A Complete ENUM++ (from Besser's CUJ article) Example

[Randy]

Hi,

Can anyone point me to a complete, compilable example
of Besser's ENUM++ mechanism? I downloaded it from
CUJ and gave it a try but got errors just trying to compile
the header enum.h.

--Randy Yates

[Randy]

PS: Here's what I get. This is using gcc under fc3.

--RY
#include "enum.h"
int main(int argc, char **argv)
{
return 0;
}

cd /home/yates/modetest/host/app/modetest/
make -f enumpp.mak TARGET=native PLATFORM=linux
DSPROOT_DIR=/home/yates/modetest/ ATSIGN=
enumpp.mak:101: no file name for `include'
Building Component (enumpp) for Application enumpp
In file included from
/home/yates/modetest/host/app/modetest/enum.h:202,
from
/home/yates/modetest/host/app/modetest/enumpp.cpp:1:
/home/yates/modetest/host/app/modetest/StreamUDT.h: In function
`std::basic_ost ream<_CharT, _Traits>&
KEA::stream_ins erter(std::basi c_ostream<_Char T, _Traits>&, const
UDT&)':
/home/yates/modetest/host/app/modetest/StreamUDT.h:96: error: expected
`;' before "prepost"
/home/yates/modetest/host/app/modetest/StreamUDT.h:97: error: `prepost'
undeclared (first use this function)
/home/yates/modetest/host/app/modetest/StreamUDT.h:97: error: (Each
undeclared identifier is reported only once for each function it
appears in.)
/home/yates/modetest/host/app/modetest/StreamUDT.h: In function
`std::basic_ist ream<_CharT, _Traits>&
KEA::stream_ext ractor(std::bas ic_istream<_Cha rT, _Traits>&, UDT&)':
/home/yates/modetest/host/app/modetest/StreamUDT.h:151 : error: expected
`;' before "prepost"
/home/yates/modetest/host/app/modetest/StreamUDT.h:152 : error:
`prepost' undeclared (first use this function)
In file included from
/home/yates/modetest/host/app/modetest/enumpp.cpp:1:
/home/yates/modetest/host/app/modetest/enum.h: At global scope:
/home/yates/modetest/host/app/modetest/enum.h:257: error: ISO C++
forbids declaration of `value_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:257: error:
`::value_type' is not a valid declarator
/home/yates/modetest/host/app/modetest/enum.h:257: error: expected `;'
before "value_type "
/home/yates/modetest/host/app/modetest/enum.h:264: error: ISO C++
forbids declaration of `result_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:264: error: expected `;'
before "operator"
/home/yates/modetest/host/app/modetest/enum.h:334: error: expected `;'
before '}' token
/home/yates/modetest/host/app/modetest/enum.h:338: error: ISO C++
forbids declaration of `result_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:338: error: expected `;'
before "operator"
/home/yates/modetest/host/app/modetest/enum.h:344: error: expected `;'
before '}' token
/home/yates/modetest/host/app/modetest/enum.h:387: error: ISO C++
forbids declaration of `size_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:387: error: `::size_type'
is not a valid declarator
/home/yates/modetest/host/app/modetest/enum.h:387: error: expected `;'
before "max_length "
/home/yates/modetest/host/app/modetest/enum.h:393: error: expected `;'
before "inline"
/home/yates/modetest/host/app/modetest/enum.h: In member function
`std::_Ios_Iost ate KEA::_EnumSuper <_enumType, EnumSub,
N>::get_stream( std::basic_istr eam<_CharT2, _Traits2>&)':
/home/yates/modetest/host/app/modetest/enum.h:761: error: expected
primary-expression before "const"
/home/yates/modetest/host/app/modetest/enum.h:761: error: expected `;'
before "const"
/home/yates/modetest/host/app/modetest/enum.h:768: error:
`start_position ' undeclared (first use this function)
/home/yates/modetest/host/app/modetest/enum.h: At global scope:
/home/yates/modetest/host/app/modetest/enum.h:789: error: expected
constructor, destructor, or type conversion before "_EnumSuper "
/home/yates/modetest/host/app/modetest/enum.h:789: error: expected `;'
before "_EnumSuper "
/home/yates/modetest/host/app/modetest/enum.h:805: error: expected
init-declarator before '&' token
/home/yates/modetest/host/app/modetest/enum.h:805: error: expected `;'
before '&' token
make: *** [/home/yates/modetest/host/app/modetest/nativelinux/enumpp.o]
Error 1

Compilation exited abnormally with code 2 at Fri Jan 6 11:41:16

[Randy]

PSS: I've also downloaded and installed boost.

