Re: [boost] [Boost.Breakable] Any interest in a Boost Breakable library?

Subject: Re: [boost] [Boost.Breakable] Any interest in a Boost Breakable library?
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2009-09-07 18:02:26

Pierre Morcello wrote:

 > I propose a set of macros that allow to break anywhere. Example of 
use of the main macro :
 >
 > // do something...
 > BOOST_BREAKABLE
 > {
 >     if (test1)
 >     {
 >           break;
 >     }
 >     if (test2)
 >
 >     {
 >
 >           break;
 >
 >     }
 >
 >
 >     std::cout<<"this is never reached if test1==true or test2==true. 
"<<std::endl;
 >     // do something...
 > }
 > // here the program continues ...

What about using a lambda?
[&]() -> void
{
     if(test1)
         return;

     if(test2)
         return;

     std::cout << "this is never reached if test1==true or test2==true."
               << std::endl;
     // do something...
}();

That kind of thing can also be made with macros instead of lambdas using
a similar technique to that of Boost.ScopeExit.

This also has the potential of being able to return values, which can be
pretty useful to initialize an object for example.