* questions about cv-qualifier for function and references
@ 2010-12-02 4:52 zhang qingshan
2010-12-02 9:19 ` Jonathan Wakely
0 siblings, 1 reply; 2+ messages in thread
From: zhang qingshan @ 2010-12-02 4:52 UTC (permalink / raw)
To: gcc-help
std(N3126) 8.3.2/1 says that:
Cv-qualified references are ill-formed except when the cv-qualifiers
are introduced through
the use of a typedef (7.1.3) or of a template type argument (14.3), in
which case the cv-qualifiers are ignored.
Why the following code compiled failed on GCC 4.5.0 ?
template <typename T> void foo (T const &);
void baz ();
foo (baz);
while
template <typename T> void foo (T const &);
void baz ();
void Test() {
foo (baz);
}
successfully. Really wired.
another question is: what is cv-qualifier reference ? Your guys told me that:
const int &m; is not a cv-qualifier reference. Could you give me an
example on the cv-qualifier reference ? Thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: questions about cv-qualifier for function and references
2010-12-02 4:52 questions about cv-qualifier for function and references zhang qingshan
@ 2010-12-02 9:19 ` Jonathan Wakely
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Wakely @ 2010-12-02 9:19 UTC (permalink / raw)
To: zhang qingshan; +Cc: gcc-help
On 2 December 2010 04:52, zhang qingshan wrote:
> std(N3126) 8.3.2/1 says that:
>
> Cv-qualified references are ill-formed except when the cv-qualifiers
> are introduced through
> the use of a typedef (7.1.3) or of a template type argument (14.3), in
> which case the cv-qualifiers are ignored.
>
> Why the following code compiled failed on GCC 4.5.0 ?
> template <typename T> void foo (T const &);
> void baz ();
> foo (baz);
you can't call a function at namespace scope
This is the same as:
void foo() { }
foo();
The template and the reference has nothing to do with it.
> while
> template <typename T> void foo (T const &);
> void baz ();
> void Test() {
> foo (baz);
> }
>
> successfully. Really wired.
No, that's completely normal, at function scope you can call another function.
Like:
void foo() { }
void bar() {
foo();
}
> another question is: what is cv-qualifier reference ? Your guys told me that:
> const int &m; is not a cv-qualifier reference. Could you give me an
> example on the cv-qualifier reference ? Thanks.
int i = 0;
int& const cref = i; // error - cannot have cv-qualified reference
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2010-12-02 4:52 questions about cv-qualifier for function and references zhang qingshan
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