Re: libpq++ current sources don't compile with older C++ compilers

Tom, I am sure it is an oversight.  Can you fix it?

> Today I did something I usually do about once per release cycle: try to
> build the system with HP's vendor cc, rather than gcc which I prefer.
> This usually turns up some portability issues, and indeed I found some.
> One that I'm not entirely sure about how to fix is that libpq++ no 
> longer builds at all:
> 
> aCC  +z -I../../../src/interfaces/libpq -I../../../src/include -I/usr/local/include  -c -o pgconnection.o
pgconnection.cc
> Error 56: "pgconnection.cc", line 20 # Namespaces are not yet implemented.
>     using namespace std;
>     ^^^^^^^^^^^^^^^^^^^^
> 
> Given that we have a HAVE_NAMESPACE_STD configure symbol, I do not
> understand why unconditional "using"s have been inserted into the
> libpq++ files.  Shouldn't these be protected by #ifdef
> HAVE_NAMESPACE_STD?  Or is there a different fix that's more
> appropriate?
> 
>             regards, tom lane
> 
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