user allocator portability

["Xiaowen (Jason) Liu" <jasonliu at cs dot dartmouth dot edu>]

Hi.

I've been trying to write my owner memory allocator for shared memory 
multiprocessors. It seemed straightforward for STL, until I try to make 
it portable among different versions of gcc on different platforms.

I have a memory allocator called MyAlloc, defined in such a way that all 
allocators should be. I'm using 'map' and 'set'. In order to make a 
consistent view of memory, I need to make 'string' to use it as well. So 
I defined them in the following way:

typedef
basic_string<char,string_char_traits<char>,MyAlloc<char> >
__string;

typedef
map<__string,void*,less<__string>,MyAlloc<__string> >
__map_string_pvoid;

It certainly worked fine on my laptop. (I attached the information of 
the gcc installed on my laptop). However, I run into trouble when 
compiling it on the Solaris machine and on Mac OS X darwin (a BSD 
variant). They gave me the following error message:

`string_char_traits' was not declared in this scope
parse error before `>' token
`__string' was not declared in this scope
`less' was not declared in this scope
`__string' was not declared in this scope
ISO C++ forbids declaration of `map' with no type
template-id `map<<expression error>,
   void*, <expression error> >' used as a declarator
`__string' was not declared in this scope

Obviously, the compiler cannot find string_char_traits and less. 
Changing string_char_traits to char_traits doesn't help. I'm just 
wondering if I'm hitting somewhere where stdc++ is not portable at all. 
Or, is char_traits not supposed to be used by regular users? Then how am 
I suppose to have a portable allocator? I'm developing software that 
portability is the most important factor.

Thanks for any help.

--
Xiaowen (Jason) Liu          (jasonliu@cs.dartmouth.edu)
---------------------------------------------------------------
Computer Science Department  ISTS, Cybersecurity Research Group
Dartmouth College            Dartmouth College
6211 Sudikoff Laboratory     45 Lyme Road, Suite 201
Hanover, NH 03755            Hanover, NH 03755

Telephone: 603-646-0676      Fax: 603-646-0660
WWW Home Page: http://www.cs.dartmouth.edu/~jasonliu/
---------------------------------------------------------------



Here is info of the gcc I'm using on my laptop:

% cpp -v -x c++ /dev/null /dev/null
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-97)
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c++ -D__EXCEPTIONS 
-v -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix 
-D__linux -Asystem(posix) -D__NO_INLINE__ -Acpu(i386) -Amachine(i386) 
-Di386 -D__i386 -D__i386__ -D__tune_i386__ /dev/null -o /dev/null
GNU CPP version 2.96 20000731 (Red Hat Linux 7.1 2.96-97) (cpplib) (i386 
Linux/ELF)
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/g++-3
 /usr/local/include
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/include
 /usr/include
End of search list.

Here's the gcc on the Solaris machine I'm having trouble with:

% cpp -v -x c++ /dev/null /dev/null
Reading specs from /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.0.3/specs
Configured with: ../configure --with-as=/usr/local/bin/as 
--with-ld=/usr/local/bin/ld --enable-libgcj
Thread model: posix
gcc version 3.0.3
 /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.0.3/cpp0 -lang-c++ 
-D__GXX_DEPRECATED -D__EXCEPTIONS -D__GXX_ABI_VERSION=100 -v -Dsparc 
-Dsun -Dunix -D__svr4__ -D__SVR4 -D__sparc__ -D__sun__ -D__unix__ 
-D__svr4__ -D__SVR4 -D__sparc -D__sun -D__unix -Asystem=unix 
-Asystem=svr4 -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_XOPEN_SOURCE=500 
-D_LARGEFILE_SOURCE=1 -D_LARGEFILE64_SOURCE=1 -D__EXTENSIONS__ 
-D__GCC_NEW_VARARGS__ -Acpu=sparc -Amachine=sparc /dev/null -o /dev/null
GNU CPP version 3.0.3 (cpplib) (sparc)
ignoring nonexistent directory "/usr/local/sparc-sun-solaris2.8/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include/g++-v3
 /usr/local/include/g++-v3/sparc-sun-solaris2.8
 /usr/local/include/g++-v3/backward
 /usr/local/include
 /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.0.3/include
 /usr/include
End of search list.