"Daniel Wallin" <dalwan01@student.umu.se> wrote in message news:cnidaq$tim$1@sea.gmane.org...
David Abrahams wrote:
However, Thorsten's prodding has made me wonder if we need || for the lazy case at all. It seems as though
params.has(name) ? params[name] : something_else;
is superior in every way except brevity. And there will be substantial cases where it's briefer as well, because there's no need to build a function object for something_else.
Am I missing something?
Yes, I think you are. We want params[name] to be a compilation error if there is no such parameter supplied by the user and no default. I don't think the proposed construct can allow that.
IMO, a runtime error here is just not acceptable.
I disagree. I don't see compile-time error as an advantage here, but only a burden. I very much prefer to be able to write if( params.has(name) ) f( params[name], ... ) else f( ... )
-- Daniel Wallin
Gennadiy.