Re: [Boost-users] Metaprogramming Question

11 Feb 2012

      On 2/10/2012 7:35 AM, Nat Linden wrote:
...
On Thu, Feb 9, 2012 at 11:05 PM, John M. Dlugosz  wrote:
...
On 2/9/2012 1:49 PM, Nat Linden wrote:
...
...
template<typename FUNCTOR>
void ourmacro_f(const FUNCTOR&  f)
{
     f(hidden_ostream_object);
}
#define OURMACRO(EXPRESSION) (ourmacro_f(boost::lambda::_1<<
EXPRESSION))
...
How is that different from just using:
#define OURMACRO(EXPRESSION) hidden_stream_object<<  EXPRESSION
Simply that hidden_stream_object really isn't visible in the calling
context. It's local to the context of ourmacro_f().
Sorry, I'm still not seeing the point.  The name hidden_stream_object is not in scope here 
but ourmacro_f is instead?  So what?

Or, a plain function to return the stream object?

	ostream& get_stream() { return hidden_stream_object; }

	#define OURMACRO(EXPRESSION) get_stream()<< EXPRESSION