[AGENT++] Building errors caused by using namespace Snmp_pp in the libagent.h file(AGENT++)

[Zwam, van Brian]

Hi,

I want to report a problem I ran into when using the AGENT++ library.

In the configure script of agent++ a file named "libagent.h" is created.
This file defines "using namespace Snmp_pp" if in the SNMP++ library the option --enable-namespace is enable.  In my program this causes build problems with my own applications variables and even with other Third party library such as postgresql.

Example of build error with third party library:
In file included from include/sico/DataBaseHandler.hxx:13:0,
                 from src/sico/Sico.cxx:75:
/usr/include/libpq-fe.h:222:2: error: reference to 'Oid' is ambiguous
  Oid   tableid;  /* source table, if known */
  ^
In file included from /usr/include/libpq-fe.h:29:0,
                 from include/sico/DataBaseHandler.hxx:13,
                 from src/sico/Sico.cxx:75:
/usr/include/postgres_ext.h:29:22: note: candidates are: typedef unsigned int Oid
typedef unsigned int Oid;
                      ^
In file included from target/dev/external/include/snmp_pp/snmp_pp.h:61:0,
                 from target/dev/external/include/agent_pp/agent++.h:59,
                 from target/dev/external/include/libagent.h:218,
                 from target/dev/external/include/agent_pp/mib.h:25,
                 from target/dev/include/qbc/acms/varbase.hxx:41,
                 from target/dev/include/qbc/acms/var.hxx:36,
                 from target/dev/include/qbc/acms/stringvar.hxx:30,
                 from include/sico/AcmsSico.hxx:22,
                 from src/sico/Sico.cxx:43:
target/dev/external/include/snmp_pp/oid.h:90:14: note:                 class Snmp_pp::Oid
class DLLOPT Oid : public SnmpSyntax


I have  a lot more of these build errors. I can't remove the using namespace statement in the libagent.h file, because then I also have to modify the whole agent++ library to use the snmp++ namespace prefix. In general you DON'T define "using namespace <namespace>" in your header file.

Solution:
Just remove the using namespaces from the libagent.h file and use the namespace prefix of SNMP++ and STD in the AGENT++ code.


Kind regards,

Brian van Zwam