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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


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