On Thu, Jul 7, 2011 at 9:41 PM, Adam Merz <adammerz@hotmail.com> wrote:
Jeffrey Lee Hellrung, Jr. <jeffrey.hellrung <at> gmail.com> writes:
<snip> What is a "standard conversion sequence"?
It's one of three classifications of conversion sequences; it would take copy/pasting most of ยง13.3.3.1 to define fully. The important part is that it's a better overload candidate than an ellipsis conversion sequence.
Well arguably just as important is that there *is* a standard conversion sequence from an int to int const volatile &. Just to confirm, on MSVC9, the following compiles: int f(int const volatile &); //void f(...); // * int g(); int main(int argc, char* argv[]) { sizeof(f(g())); } ...but if you uncomment line *, error C2070: 'void': illegal sizeof operand So, right, MSVC (and, evidently, GCC) are preferring the (...) overload to (int const volatile &), even though the (int const volatile &) can legitimately be bound to the int rvalue. Maybe some compiler workarounds will have to introduced into these extended type traits to deal with const volatile & return types...
[ I don't have a copy of the standard; if it's freely available on the
internet somewhere, freely point me in the right direction :) ]
It's ~$450 USD from the ISO committee if I recall correctly, but I can't imagine it would be that hard to find...
Yes, this is what I remember running into some time ago; a google search now directed me to Herb Sutter's blog, which directed me to the ANSI page selling the pdf for $30, which is (almost) free relative to $450 (and within my student budget). But now with C++0x available on the horizon... - Jeff