--RY

[Randy]

More specificaly, here's what I got in trying to compile.

By the way, I have already downloaded and installed
boost. This is for gcc under fc3.

--RY

#include "enum.h"
int main(int argc, char **argv)
{
return 0;
}

cd /home/yates/modetest/host/app/modetest/
make -f enumpp.mak TARGET=native PLATFORM=linux
DSPROOT_DIR=/home/yates/modetest/ ATSIGN=
enumpp.mak:101: no file name for `include'
Building Component (enumpp) for Application enumpp
In file included from
/home/yates/modetest/host/app/modetest/enum.h:202,
from
/home/yates/modetest/host/app/modetest/enumpp.cpp:1:
/home/yates/modetest/host/app/modetest/StreamUDT.h: In function
`std::basic_ost ream<_CharT, _Traits>&
KEA::stream_ins erter(std::basi c_ostream<_Char T, _Traits>&, const
UDT&)':
/home/yates/modetest/host/app/modetest/StreamUDT.h:96: error: expected
`;' before "prepost"
/home/yates/modetest/host/app/modetest/StreamUDT.h:97: error: `prepost'
undeclared (first use this function)
/home/yates/modetest/host/app/modetest/StreamUDT.h:97: error: (Each
undeclared identifier is reported only once for each function it
appears in.)
/home/yates/modetest/host/app/modetest/StreamUDT.h: In function
`std::basic_ist ream<_CharT, _Traits>&
KEA::stream_ext ractor(std::bas ic_istream<_Cha rT, _Traits>&, UDT&)':
/home/yates/modetest/host/app/modetest/StreamUDT.h:151 : error: expected
`;' before "prepost"
/home/yates/modetest/host/app/modetest/StreamUDT.h:152 : error:
`prepost' undeclared (first use this function)
In file included from
/home/yates/modetest/host/app/modetest/enumpp.cpp:1:
/home/yates/modetest/host/app/modetest/enum.h: At global scope:
/home/yates/modetest/host/app/modetest/enum.h:257: error: ISO C++
forbids declaration of `value_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:257: error:
`::value_type' is not a valid declarator
/home/yates/modetest/host/app/modetest/enum.h:257: error: expected `;'
before "value_type "
/home/yates/modetest/host/app/modetest/enum.h:264: error: ISO C++
forbids declaration of `result_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:264: error: expected `;'
before "operator"
/home/yates/modetest/host/app/modetest/enum.h:334: error: expected `;'
before '}' token
/home/yates/modetest/host/app/modetest/enum.h:338: error: ISO C++
forbids declaration of `result_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:338: error: expected `;'
before "operator"
/home/yates/modetest/host/app/modetest/enum.h:344: error: expected `;'
before '}' token
/home/yates/modetest/host/app/modetest/enum.h:387: error: ISO C++
forbids declaration of `size_type' with no type
/home/yates/modetest/host/app/modetest/enum.h:387: error: `::size_type'
is not a valid declarator
/home/yates/modetest/host/app/modetest/enum.h:387: error: expected `;'
before "max_length "
/home/yates/modetest/host/app/modetest/enum.h:393: error: expected `;'
before "inline"
/home/yates/modetest/host/app/modetest/enum.h: In member function
`std::_Ios_Iost ate KEA::_EnumSuper <_enumType, EnumSub,
N>::get_stream( std::basic_istr eam<_CharT2, _Traits2>&)':
/home/yates/modetest/host/app/modetest/enum.h:761: error: expected
primary-expression before "const"
/home/yates/modetest/host/app/modetest/enum.h:761: error: expected `;'
before "const"
/home/yates/modetest/host/app/modetest/enum.h:768: error:
`start_position ' undeclared (first use this function)
/home/yates/modetest/host/app/modetest/enum.h: At global scope:
/home/yates/modetest/host/app/modetest/enum.h:789: error: expected
constructor, destructor, or type conversion before "_EnumSuper "
/home/yates/modetest/host/app/modetest/enum.h:789: error: expected `;'
before "_EnumSuper "
/home/yates/modetest/host/app/modetest/enum.h:805: error: expected
init-declarator before '&' token
/home/yates/modetest/host/app/modetest/enum.h:805: error: expected `;'
before '&' token
make: *** [/home/yates/modetest/host/app/modetest/nativelinux/enumpp.o]
Error 1

Compilation exited abnormally with code 2 at Fri Jan 6 11:41:16

[mlimber]

Randy wrote:

Hi,

Can anyone point me to a complete, compilable example
of Besser's ENUM++ mechanism? I downloaded it from
CUJ and gave it a try but got errors just trying to compile
the header enum.h.

