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Ron Natalie
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 Posted: Fri Jul 25, 2003 2:22 pm Post subject: Re: volatile type copy constructor |
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"Gwang Sik Yoon" <gsyoon (AT) salmosa (DOT) kaist.ac.kr> wrote
| Quote: | The following code is meant to assign a volatile return value to a
variable. But the compiler can't find the seemingly correct copy
constructor. Interestingly, there's no problem in assigning a volatile
variable to a variable.
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I think you may want an
X(const volatile&)
copy constructor. The return value is an rvalue and can't be bound
to a non-const reference.
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Gwang Sik Yoon
Guest
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| Posted: Mon Aug 04, 2003 8:24 am Post subject: Re: volatile type copy constructor |
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"Ron Natalie" <ron (AT) sensor (DOT) com> wrote
| Quote: | "Gwang Sik Yoon" <gsyoon (AT) salmosa (DOT) kaist.ac.kr> wrote
The following code is meant to assign a volatile return value to a
variable. But the compiler can't find the seemingly correct copy
constructor. Interestingly, there's no problem in assigning a volatile
variable to a variable.
I think you may want an
X(const volatile&)
copy constructor. The return value is an rvalue and can't be bound
to a non-const reference.
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I tried that also and failed. 
Your last sentence seems to imply that
const volatile X h() {.... } ;
const volatile X var_a = h() ;
should work.
var_a is a const reference. isn't it?
However, it doesn't work either.
Am I missing or mis-interpreting something here?
Can you give me some references for your last sentece?
I have read a few books on C++ such as The C++ Programming Language,
C++ FAQs, etc, but can't remember any phrases that
say volatiles are rvalues.
Thanks for your help again. :)
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