Re: [boost] is_single_element?

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-05-17 05:01:04

From: "Daniel Frey" <daniel.frey_at_[hidden]>
> 
> template< typename Container >
> bool is_single_element( const Container& container )
> {
>    // Resolved at compile-time:
>    if( ::boost::is_pointer< Container::iterator >::value )
>      return !container.empty() &&
>        boost::next( container.begin() ) == container.end();
>    else
>      return !container.empty() &&
>        ++container.begin() == container.end();
> }

template<class It> bool is_single_element(It first, It last)
{
    return first != last && ++first == last;
}