Re: The best way to retrieve a returned value... by const reference?
Niels Dekker - no return address wrote:
Thanks to all of you for your replies so far!
const Foo& constReference = GetFoo(); // Choice #1
const Foo constValue = GetFoo(); // Choice #2
Personally, I have the habbit to bind such an object to a
const-reference (choice #1). Thereby I hope to avoid an expensive
copy-construction, which /might/ take place when you use
copy-initialization (choice #2).
Pete Becker wrote:
I don't think that this avoids the copy. The returned value has to
live somewhere in the current stack frame, so it has to be copied
into a temporary object, where "copied" means the same things as in
When I use the option "-fno-elide-constructors" on GCC 4.3.2, choice #1
/does/ avoid a copy.
Okay, when you tell the compiler not to take advantage of legal
optimizations, it doesn't do them. <g> I'd rather spend my time writing
code than figuring out how to work around suboptimal compiler option
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of
"The Standard C++ Library Extensions: a Tutorial and Reference"
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