Proto for Boost mailing list page: Re: [proto] invalid use of incomplete type 'detail::uncvref<...>'

Subject: Re: [proto] invalid use of incomplete type 'detail::uncvref<...>'
From: Hossein Haeri (powerprogman_at_[hidden])
Date: 2011-02-22 08:59:04

Just to update you folks: The issue is still around in the just-released Boost 1.46 too... :(

--- On Mon, 21/2/11, Hossein Haeri <powerprogman_at_[hidden]> wrote:

> From: Hossein Haeri <powerprogman_at_[hidden]>
> Subject: [proto] invalid use of incomplete type 'detail::uncvref<...>'
> To: "Proto Mailing List" <proto_at_[hidden]>
> Date: Monday, 21 February, 2011, 18:45
> Dear all,
> 
> [GCC 4.5.1, MinGW32, WinXPSP3, Boost 1.42]
> 
> I have an application in which the following two pieces of
> syntax come handy (where F and G are templatised function
> objects):
> 
> 1) _1 >> F<...>() >> G<...>() -- to
> be equivalent with F(G(x)) when called with _1 == x.
> 
> 2) (_1 || _2) >> F<...>() -- to be equivalent
> with F(x, y) when called with _1 == x and _2 == y.
> 
> The same syntax for F and G above needs also to work for
> ordinary functions.
> 
> I used Proto to give my F's and G's the above desired
> compositional syntax. And, it actually works quite well with
> ordinary functions but becomes quite hairy for certain
> function objects. For example, I have the following
> test-cases where everyone behaves themselves except the line
> marked with ***:
> 
> EW1<InpPool, GameState, AmmoMsg>() >>
> &plus1;
> EW1<InpPool, GameState, AmmoMsg>() >> Plus1();
> 
> (EW1<InpPool, GameState, AmmoMsg>() ||
> EW1<InpPool, GameState, AmmoMsg>()) >>
> Plus2();//***
> (EW1<InpPool, GameState, AmmoMsg>() ||
> EW1<InpPool, GameState, AmmoMsg>()) >>
> &plus2;
> 
> When I compile the *** line, I get a giant spew attached in
> a file called Err.txt. For those kind fellows on the list
> who'd like to see the actual code as well, a *very small*
> zip file is attached to this posting. (The zip file contains
> 2 .cpp's as well 5 .hpp's which simply need to be built
> altogether in a single directory.)
> 
> Anyone having any ideas please?
> 
> TIA,
> --Hossein
> 
> 
>       
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