On Friday 20 February 2015 13:37:16 Matthew Woehlke wrote:
> On 2015-02-19 20:26, Thiago Macieira wrote:
> > Do NOT do this. This will crash:
> > for (auto const &item : std::cref(somefunction()) { ... }
>
> Does it crash without the std::cref?
No, due to lifetime extension of the temporary.
> If not... seems like a good argument to support a free 'const'...
>
> > And another reason is that std::cref is a C++11 Standard Library addition
> > and we cannot depend on that yet.
>
> ...but so is range-based for (and auto).
That's different, those are core language features and we have Q_COMPILER_xxx
for them.
Standard Library features are more difficult to detect and even the library
providers are lagging behind:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
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