Re: Workaround for compiler bug: Value-initialization in new-expression

"Carl Daniel [VC++ MVP]" <>
Thu, 17 May 2007 06:46:12 -0700
Niels Dekker - no return address wrote:

Carl Daniel [VC++ MVP] wrote:

Niels Dekker - no return address wrote:

It's often very important to have our data properly initialized. So
hopefully the status of bug report 100744 is going to be
reconsidered soon!

I don't want to crush your hopes, but realistically, unless this is a
serious issue for you that you persue through PSS, it's unlikely that
a fix will be made in the next 2 years or more

I just thought of another workaround... Again, suppose that struct A
is defined as in

 struct A {
   std::string s;
   int i;

Now it was reported that VC++ does not properly initialize A::i when
 A *pa = new A();

So instead I made a class GetInitializedAggregate, so that the
following will do the job:
 A *pa = new A( GetInitializedAggregate() );

The class GetInitializedAggregate is implemented as follows:

 class GetInitializedAggregate {
   template <typename T> operator T() const {
     T result = {};
     return result;

The conversion operator T() returns a properly initialized object, for
any aggregate type T. In that way, the expression
GetInitializedAggregate() "automagically" delivers an initialized
aggregate of the right type. :-)

Any comments, please? Is this technique presented elsewhere already?

That looks like it ought to work. It does potentially carry with it the
cost of what amounts to double-initialization (or possible triple, depending
on the optimizations the compiler can sneak in).

I don't recall seeing that technique before, but I can't say if it's been
presented elsewhere - there's so many elsewheres!


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