Re: [boost] Interest in updated expression template library?

Subject: Re: [boost] Interest in updated expression template library?
From: Zach Laine (whatwasthataddress_at_[hidden])
Date: 2017-01-17 01:51:01

On Mon, Jan 16, 2017 at 12:27 PM, Brook Milligan <brook_at_[hidden]> wrote:

>
> In the meantime, I have been playing a bit more with the library and would
> like to reiterate at least one point from my 2017-01-12 email.  As far as I
> can tell, there is no reason to restrict capturing an expression into
> expression_wrapper<> by moving it.  I made another version that copies and
> it works fine.  I have used that with std::reference_wrapper and a special
> wrapper that I use to wrap rvalues (i.e., it moves those into either itself
> or onto the heap so that it preserve the reference semantics yet can be
> copied).  Both worked perfectly, can be stored in std::function<>, etc.  It
> would be nice to support the more general use case of an
> expression_function<> acting as a reference to another expression when
> constructed from an lvalue.  Then it could be used anywhere as a proxy for
> evaluating any expression.  That seems like a really useful feature.

Thanks for bringing this back up! I totally missed it the first time.  The
move was perhaps a copy/paste error.

Zach