[Bug c++/29266] Rule that binding rvalue to a refernce need a copy ctor don't work
--- Comment #6 from yuanfei8077 at gmail dot com 2006-10-02 14:19 --- Subject: Re: Rule that binding rvalue to a refernce need a copy ctor don't work Thank you Andrew, appreciate your help on this topic. -Kelvin On 1 Oct 2006 20:33:33 -, pinskia at gcc dot gnu dot org [EMAIL PROTECTED] wrote: --- Comment #5 from pinskia at gcc dot gnu dot org 2006-10-01 20:33 --- (In reply to comment #3) Plesae seee Comment #2 From Kelvin 2006-09-28 23:25 [reply]. In addition 2 questions I raised in the Commet2. I also have one more question about the rule bind an rvalue to a reference, we need to let copy ctor of the class be accessible., I found that this rule only effective when the reference is delcared as const , but if we remove keyword const, then no matching happen again. Because it will not be a copy constructor that can bind a rvalue to a reference at that point so this is still not a bug. -- pinskia at gcc dot gnu dot org changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29266 --- You are receiving this mail because: --- You reported the bug, or are watching the reporter. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29266
[Bug c++/29266] New: Rule that binding rvalue to a refernce need a copy ctor don't work
Hi,
I used to open a issue at http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29261 and
it's closed as no a bug. Also it says that to bind an rvalue to a reference,
we need to let copy ctor of the class be accessible. However, I found that
this is not the case when the invokcation is happen in intialization list.
See below reproduction code and error message.
Env:
=
G++ 4.1
No compile option is used
Source code:
==
using std::cout;
using std::endl;
class MemPool {
public:
MemPool(){};
protected:
MemPool(const MemPool mempool);
};
template class Type class MemAllocator{
public:
MemAllocator(MemPool pool):m_pool(pool){}
MemPool get_pool() const {
return m_pool;
}
templateclass OtherType
MemAllocatorType operator=(const MemAllocatorOtherType rhs){
m_pool = rhs.get_pool();
return *this;
}
MemAllocator operator=(const MemAllocator rhs){
m_pool = rhs.get_pool();
return *this;
}
MemAllocator(const MemAllocator other)
: m_pool(other.m_pool) {}
templateclass OtherType
MemAllocator(const MemAllocatorOtherType other)
: m_pool(other.get_pool()) {}
private:
MemAllocator();
// MemAllocator(const MemAllocator);
MemPool m_pool;
};
template class _AllocType class tdat_hash_map {
public:
typedef _AllocType _Alloc;
static void func(const _Alloc) {};
_Alloc malloc;
private:
tdat_hash_map();
};
class CacheManager {
public:
typedef tdat_hash_mapMemAllocatorint Map;
Map caches;
MemPool pool;
CacheManager():caches(MemAllocatorint(pool)){};
};
Error message:
==
main.cpp: In constructor CacheManager::CacheManager()
main.cpp:56: error: no matching function for call to
tdat_hash_mapMemAllocatorint
::tdat_hash_map(MemAllocatorint)main.cpp:49: note: candidates are:
tdat_hash_map_AllocType::tdat_hash_map() [with _AllocType =
MemAllocatorint]
main.cpp:42: note: tdat_hash_mapMemAllocatorint
::tdat_hash_map(const tdat_hash_mapMemAllocatorint )
--
Summary: Rule that binding rvalue to a refernce need a copy ctor
don't work
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: yuanfei8077 at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29266
[Bug c++/29266] Rule that binding rvalue to a refernce need a copy ctor don't work
