Re: Some errors in MIT's intro C++ course

From:
SG <s.gesemann@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Sat, 11 Sep 2010 15:05:50 -0700 (PDT)
Message-ID:
<cc6d9ac0-cf41-495e-80b3-1015ac0c99a3@k9g2000vbo.googlegroups.com>
On 11 Sep., 23:03, Jorgen Grahn wrote:

On Sat, 2010-09-11, James Kanze wrote:

On Sep 10, 8:50 pm, Juha Nieminen wrote:

In which system does accessing a vector out of boundaries
"safely crash" for sure?


Windows, when using VC++. Linux (and all of the other
Unices), when using g++.


What did you do to the real James Kanze?

    salix:/tmp% cat foo.cc
    #include <vector>
    #include <iostream>

    int main()
    {
        int bar[] = { 3, 3, 1, 8, 2 };
        std::vector<int> foo(bar, bar+5);
        for(unsigned i=0; i<10; ++i) {
            std::cout << foo[i] << '\n';
        }
        return 0;
    }
    salix:/tmp% g++ -W -Wextra -pedantic -std=c++98 -o foo foo.cc
    salix:/tmp% ./foo =

          

    3
    3
    1
    8
    2
    0
    135137
    0
    0
    0
    salix:/tmp%

Possibly I'm missing some context here, e.g. if you were talking about
special debug builds.


Maybe.

Although students should know what guarantees the C++ standard makes
and what is compiler-specific, I think they should also be familiar
with the compiler's documentation they are working with. This includes
a possible debug mode the implementation may offer.

http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug_mode.html

Cheers!
SG

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