Re: [boost] [ValueRef]

Subject: Re: [boost] [ValueRef]
From: Joaquin M Lopez Munoz (joaquin_at_[hidden])
Date: 2015-04-20 14:39:57

THOMAS JORDAN <tomjordan766 <at> gmail.com> writes:

> 
> > From: Andrey Semashev <andrey.semashev <at> gmail.com>
> 
> > Is this similar to Boost.Flyweight?
> 
> It is similar in that both provide a 'smart' handle which can be used
> pretty much as a drop in for the wrapped type.
> 
> However, Boost.Flyweight requires the wrapped type to be hashable.

Not necessarily; set_factory, for instance, requires values to
be less-than comparable:

http://boost.org/libs/flyweight/doc/tutorial/configuration.html#set_factory

Also, see below.

> Also, there is a level of indirection with Flyweight which can mean that
> unnecessary temps may need to be created to do the initial lookup (and
> addition) to the Flyweight store, unless you use the Flyweight key-map
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