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

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-03-03 08:14:36

Johan Nilsson wrote:

[...]

> std::vector<shared_ptr<Foo> > 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>() )
);

(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 );