Re: How to Call "Constructor with parameter" after new [] allocation?

From:
Jiang <goo.mail01@yahoo.com>
Newsgroups:
comp.lang.c++.moderated
Date:
Wed, 24 Sep 2008 07:46:02 CST
Message-ID:
<cb739d1a-e7d1-477d-b18e-99118c9b0a99@k36g2000pri.googlegroups.com>
On Sep 23, 9:27 am, Alberto Ganesh Barbati <AlbertoBarb...@libero.it>
wrote:

[...]

So, when allocating an array T[n], only these two syntaxes are legal:

  new T[n]; // #1 new-initializer omitted
  new T[n](); // #2 new-initializer is ()

there is no third case.


Well, we can add the third case using placement new:

    T mem[N]; // or dynamical allcation
    T* arr = new (mem) T[n];

Although I do not think it is a good method, but if
the pre-allocated memory can be initialized and the arr
can just use the initialized value in my mind.

On the other hand, new-expressions to allocate arrays is a very
error-prone technique that should be strongly discouraged except when
programming at a very low-level. It's much better to use a container and
std::vector in particular.


which is quite true in my mind.

If heap allocation is not an issue and the array size can
be estimated then std::tr1::array is another choice:

   std::tr1::array<int,3> arr = {{1,2,3}};

Since the array class is an aggregate, we can specify different
values in the initializer.

Ganesh


Jiang

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