Mathias Gaunard wrote:
Thomas Klimpel wrote:
Until recently, I thought that the "perfect forwarding" problem was a technical defect of C++03, but then I read through the following:
Perfect forwarding works just fine (for a certain definition of fine) in C++03, it just requires an exponential number of overloads as the number of arguments increases and doesn't forward rvalue-ness but only types and const-ness, but since C++03 can't officially detect rvalue-ness anyway that's irrelevant.
Perfect forwarding in C++03 works just fine for references and const-references, but it doesn't work fine for a function that takes it's arguments by value. You can try to approximate it by using a const reference, but then you loose rvalue-ness.
I don't really see how that article has a link to perfect forwarding.
The article explains "copy elision" and RVO, and hence explains why taking argument by value is closely related to rvalue-ness. So it shows why the statement "..., but since C++03 can't officially detect rvalue-ness anyway that's irrelevant" is not the complete truth. Regards, Thomas