Hi Ed,

I am working on a proposal to implement user-defined literals as a Google
Summer of Code project. I was unaware that someone was already working on
it. If you have already done some work, maybe it is better for me to pick
another project. Or maybe you would be interested in mentoring me and we
could combine our efforts.

Kind regards,
Levon

> ----- Original Message -----
> From: Ed Smith-Rowland <3dw...@verizon.net>
> To: gcc@gcc.gnu.org
> Subject: [C++-0X] User-defined literals
> Date: Mon, 28 Mar 2011 20:13:19 -0400
> 
> 
> Greetings,
> 
> I am taking a new shot at user-defined literals.
> Compared to the previous attempt:
>    * I have altered libcpp so that it tokenizes user defined 
> literals in one chunk properly.
>    * I have started work on new tree nodes and accessors.
>    * I have (or am trying to) refine the checks for argument and 
> template parameter.
> 
> I would like to check that template literal operators have the 
> specific non-type parameter pack:
> template<char...>
>    Foo operator"" sluggo();
> 
> I looked through the internals documentation and didn't see much on 
> this.  Could anyone give me some pointers?
> 
> Also, is there any preference for using VEC vs. TREE_CHAIN for 
> making trees and accessing them?  Is one sort of "modern"?
> 
> Finally I am using compparms to verify that a literal operator 
> argument list conforms to strings like:
> (const char*)
> (const char*, std::size_t)
> (const wchar_t*, std::size_t)
> ...
> I cant get them to work.  I built a set of global trees for the 
> argument types that I want to check.  The char and number tests 
> work.
> I use things like this to build the argument lists (I neglect the 
> return type).
>      userdef_lit_char16_str_type
>       = build_function_type_list (void_type_node, char16_array_type_node,
>                   size_type_node, NULL_TREE);
> I'm hoping that this matches
> (const char16_t*, std::size_t)
> but it doesn't.
> 
> Ideas?
> 
> Thanks,
> 
> Ed Smith-Rowland

>


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