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* [Bug c++/44320] New: ADL names are looked up in namespaces that are only referenced by template arguments
@ 2010-05-29 7:41 sstrasser at systemhaus-gruppe dot de
2010-05-29 7:45 ` [Bug c++/44320] " sstrasser at systemhaus-gruppe dot de
2010-05-29 9:31 ` paolo dot carlini at oracle dot com
0 siblings, 2 replies; 3+ messages in thread
From: sstrasser at systemhaus-gruppe dot de @ 2010-05-29 7:41 UTC (permalink / raw)
To: gcc-bugs
I believe that the following is a bug. it is accepted by MSVC and comeau.
GCC seems to ADL-lookup names in namespaces that are only used in the template
arguments of the function arguments, for example:
A<otherns::type> a;
adl_func(a); //otherns::adl_func is called
this can cause unintended conflicts with non-function names in "otherns", e.g.
if the ADL function is called "apply" and the argument type happens to be a
template instantiated with a type from namespace boost::mpl, only the fact that
a header containing the type boost::mpl::apply is included can cause a compile
error.
here's a simplified test case that causes a conflict:
namespace mpl{
class apply{};
class vector{};
}
template<class T>
void apply(T const &){}
template<class T>
class A{};
int main(){
A<mpl::vector> a;
apply(a);
}
--
Summary: ADL names are looked up in namespaces that are only
referenced by template arguments
Product: gcc
Version: 4.3.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sstrasser at systemhaus-gruppe dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44320
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/44320] ADL names are looked up in namespaces that are only referenced by template arguments
2010-05-29 7:41 [Bug c++/44320] New: ADL names are looked up in namespaces that are only referenced by template arguments sstrasser at systemhaus-gruppe dot de
@ 2010-05-29 7:45 ` sstrasser at systemhaus-gruppe dot de
2010-05-29 9:31 ` paolo dot carlini at oracle dot com
1 sibling, 0 replies; 3+ messages in thread
From: sstrasser at systemhaus-gruppe dot de @ 2010-05-29 7:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from sstrasser at systemhaus-gruppe dot de 2010-05-29 07:45 -------
a workaround (other than renaming the ADL function) would be appreciated
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44320
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/44320] ADL names are looked up in namespaces that are only referenced by template arguments
2010-05-29 7:41 [Bug c++/44320] New: ADL names are looked up in namespaces that are only referenced by template arguments sstrasser at systemhaus-gruppe dot de
2010-05-29 7:45 ` [Bug c++/44320] " sstrasser at systemhaus-gruppe dot de
@ 2010-05-29 9:31 ` paolo dot carlini at oracle dot com
1 sibling, 0 replies; 3+ messages in thread
From: paolo dot carlini at oracle dot com @ 2010-05-29 9:31 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from paolo dot carlini at oracle dot com 2010-05-29 09:30 -------
Works fine in 4_5-branch and mainline, the behavior in 4_3-branch and
4_4-branch isn't a regression in any way, as fas as I can see.
--
paolo dot carlini at oracle dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Known to work| |4.5.0 4.5.1 4.6.0
Resolution| |WORKSFORME
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44320
^ permalink raw reply [flat|nested] 3+ messages in thread
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2010-05-29 7:41 [Bug c++/44320] New: ADL names are looked up in namespaces that are only referenced by template arguments sstrasser at systemhaus-gruppe dot de
2010-05-29 7:45 ` [Bug c++/44320] " sstrasser at systemhaus-gruppe dot de
2010-05-29 9:31 ` paolo dot carlini at oracle dot com
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