Re: Having at semantic for []

[Paul Pluzhnikov]

Marc Boyer <Marc.Boyer@enseeiht.yahoo.fr.invalid> writes:

> is there a way to ask g++ to give the semantics of 
> vector::at() (ie checking bounds) to vector::operator[]
> in some 'debug mode'.

For recent versions of g++ (3.4.0 and above), -D_GLIBCXX_DEBUG
finds this error (and many others):

$ cat junk.cc
#include <vector>
typedef std::vector<int> VI;

int main() {
   VI vi; vi.push_back(1);
   int x = vi[1]; // bug
}

$ /usr/local/gcc-3.4.6/bin/g++ -g junk.cc -D_GLIBCXX_DEBUG && ./a.out
/usr/local/gcc-3.4.6/include/c++/3.4.6/debug/vector:192:
    error: attempt to subscript container with out-of-bounds index 1, but     
    container only holds 1 elements.

Objects involved in the operation:
sequence "this" @ 0x0xbfffdf90 {
  type = N15__gnu_debug_def6vectorIiSaIiEEE;
}
Aborted (core dumped)

Cheers,
-- 
In order to understand recursion you must first understand recursion.
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