On Fri, Dec 08, 2006 at 12:56:29PM +0000, Sandro Santilli wrote:
Few more comments on this.
> Log message:
> * libbase/log.{cpp,h}: add a templated operator << for
> printing *any* class that has an output operator defined.
> It could replace most operator<< methods, but I won't go
> there for now... just happy with derived Range2d printing
> facility.
> -LogFile::operator << (std::string &s)
> +LogFile::operator << (const std::string &s)
This is needed because stringstream.str() returns a 'const' string,
so if we have NO method that takes a 'const' string the templated
method (const reference to *any* class) is choosed again, resulting
in an infinite recursion.
> +#include <sstream>
Unfortunately the "templated" implementation requires to have
this include in the log.h header...
> +
> + /// Print anything that can be printed on a stringstream
> + //
> + /// This template function could replace ALL but
> + /// operator << (const std::string&) members of
> + /// LogFile class.
> + ///
> + template <class T>
> + LogFile& operator << (const T& any)
> + {
> + std::stringstream ss;
> + ss << any;
> + return *this << ss.str();
> + }
As you can see we could drop *all* operator<< and just
leave the one for std::string. The downside is we'll be
using stringstream for printing *everything*, but the
code would be much more cleaner..
--strk;
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