compilation error: cannot be overloaded

[prakash.mirji]

Hello,

I am trying to compile C++ code which uses rogue wave 9.0 classes on
RHEL
4.0. I use gnu g++ compiler to compile the code.
Compiler is not able to match the right type of parameters to overload
the
methods of RW classes.
Below are the two methods among others in the rw/ep_scntn.h header
file
where compiler says cannot be overloaded.

RWBoolean contains(RWBool ean(*fn)(const_ value,void*),vo id* x) const;
RWBoolean contains(RWBool ean(*fn)(value_ type,void*),voi d* x) const
{ return base_type::cont ains(fn,x); }

Compiler is treating the first parameter in above methods as same.

When I issue a make command from one of our c++ module, I get below
error

/usr/bin/g++ -g -fpic -D_POSIX_SOURCE -DTRACING -D__EXTENSIONS__ -
D__RWCOMPILER_H __
-D_REENTRANT -D_RWCONFIG=8s -D_RWCONFIG_12d -D_RWSTDDEBUG -
DRWDEBUG -c
TrackListMap.C -I../inc -I/psalms/common/inc -I/psalms/common/Map/inc -
I/psalms/common/Scan/inc
-I/opt/ossasn1/linux-glibc2.2.trial/8.2.0-betaA/include -I/psalms/
common/ASNFw2/sep/inc
-I/psalms/common/DbFw/inc -I/psalms/common/DbFwMgr/inc -I/psalms/
common/Time/inc
-I/psalms/common/LoggingFw/inc -I/psalms/common/ExcepFw/inc -I/psalms/
common/ConfigFw/inc
-I/psalms/common/SdtArm/inc -I/opt/RogueWave/SourcePro -o
TrackListMap.o

In file included from ../inc/TrackListMap.h: 18,
from TrackListMap.C: 15:
/opt/RogueWave/SourcePro/rw/ep_scntn.h: In instantiation of
`RW_PCntnr<std: :vector<const RWCString*, std::allocator< const
RWCString*,
RWTPtrOrderedVe ctor<const RWCString, std::allocator< const RWCString*>

>,

const RWCString>':
/opt/RogueWave/SourcePro/rw/ep_seq.h:50: instantiated from
`RW_PSeq<std::v ector<const RWCString*, std::allocator< const
RWCString*,
RWTPtrOrderedVe ctor<const RWCString, std::allocator< const RWCString*>

>,

const RWCString>'
/opt/RogueWave/SourcePro/rw/tpordvec.h:65: instantiated from
`RWTPtrOrderedV ector<const RWCString, std::allocator< const RWCString*>

>'

/psalms/common/Map/inc/MapFile.h:27: instantiated from here
/opt/RogueWave/SourcePro/rw/ep_scntn.h:92: error: `RWBoolean
RW_PCntnr<StdCo ll, RWColl, T>::contains(RW Boolean (*)(typename
StdColl::value_ type, void*), void*) const [with StdColl =
std::vector<con st
RWCString*, std::allocator< const RWCString*, RWColl =
RWTPtrOrderedVe ctor<const RWCString, std::allocator< const RWCString*>

>, T =

const RWCString]' and `RWBoolean RW_PCntnr<StdCo ll, RWColl,
T>::contains(RW Boolean (*)(const T*, void*), void*) const [with
StdColl =
std::vector<con st RWCString*, std::allocator< const RWCString*,
RWColl =
RWTPtrOrderedVe ctor<const RWCString, std::allocator< const RWCString*>

>, T =

const RWCString]' cannot be overloaded
/opt/RogueWave/SourcePro/rw/ep_scntn.cc:96: error: `typename
RW_PCntnr<StdCo ll, RWColl, T>::value_type RW_PCntnr<StdCo ll, RWColl,
T>::find(RWBool ean (*)(typename StdColl::value_ type, void*), void*)
const
[with StdColl = std::vector<con st RWCString*, std::allocator< const
RWCString*, RWColl = RWTPtrOrderedVe ctor<const RWCString,
std::allocator< const RWCString*, T = const RWCString]' and
`typename
RW_PCntnr<StdCo ll, RWColl, T>::value_type RW_PCntnr<StdCo ll, RWColl,
T>::find(RWBool ean (*)(const T*, void*), void*) const [with StdColl =
std::vector<con st RWCString*, std::allocator< const RWCString*,
RWColl =
RWTPtrOrderedVe ctor<const RWCString, std::allocator< const RWCString*>

>, T =

const RWCString]' cannot be overloaded
............... ...........
............... ............
any idea why we get above error. and how to fix the same.

Thanks & Regards,
Prakash

[Ivan Vecerina]

<pr***********@ gmail.comwrote in message
news:11******** *************@l 77g2000hsb.goog legroups.com...
: I am trying to compile C++ code which uses rogue wave 9.0 classes on
: RHEL
: 4.0. I use gnu g++ compiler to compile the code.
: Compiler is not able to match the right type of parameters to overload
: the
: methods of RW classes.
: Below are the two methods among others in the rw/ep_scntn.h header
: file
: where compiler says cannot be overloaded.
:
: RWBoolean contains(RWBool ean(*fn)(const_ value,void*),vo id* x) const;
: RWBoolean contains(RWBool ean(*fn)(value_ type,void*),voi d* x) const
: { return base_type::cont ains(fn,x); }
:
: Compiler is treating the first parameter in above methods as same.
Hmm, just making a best guess from this short code fragment:
Unless const_value and value_type are reference-types, the above
overload is indeed illegal.
The const-ness of a by-value parameter does not affect the
signature of a function. That is, the two following declarations
are not overloads, but refer to the exact same function:
void f( int a );
void f( int const a );

: any idea why we get above error. and how to fix the same.

Concretely, the following would be valid:
RWBoolean contains(RWBool ean(*fn)(const_ value&,void*),v oid* x) const;
RWBoolean contains(RWBool ean(*fn)(value_ type&,void*),vo id* x) const

[ Assuming typedef T value_type; typedef T const const_value; ]

If you need further guidance, please try to extract a
self-contained code sample that reproduces the error,
or ask on a forum dedicated to the Rogue Wave libraries...

I hope this helps,
Ivan
--
http://ivan.vecerina.com/contact/?subject=NG_POST <- email contact form
Brainbench MVP for C++ <http://www.brainbench.com