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* [Bug c++/32408] New: Template Parsing Error
@ 2007-06-19 20:22 chsalvia at gmail dot com
2007-06-19 21:22 ` [Bug c++/32408] " schwab at suse dot de
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: chsalvia at gmail dot com @ 2007-06-19 20:22 UTC (permalink / raw)
To: gcc-bugs
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GCC may have a defective template parsing routine which seems to mistake the
'<' token in an expression for the beginning of a template argument. The error
only seems to happen when a templated function evaluates a member of a
templated class or struct with a '<' symbol.
Here is a simple code snippet that reproduces the problem:
template <class T>
struct templated_struct
{
int count;
};
template <class T>
int template_func()
{
templated_struct<T> s;
if (s.count < 0) return 0;
return 0;
}
int main()
{
template_func<int> ();
return 0;
}
The compiler generates the follow error message when trying to compile the
above code:
test4.cc: In function int template_func():
test4.cc:16: error: parse error in template argument list
test4.cc: In function int template_func() [with T = int]:
test4.cc:22: instantiated from here
test4.cc:16: error: count is not a member template function
Note that the above code compiles just fine if you replace the '<' token in the
IF statement with an '>' or an '==', thus demonstrating that GCC seems to be
confusing the '<' token for a template argument.
A temporary workaround is to put a set of parenthesis around s.count.
--
Summary: Template Parsing Error
Product: gcc
Version: 4.1.2
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: chsalvia at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32408
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/32408] Template Parsing Error
2007-06-19 20:22 [Bug c++/32408] New: Template Parsing Error chsalvia at gmail dot com
@ 2007-06-19 21:22 ` schwab at suse dot de
2007-06-19 22:04 ` pcarlini at suse dot de
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: schwab at suse dot de @ 2007-06-19 21:22 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from schwab at suse dot de 2007-06-19 21:22 -------
*** Bug 32409 has been marked as a duplicate of this bug. ***
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32408
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/32408] Template Parsing Error
2007-06-19 20:22 [Bug c++/32408] New: Template Parsing Error chsalvia at gmail dot com
2007-06-19 21:22 ` [Bug c++/32408] " schwab at suse dot de
@ 2007-06-19 22:04 ` pcarlini at suse dot de
2007-06-19 23:08 ` chsalvia at gmail dot com
2007-06-19 23:10 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: pcarlini at suse dot de @ 2007-06-19 22:04 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pcarlini at suse dot de 2007-06-19 22:04 -------
Apparently you provided the wrong snippet, this one compiles just fine and
well, doesn't have 22 lines... ;)
--
pcarlini at suse dot de changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32408
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/32408] Template Parsing Error
2007-06-19 20:22 [Bug c++/32408] New: Template Parsing Error chsalvia at gmail dot com
2007-06-19 21:22 ` [Bug c++/32408] " schwab at suse dot de
2007-06-19 22:04 ` pcarlini at suse dot de
@ 2007-06-19 23:08 ` chsalvia at gmail dot com
2007-06-19 23:10 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: chsalvia at gmail dot com @ 2007-06-19 23:08 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from chsalvia at gmail dot com 2007-06-19 23:08 -------
Sorry. It seems this is actually a namespace conflict issue. If you add
include the iostream header file and add "using namespace std" the code will
not compile, due to a conflict with std::count.
#include <iostream>
using namespace std;
template <class T>
struct templated_struct
{
int count;
};
template <class T>
int template_func()
{
templated_struct<T> s;
if (s.count < 0) return 0;
return 0;
}
int main()
{
template_func<int> ();
return 0;
}
Now I'm not completely sure if this should be considered a bug. However, since
count is clearly a member of templated_struct, there shouldn't be a namespace
conflict here. Also, if you replace '<' with '>' or '==', it compiles fine
with no namespace conflict, which means gcc seems to be confusing '<' with a
template argument.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32408
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/32408] Template Parsing Error
2007-06-19 20:22 [Bug c++/32408] New: Template Parsing Error chsalvia at gmail dot com
` (2 preceding siblings ...)
2007-06-19 23:08 ` chsalvia at gmail dot com
@ 2007-06-19 23:10 ` pinskia at gcc dot gnu dot org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2007-06-19 23:10 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pinskia at gcc dot gnu dot org 2007-06-19 23:10 -------
*** This bug has been marked as a duplicate of 10200 ***
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32408
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2007-06-19 23:10 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-06-19 20:22 [Bug c++/32408] New: Template Parsing Error chsalvia at gmail dot com
2007-06-19 21:22 ` [Bug c++/32408] " schwab at suse dot de
2007-06-19 22:04 ` pcarlini at suse dot de
2007-06-19 23:08 ` chsalvia at gmail dot com
2007-06-19 23:10 ` pinskia at gcc dot gnu dot org
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