--- Comment #2 from yuanfei8077 at gmail dot com 2006-09-28 23:25 --- Subject: Re: Rule that binding rvalue to a refernce need a copy ctor don't work Hi Andrew, You are right, I am omitting the code, however, my question is: 1) t.cc:38: error: 'MemAllocatorType::MemAllocator() [with Type = int]' is private t.cc:49: error: within this context However, MemAllocator is only invoked by class data member cache's intialization list, and MemAllocator's copy constructor is already provided, so you mean I am forced to offer default constructor too to make it pass, right ? 2) There is no tdat_hash_map(_Alloc) in the sources. ::tdat_hash_map(MemAllocatorint)main.cpp:49: note: candidates are: tdat_hash_map_AllocType::tdat_hash_map() [with _AllocType = MemAllocatorint] main.cpp:42: note: tdat_hash_mapMemAllocatorint ::tdat_hash_map(const tdat_hash_mapMemAllocatorint ) But from the original error output, comiler have added a default tdat_hash_map in line 42, and its format is same as what you added to make no matching error disappear. Can you explain explain why the default can't work ? Thanks for your help! -Kelvin On 28 Sep 2006 13:39:16 -, pinskia at gcc dot gnu dot org [EMAIL PROTECTED] wrote: --- Comment #1 from pinskia at gcc dot gnu dot org 2006-09-28 13:39 --- There is no tdat_hash_map(_Alloc) in the sources. Adding one makes it get past that error and then we get: t.cc: In constructor 'tdat_hash_map_AllocType::tdat_hash_map(const _AllocType) [with _AllocType = MemAllocatorint]': t.cc:64: instantiated from here t.cc:38: error: 'MemAllocatorType::MemAllocator() [with Type = int]' is private t.cc:49: error: within this context So this is invalid still. -- pinskia at gcc dot gnu dot org changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution||INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29266 --- You are receiving this mail because: --- You reported the bug, or are watching the reporter. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29266
[Bug c++/29266] Rule that binding rvalue to a refernce need a copy ctor don't work
--- Comment #3 from yuanfei8077 at gmail dot com 2006-09-29 03:02 ---
Plesae seee Comment #2 From Kelvin 2006-09-28 23:25 [reply].
In addition 2 questions I raised in the Commet2. I also have one more question
about the rule bind an rvalue to a reference,
we need to let copy ctor of the class be accessible., I found that this rule
only effective when the reference is delcared as const , but if we remove
keyword const, then no matching happen again.
using std::cout;
using std::endl;
class MemPool {
public:
MemPool(){};
protected:
MemPool(const MemPool mempool);
};
template class Type class MemAllocator{
public:
MemAllocator(MemPool pool):m_pool(pool){}
MemPool get_pool() const {
return m_pool;
}
templateclass OtherType
MemAllocatorType operator=(const MemAllocatorOtherType rhs){
m_pool = rhs.get_pool();
return *this;
}
MemAllocator operator=(const MemAllocator rhs){
m_pool = rhs.get_pool();
return *this;
}
MemAllocator(const MemAllocator other)
: m_pool(other.m_pool) {}
templateclass OtherType
MemAllocator(const MemAllocatorOtherType other)
: m_pool(other.get_pool()) {}
private:
MemAllocator();
// MemAllocator(const MemAllocator);
MemPool m_pool;
};
template class _AllocType class tdat_hash_map {
public:
typedef _AllocType _Alloc;
static void func(const _Alloc) {};
tdat_hash_map(const _Alloc); // there will be error if const is removed
_Alloc malloc;
private:
tdat_hash_map();
};
class CacheManager {
public:
typedef tdat_hash_mapMemAllocatorint Map;
Map caches;
MemPool pool;
CacheManager():caches(MemAllocatorint(pool)){};
};
--
yuanfei8077 at gmail dot com changed:
What|Removed |Added
Status|RESOLVED|UNCONFIRMED
Resolution|INVALID |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29266
[Bug c++/29252] New: Strange No matching function for call compilation error with G++ 4.1
