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xprime@earthlink.net
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 Posted: Wed Dec 15, 2004 1:37 am Post subject: Compile error with template template parameter: is g++ at f |
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Hello C++ coders,
I am trying to compile some code which uses template template
parameters. The code is shown below for reference. This code will
compile with icc, but not with g++. The error message is also
reproduced below.
Is this legal c++ code? It seems that g++ is inappropriately
considering Folderol::operator<<() as a candidate for the function call
at line 23. I say inappropriately because the parameter types are
(intentionally) not even the same between the call and the prototype.
I'm pretty sure the template is at fault, because if I remove it the
program compiles, and with a suitable main function, runs.
This is a distillation of my actual code. It is about as minimal as I
could get it and still produce the error. I googled for the error
message and otherwise attempted to grok this on my own, but I got
nuthin'. Any help would be appreciated.
1
2 #include
3 #include <iostream>
4 #include <sstream>
5 #include <map>
6
7 namespace Folderol
8 {
9 template<template
10 int DEPTH,
11 class ValueType>
12 void operator<<(int &s, const MAP
13 {
14 }
15 }
16
17 namespace Folderol
18 {
19 void foo()
20 {
21 std::string k;
22 std::stringstream message;
23 message << k;
24 }
25 }
26
$ g++ Folderol.cpp
Folderol.cpp: In function `void Folderol::foo()':
Folderol.cpp:23: template argument 3 is invalid
$ g++ -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--host=i386-redhat-linux
Thread model: posix
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
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msalters
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| Posted: Wed Dec 15, 2004 1:02 pm Post subject: Re: Compile error with template template parameter: is g++ a |
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[email]xprime (AT) earthlink (DOT) net[/email] wrote:
| Quote: | Hello C++ coders,
I am trying to compile some code which uses template template
parameters. The code is shown below for reference. This code will
compile with icc, but not with g++. The error message is also
reproduced below.
Is this legal c++ code? It seems that g++ is inappropriately
considering Folderol::operator<<() as a candidate for the function
call
at line 23. I say inappropriately because the parameter types are
(intentionally) not even the same between the call and the prototype.
I'm pretty sure the template is at fault, because if I remove it the
program compiles, and with a suitable main function, runs.
|
I don't think it is the only error, but you have only one
operator<< declared in your file. You do include
which often but not always includes <ostream>. Your code relies
on an operator<< from
and repost the new code and error. Also, which g++ is it?
Regards,
Michiel Salters
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Mike Davis
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| Posted: Wed Dec 15, 2004 6:18 pm Post subject: Re: Compile error with template template parameter: is g++ a |
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| Quote: | So I'd suggest to add <ostream> and repost the new code and error.
|
Thanks for the suggestion. I included the indicated file and
recompiled. The result was the exact same error message.
| Quote: | Also, which g++ is it?
From the orginal post:
|
$ g++ -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--host=i386-redhat-linux
Thread model: posix
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
Thank you very much.
Mike Davis
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Mike Davis
Guest
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| Posted: Wed Dec 15, 2004 6:51 pm Post subject: Re: Compile error with template template parameter: is g++ a |
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| Quote: | So I'd suggest to add <ostream> and repost the new code and error.
|
Thanks for the suggestion. I included the indicated file and
recompiled. The result was the exact same error message.
| Quote: | Also, which g++ is it?
From the orginal post:
|
$ g++ -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--host=i386-redhat-linux
Thread model: posix
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
Thank you very much.
Mike Davis
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Ben Hutchings
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| Posted: Thu Dec 16, 2004 1:41 pm Post subject: Re: Compile error with template template parameter: is g++ |
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[email]xprime (AT) earthlink (DOT) net[/email] wrote:
| Quote: | Hello C++ coders,
I am trying to compile some code which uses template template
parameters. The code is shown below for reference. This code will
compile with icc, but not with g++. The error message is also
reproduced below.
snip
7 namespace Folderol
8 {
9 template<template
10 int DEPTH,
11 class ValueType
12 void operator<<(int &s, const MAP
13 {
14 }
15 }
16
17 namespace Folderol
18 {
19 void foo()
20 {
21 std::string k;
22 std::stringstream message;
23 message << k;
24 }
25 }
26
$ g++ Folderol.cpp
Folderol.cpp: In function `void Folderol::foo()':
Folderol.cpp:23: template argument 3 is invalid
|
This is a compiler bug. Specialisation failure is not an error
(SFINAE) and should simply eliminate your operator<< template from
consideration.
| Quote: | $ g++ -v
snip
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
|
Try upgrading to 3.4.
--
Ben Hutchings
If at first you don't succeed, you're doing about average.
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Ben Hutchings
Guest
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| Posted: Fri Dec 17, 2004 4:41 am Post subject: Re: Compile error with template template parameter: is g++ |
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I wrote:
| Quote: | xprime (AT) earthlink (DOT) net wrote:
snip
$ g++ Folderol.cpp
Folderol.cpp: In function `void Folderol::foo()':
Folderol.cpp:23: template argument 3 is invalid
This is a compiler bug. Specialisation failure is not an error
(SFINAE) and should simply eliminate your operator<< template from
consideration.
$ g++ -v
snip
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
Try upgrading to 3.4.
|
This seems to be broken in 3.4.3 still, though a similar bug was
fixed:
--
Ben Hutchings
This sentence contradicts itself - no actually it doesn't.
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Ben Hutchings
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| Posted: Fri Dec 17, 2004 3:09 pm Post subject: Re: Compile error with template template parameter: is g++ |
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I wrote:
| Quote: | I wrote:
[email]xprime (AT) earthlink (DOT) net[/email] wrote:
snip
$ g++ Folderol.cpp
Folderol.cpp: In function `void Folderol::foo()':
Folderol.cpp:23: template argument 3 is invalid
This is a compiler bug. Specialisation failure is not an error
(SFINAE) and should simply eliminate your operator<< template from
consideration.
$ g++ -v
snip
gcc version 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
Try upgrading to 3.4.
This seems to be broken in 3.4.3 still, though a similar bug was
fixed:
|
Sorry to have to post again, but the bug you found has been reported
as <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17344, fixed in the
development version, and should be gone in versions 3.4.4 and 4.0.0.
--
Ben Hutchings
73.46% of all statistics are made up.
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Mike Davis
Guest
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| Posted: Tue Dec 21, 2004 10:21 am Post subject: Re: Compile error with template template parameter: is g++ a |
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Thanks for the continuing followups. As soon as I get back to work
after the holidays, I'll test 3.4.4 and/or 4.0.0.
Regards,
Mike Davis
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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