[Boost-users] Re: Lambda question (deferring evaluation)

3 Mar 2005


      "Peter Dimov"  wrote in message 
news:006101c51ff2$f5868e30$6501a8c0@pdimov2...
...
Johan Nilsson wrote:
[...]
...
std::vector foos(10);
std::for_each(foos.begin(), foos.end(),
             _1 = shared_ptr<Foo>(new Foo));
Lambda way (according to the docs, I haven't tried it):
std::for_each( foos.begin(), foos.end(),
   _1 = bind( constructor< shared_ptr<Foo> >(), new_ptr<Foo>() )
);
I searched the docs but obviously missed/skipped that part ... embarrassing.
...
(probably leaks when new throws)
Old school way:
shared_ptr<Foo> createFoo()
{
   return shared_ptr<Foo>( new Foo );
}
std::generate( foos.begin(), foos.end(), createFoo );
Cleaner, nicer (but one of my intentions was to finally get around to learn 
how to use BLL).

Thanks // Johan