Re: How to make this exception-safe

From:
Triple-DES <DenPlettfrie@gmail.com>
Newsgroups:
comp.lang.c++.moderated
Date:
Mon, 24 Nov 2008 16:02:01 CST
Message-ID:
<2a59dab1-3f9d-47f0-bdeb-d8a8812588c0@g38g2000yqn.googlegroups.com>
On 22 Nov, 00:54, "Thomas Beckmann" <ka6552-...@online.de> wrote:

V:V() : v_(3u)
{
    try {
        v_[0u] = new C(2);
        v_[1u] = new C(1);
        v_[2u] = new C(3);
    } catch {
        delete v_[2u];
        delete v_[1u];
        delete v_[0u];
        throw;
    }

}

What's wrong with this? Looks solid, easily readable and thus maintainable
to me.


Nothing wrong with it really, I just prefer avoiding try/catch blocks
with manual resource management whenever an RAII solution is
feasible.

Mostly making a templated pointer container available in your code base pays
off shortly when dealing with non-value types.

Sorry, it is essential that it is written entirely in Standard C+
+(03).


In what way is a smart pointer or a pointer container non-Standard C++?


Of course they are.

However, in this particular case, the ideal solution is the one which
leads to the smallest net increase in code. For a very small number of
objects, that would be my solution or yours (adding 2n lines of code
for n objects). For a slightly larger number, some of the other
solutions will scale better, requiring n + c LoC for n objects, or
even c, like Yechezkel's solution.

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