Re: [boost] Adding polymorphic_value to boost

On 20 November 2017 at 15:43, Peter Dimov via Boost wrote:

Richard Hodges wrote:

It seems to me that the previous name of cloned_ptr is a better choice.

...

_value is fine IMO. You can have

vector v;

and then

v.push_back( Circle(10) ); v.push_back( Ellipse(10, 15) ); v.push_back( Square(11) );

I would drop the U* constructor though. It's a remnant of the times this was called a pointer. U&& is all that's needed.

It's unfortunate we have to use -> instead of . but that's what's available.

The pointer constructor is needed in migration paths from class heirarchies with a `Clone()` method. It also allows one to support objects coming from C_APIs. I'd avoid using it, but it does have its uses.

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