--Randy Yates

Can you give me a link to the code you downloaded?

Cheers! --M

[mlimber]

Randy wrote:

Hi,

Can anyone point me to a complete, compilable example
of Besser's ENUM++ mechanism? I downloaded it from
CUJ and gave it a try but got errors just trying to compile
the header enum.h.

--Randy Yates

I found the code here:

ftp://ftp.cuj.com/pub/2003/cujjun2003.zip

The problem is that it appears Mr. Besser used an old (pre-C++03)
compiler. The problems can be fixed by adding the "typename" keyword at
various points (see
http://womble.decadentplace.org.uk/c...disambiguation)
and adding a few typedefs to obviate the type of problem discussed in
this FAQ:

http://www.parashift.com/c++-faq-lit...html#faq-35.18

For each of the two headers enum.h and StreamUDT.h, search for
"StringType ::" and add "typename " before it like this:

typedef typename StringType::val ue_type value_type;

Do likewise for other types that are nested within template classes,
e.g.:

const typename std::basic_istr eam<charT, Traits>::pos_ty pe
start_position= is.tellg();

and

typename _EnumSuper<_enu mType, EnumSub, N>::StringType

Where a struct/class inherits from std::unary_func tion or
std::binary_fun ction, add some typedefs in accord with the
aforementioned FAQ, e.g.:

struct Format: public std::unary_func tion<const char [], StringType>
{
typedef typename std::unary_func tion<const char [],
StringType>::re sult_type result_type;
typedef typename std::unary_func tion<const char [],
StringType>::ar gument_type argument_type;
// ...
};

and

struct StringLengthGre ater
: public std::binary_fun ction<const StringType*, const StringType*,
bool>
{
typedef typename std::binary_fun ction<const char [],
StringType>::re sult_type result_type;
typedef typename std::binary_fun ction<const char [],
StringType>::fi rst_argument_ty pe first_argument_ type;
typedef typename std::binary_fun ction<const char [],
StringType>::se cond_argument_t ype second_argument _type;
// ...
};

Then all the errors go away.

Cheers! --M

[Roland Pibinger]

On 6 Jan 2006 11:25:41 -0800, "Randy" <ya***@ieee.org > wrote:

Can anyone point me to a complete, compilable example
of Besser's ENUM++ mechanism? I downloaded it from
CUJ and gave it a try but got errors just trying to compile
the header enum.h.

IMO, an "enum enhancement" that claims to be "easy to use" but "relies
on having the Boost preprocessor library [1] installed" isn't worth
the trouble.
It's also a good example of why CUJ has been 'discontinued'.

Best wishes,
Roland Pibinger

[Randy]

Hi M,

I still need some hand-holding as this is still not working
and it's beyond my C++ ability to find out why.

I made the changes you directed (I think) and am able
to compile error- and warning-free. The files are available
at

www.digitalsignallabs.com/enumpp.cpp
www.digitalsignallabs.com/enum.h
www.digitalsignallabs.com/StreamUDT.h

If, however, I add an enumeration declaration as Besser
shows in his article:

#include "enum.h"

int main(int argc, char **argv)
{
ENUM3(IdiotResp onse, Yup, Nope, IDunno);

return 0;
}
I get errors:
g++ -c `cyg2dos /home/yates/modetest/host/app/modetest/enumpp.cpp`
-O3 -Wall -pthread -g -I /home/yates/modetest/host/inc/ -I
/home/yates/modetest/dsp/inc/ -DTARGET_NATIVE -DPLATFORM_LINUX -o
/home/yates/modetest/host/app/modetest/nativelinux/enumpp.o
/home/yates/modetest/host/app/modetest/enumpp.cpp:5:1: macro
"ENUM_GLOBAL_VA LUES" passed 4 arguments, but takes just 2
/home/yates/modetest/host/app/modetest/enumpp.cpp: In function `int
main(int, char**)':
/home/yates/modetest/host/app/modetest/enumpp.cpp:5: error:
`ENUM_GLOBAL_VA LUES' undeclared (first use this function)
/home/yates/modetest/host/app/modetest/enumpp.cpp:5: error: (Each
undeclared identifier is reported only once for each function it
appears in.)
/home/yates/modetest/host/app/modetest/enumpp.cpp:5: error: expected
`;' before "class"
Please help some more!

