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Re: typeof throws away the reference



On Jan 28, 2005, at 10:04 AM, Giovanni Bajo wrote:


Jari Petter Sundell <jaris@student.matnat.uio.no> wrote:

Compiling the following on g++-3.3 and 3.5-tree-ssa does not give a
"could not convert `0' to ` int&'" for either of the assignments. Why
doesn't typeof preserve the reference?

int& f();

int main() {
  int& a = f();

  typeof(a) r = 0;
  typeof(f()) s = 0;
}


Because our implementation of typeof is the so-called "reference-dropping
typeof". There are pros and cons. This document should give you some clue:
http://www.osl.iu.edu/~jajarvi/publications/papers/ decltype_revisited_n1527.pdf
(not sure if it's the last version).


Also this is PR 10243.


-- Pinski



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