Hi there, I am porting some code to SUSE 10, with G++ 4.1. And hit an strange no matching function call compilation error. I am confused because the calling function and candidate are nearly 100% same. I wonder if this is a known G++ limitation or issue ? Because the same program got compiled with VC8. Below is the compilation environment info and compilation error. env info = g++ (GCC) 4.1.0 (SUSE Linux 10), note that this issue can also be found at G++ 3.2(UL1.0) No compile option is added Compilation error == ./Cache/CacheManager.h:424: error: no matching function for call to tdat_hash_mapstd::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t , Elementunsigned int, SqlObjectDefn, std::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t *, MemAllocatorstd::pairstd::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t , Elementunsigned int, SqlObjectDefn, std::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t * ::tdat_hash_map1(MemAllocatorstd::pairstd::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t , Elementunsigned int, SqlObjectDefn, std::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t * , int) ./Common/TdatHashMap.h:250: note: candidates are: static void tdat_hash_map_Key, _Tp, _AllocType::tdat_hash_map1(_AllocType, int) [with _Key = std::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t , _Tp = Elementunsigned int, SqlObjectDefn, std::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t *, _AllocType = MemAllocatorstd::pairstd::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t , Elementunsigned int, SqlObjectDefn, std::basic_stringwchar_t, std::char_traitswchar_t, std::allocatorwchar_t * ] Any comments/suggestions are higly appreciated. Thanks, -Kelvin -- Summary: Strange No matching function for call compilation error with G++ 4.1 Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: critical Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: yuanfei8077 at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29252
[Bug c++/29252] Strange No matching function for call compilation error with G++ 4.1
--- Comment #2 from yuanfei8077 at gmail dot com 2006-09-28 01:50 ---
Hi,
For your convinence, the following is the reproduction code.
Many Thanks,
-Kelvin
Compilation error
=
no matching function for call to tdat_hash_mapMemAllocatorint
::func(MemAllocatorint)
main.cpp:6: note: candidates are: static void
tdat_hash_map_AllocType::func(_AllocType)
[with _AllocType = MemAllocatorint]
Repro code
===
template class Type class MemAllocator{};
template class _AllocType class tdat_hash_map {
public:
typedef _AllocType _Alloc;
static void func(_Alloc) {};
};
int main()
{
typedef tdat_hash_mapMemAllocatorint Map;
Map::func((MemAllocatorint) (MemAllocatorint()));
return 0;
}
--
yuanfei8077 at gmail dot com changed:
What|Removed |Added
Status|WAITING |UNCONFIRMED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29252
[Bug c++/29261] New: Hiding constructior is required while no direct invocation to it with G++ 4
Hi there,
I found that the compiling the following code will fail with g++ 4.1
while cmopile succeed with VC8. I suspect this is a g++ error.
env info
=
g++ (GCC) 4.1.0 (SLES10)
No compile option is added
Compilation error
=
main.cpp: In copy constructor MemAllocatorint::MemAllocator(const
MemAllocatorint)
main.cpp:5: error: MemPool::MemPool(const MemPool) is protected
main.cpp:8: error: within this context
main.cpp: In function int main()
main.cpp:32: note: synthesized method
MemAllocatorint::MemAllocator(const MemAllocatorint) first
required here
Repro code
===
class MemPool {
public:
MemPool(){};
protected:
MemPool(const MemPool mempool);
};
template class Type class MemAllocator{
public:
MemPool m_pool;
MemAllocator(){}
MemPool get_pool() const {
return m_pool;
}
templateclass OtherType
MemAllocatorType operator=(const MemAllocatorOtherType rhs){
m_pool = rhs.get_pool;
return *this;
}
};
template class _AllocType class tdat_hash_map {
public:
typedef _AllocType _Alloc;
static void func(_Alloc) {};
};
int main()
{
typedef tdat_hash_mapMemAllocatorint Map;
MemAllocatorint abc = MemAllocatorint();
return 0;
}
Thanks,
-Kelvin
--
Summary: Hiding constructior is required while no direct
invocation to it with G++ 4
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: yuanfei8077 at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29261
