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* [Bug c++/15469] New: Unable to compile valid code including transform() algorithm
@ 2004-05-16 22:07 relf at os2 dot ru
2004-05-16 22:11 ` [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter relf at os2 dot ru
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: relf at os2 dot ru @ 2004-05-16 22:07 UTC (permalink / raw)
To: gcc-bugs
While compiling the code below, gcc 3.3.3 reports the error:
bug2.cpp:21: error: no matching function for call to `transform(
std::_Rb_tree_iterator<std::pair<const int, int>, std::pair<const int,
int>&, std::pair<const int, int>*>, std::_Rb_tree_iterator<std::pair<const
int, int>, std::pair<const int, int>&, std::pair<const int, int>*>,
__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >,
<unknown type>)'
The code looks correct, not much different from the C++ Standard section 18.6.2
examples.
secondof() function by itself works fine - i've included a line into the code to
demonstrate that.
==============================
#include <iostream>
#include <map>
#include <vector>
#include <algorithm>
using namespace std;
template <class cl1, class cl2>
const cl2& secondof(const pair<cl1,cl2>& p) {
return p.second;
}
int main() {
map<int,int> M;
M[1] = 10;
M[4] = 50;
cout << "secondof() works as expected: " << secondof(*M.begin()) << endl;
vector<int> V(M.size());
transform(M.begin(),M.end(),V.begin(),secondof);
}
--
Summary: Unable to compile valid code including transform()
algorithm
Product: gcc
Version: 3.3.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: relf at os2 dot ru
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15469
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter
2004-05-16 22:07 [Bug c++/15469] New: Unable to compile valid code including transform() algorithm relf at os2 dot ru
@ 2004-05-16 22:11 ` relf at os2 dot ru
2004-05-16 22:24 ` pinskia at gcc dot gnu dot org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: relf at os2 dot ru @ 2004-05-16 22:11 UTC (permalink / raw)
To: gcc-bugs
--
What |Removed |Added
----------------------------------------------------------------------------
Summary|Unable to compile valid code|Unable to compile valid code
|including transform() |including transform()
|algorithm |algorithm: <unknown type> is
| |reported for the forth
| |parameter
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15469
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter
2004-05-16 22:07 [Bug c++/15469] New: Unable to compile valid code including transform() algorithm relf at os2 dot ru
2004-05-16 22:11 ` [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter relf at os2 dot ru
@ 2004-05-16 22:24 ` pinskia at gcc dot gnu dot org
2004-05-17 19:13 ` bangerth at dealii dot org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-05-16 22:24 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-15 21:27 -------
This is a dup of bug 5458.
*** This bug has been marked as a duplicate of 5458 ***
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |DUPLICATE
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15469
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter
2004-05-16 22:07 [Bug c++/15469] New: Unable to compile valid code including transform() algorithm relf at os2 dot ru
2004-05-16 22:11 ` [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter relf at os2 dot ru
2004-05-16 22:24 ` pinskia at gcc dot gnu dot org
@ 2004-05-17 19:13 ` bangerth at dealii dot org
2004-05-17 19:13 ` bangerth at dealii dot org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: bangerth at dealii dot org @ 2004-05-17 19:13 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bangerth at dealii dot org 2004-05-17 02:40 -------
As mentioned, this is invalid.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15469
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter
2004-05-16 22:07 [Bug c++/15469] New: Unable to compile valid code including transform() algorithm relf at os2 dot ru
` (2 preceding siblings ...)
2004-05-17 19:13 ` bangerth at dealii dot org
@ 2004-05-17 19:13 ` bangerth at dealii dot org
2004-05-17 19:18 ` relf at os2 dot ru
2004-05-17 19:41 ` gdr at integrable-solutions dot net
5 siblings, 0 replies; 7+ messages in thread
From: bangerth at dealii dot org @ 2004-05-17 19:13 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From bangerth at dealii dot org 2004-05-17 02:39 -------
No, the bug is actually something completely different. When you
refer to 'secondof' in the call to transform, you reference a
template without giving the compiler the chance to actually
deduce the template arguments. You need to write this as
follows:
transform(M.begin(),M.end(),V.begin(),secondof<int,int>);
Wolfgang
--
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|DUPLICATE |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15469
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter
2004-05-16 22:07 [Bug c++/15469] New: Unable to compile valid code including transform() algorithm relf at os2 dot ru
` (3 preceding siblings ...)
2004-05-17 19:13 ` bangerth at dealii dot org
@ 2004-05-17 19:18 ` relf at os2 dot ru
2004-05-17 19:41 ` gdr at integrable-solutions dot net
5 siblings, 0 replies; 7+ messages in thread
From: relf at os2 dot ru @ 2004-05-17 19:18 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From relf at os2 dot ru 2004-05-17 04:26 -------
Wolfgang, could you please explain the difference with the following example
from B.Stroustrup "The C++ Programming Language" 3rd edition, section 18.6.2:
template<class T> T* delete_ptr(T* p) { delete p; return 0; }
void purge(deque<Shape*>& s)
{
transform(s.begin(),s.end(),s.begin(),delete_ptr);
// ...
}
Note that here we pass just `delete_ptr' but not `delete_ptr<Shape>' as the
forth parameter. Why this code does not reqire explicit template class
specification while my code (that is not much different, in fact) does?
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |bangerth at dealii dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15469
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter
2004-05-16 22:07 [Bug c++/15469] New: Unable to compile valid code including transform() algorithm relf at os2 dot ru
` (4 preceding siblings ...)
2004-05-17 19:18 ` relf at os2 dot ru
@ 2004-05-17 19:41 ` gdr at integrable-solutions dot net
5 siblings, 0 replies; 7+ messages in thread
From: gdr at integrable-solutions dot net @ 2004-05-17 19:41 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From gdr at integrable-solutions dot net 2004-05-17 07:27 -------
Subject: Re: Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter
"relf at os2 dot ru" <gcc-bugzilla@gcc.gnu.org> writes:
| Wolfgang, could you please explain the difference with the following example
| from B.Stroustrup "The C++ Programming Language" 3rd edition, section 18.6.2:
|
| template<class T> T* delete_ptr(T* p) { delete p; return 0; }
| void purge(deque<Shape*>& s)
| {
| transform(s.begin(),s.end(),s.begin(),delete_ptr);
| // ...
| }
Wolfgang is right. We don't have types for address of function
templates or overload functions (not that a function template is
treated ini many cases as an infinite overload set).
| Note that here we pass just `delete_ptr' but not `delete_ptr<Shape>' as the
| forth parameter. Why this code does not reqire explicit template class
| specification while my code (that is not much different, in fact) does?
In my copy of TC++PL3, special edition, the code reads:
struct Delete_ptr { // use function object to get inlining
template<class T> T* operator()(T* p) { delete p; return 0; }
};
void purge(deque<Shape*>& s)
{
transform(s.begin(), s.end(), s.begin(), Delete_ptr());
}
-- Gaby
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15469
^ permalink raw reply [flat|nested] 7+ messages in thread
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2004-05-16 22:07 [Bug c++/15469] New: Unable to compile valid code including transform() algorithm relf at os2 dot ru
2004-05-16 22:11 ` [Bug c++/15469] Unable to compile valid code including transform() algorithm: <unknown type> is reported for the forth parameter relf at os2 dot ru
2004-05-16 22:24 ` pinskia at gcc dot gnu dot org
2004-05-17 19:13 ` bangerth at dealii dot org
2004-05-17 19:13 ` bangerth at dealii dot org
2004-05-17 19:18 ` relf at os2 dot ru
2004-05-17 19:41 ` gdr at integrable-solutions dot net
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