--Randy

[mlimber]

Randy wrote:

Hi M,

I still need some hand-holding as this is still not working
and it's beyond my C++ ability to find out why.

I made the changes you directed (I think) and am able
to compile error- and warning-free. The files are available
at

www.digitalsignallabs.com/enumpp.cpp
www.digitalsignallabs.com/enum.h
www.digitalsignallabs.com/StreamUDT.h
Those look good.
If, however, I add an enumeration declaration as Besser
shows in his article:

#include "enum.h"

int main(int argc, char **argv)
{
ENUM3(IdiotResp onse, Yup, Nope, IDunno);

return 0;
}
I get errors:
g++ -c `cyg2dos /home/yates/modetest/host/app/modetest/enumpp.cpp`
-O3 -Wall -pthread -g -I /home/yates/modetest/host/inc/ -I
/home/yates/modetest/dsp/inc/ -DTARGET_NATIVE -DPLATFORM_LINUX -o
/home/yates/modetest/host/app/modetest/nativelinux/enumpp.o
/home/yates/modetest/host/app/modetest/enumpp.cpp:5:1: macro
"ENUM_GLOBAL_VA LUES" passed 4 arguments, but takes just 2
/home/yates/modetest/host/app/modetest/enumpp.cpp: In function `int
main(int, char**)':
/home/yates/modetest/host/app/modetest/enumpp.cpp:5: error:
`ENUM_GLOBAL_VA LUES' undeclared (first use this function)
/home/yates/modetest/host/app/modetest/enumpp.cpp:5: error: (Each
undeclared identifier is reported only once for each function it
appears in.)
/home/yates/modetest/host/app/modetest/enumpp.cpp:5: error: expected
`;' before "class"
Please help some more!

--Randy

You might need to take the ENUM3 declaration outside of the function
body to give it external linkage. If I do that, the example works fine
with VC++6, which is the compiler the author used.

I did a somewhat cursory look at things on g++ 3.4.4, on which your
code doesn't work for me either, but I didn't see anything obviously
wrong. To reduce the noise, you can see the preprocessor error alone by
using the -E option, which yields:

macro "ENUM_GLOBAL_VA LUES" passed 4 arguments, but takes just 2

The ultimate problem seems to be with the use of this macro:

#define ENUM_LIST(size, tuple) \
BOOST_PP_LIST_E NUM(BOOST_PP_TU PLE_TO_LIST(siz e, tuple))

I'm no Boost PP expert, and so I'll have to recommend that you take
this to the Boost User list at
http://lists.boost.org/mailman/listinfo.cgi/boost-users or perhaps to a
GNU forum. I didn't see anything about a compiler incompatibility on
Boost's website (indeed,
http://engineering.meta-comm.com/boo...processor.html
seems to indicate that it should be fully functional), so I'd talk to
the folks in the know.

I also briefly tried tracking down the author of the article to no
avail. You might be able to find him out there somewhere, and ask him
for help directly.

Sorry I can't be more help.

Cheers! --M

[Paul Mensonides]

mlimber wrote:

using the -E option, which yields:

macro "ENUM_GLOBAL_VA LUES" passed 4 arguments, but takes just 2

The ultimate problem seems to be with the use of this macro:

#define ENUM_LIST(size, tuple) \
BOOST_PP_LIST_E NUM(BOOST_PP_TU PLE_TO_LIST(siz e, tuple))

I'm no Boost PP expert, and so I'll have to recommend that you take
this to the Boost User list at
http://lists.boost.org/mailman/listinfo.cgi/boost-users or perhaps to
a
GNU forum. I didn't see anything about a compiler incompatibility on
Boost's website (indeed,
http://engineering.meta-comm.com/boo...processor.html
seems to indicate that it should be fully functional), so I'd talk to
the folks in the know.

I also briefly tried tracking down the author of the article to no
avail. You might be able to find him out there somewhere, and ask him
for help directly.

Sorry I can't be more help.

The quick dirty fix for your preprocessing error... First, include
<boost/preprocessor/tuple/rem.hpp> with the rest of the Boost.Preproces sor
includes. Then alter line 830 (in the definition of BEGIN_ENUM) from...

ENUM_GLOBAL_VAL UES(type, value_list) \

....to...

ENUM_GLOBAL_VAL UES(type, BOOST_PP_TUPLE_ REM(N)(value_li st)) \

Regards,
Paul Mensonides