a warning
>  x.cc:10: warning: statement with no effect
>for the following code when compiling with -Wall:
>
>  1 #include <vector>
>  2
>  3 using namespace std;
>  4
>  5 typedef unsigned U;
>  6 typedef vector<unsigned> V;
>  7
>  8 int main() {
>  9  U *u = new U[43];
> 10  V *v = new V[43]; // warning: statement with no effect
> 11
> 12  delete[] u;
> 13  delete[] v;
> 14  }
>
>What's the problem here?
>
A few pointers:

    http://gcc.gnu.org/ml/gcc-bugs/2002-01/msg00119.html
    http://gcc.gnu.org/ml/gcc-patches/2002-01/msg00251.html
    http://gcc.gnu.org/ml/gcc-patches/2002-01/msg00041.html

Cheers,
Paolo.




>
>
>Gerald
>


-- 
Paolo Carlini
Dipartimento di Scienze Ambientali
Università degli Studi della Tuscia
Largo dell'Università , I-01100, Viterbo, ITALY