Re: [boost] Interest check: constant input matching manipulator

Subject: Re: [boost] Interest check: constant input matching manipulator
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-04-08 16:24:30

On Wednesday, April 08, 2009 3:20 PM
Francois Barel wrote:
> Eugene Wee wrote:
> > Does anyone think that adding such a manipulator to Boost would be

+1

> > desirable? I expect the syntax to be along these lines (names and
> > namespaces to be decided):
> > std::cin >> match("a=") >> a;

I'm not entirely comfortable with "match."  What about "literal" or "exactly?"

> Spirit2 already provides such functionality:
>
> #include <boost/spirit/include/qi.hpp>
> #include <boost/spirit/include/qi_stream.hpp>
> [...]
> using namespace boost::spirit;
> using namespace boost::spirit::qi;
> std::cin >> match("a=" >> int_, a);

That's a lot of noise and the syntax is non-obvious for the purpose at hand.  I suspect unwarranted compilation overhead, too.  Something simpler seems in order:

   #include <boost/something/literal.hpp>
   ...
   using boost::something::literal;

   int a;
   std::cin >> literal("a=") >> a;

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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