Re: [cxx-abi-dev] A mangling for std::nullptr_t

• To: cxx-abi-dev@xxxxxxxxxxxxxxxx
• Subject: Re: [cxx-abi-dev] A mangling for std::nullptr_t
• From: David Vandevoorde <daveed@xxxxxxx>
• Date: Tue, 2 Mar 2010 11:31:02 -0500

On Sep 18, 2009, at 6:15 PM, David Vandevoorde wrote:

> C++0x defines a typedef std::nullptr_t which aliases a unique (but unnamed) fundamental type.  That type needs a mangling code.
> 
> How about "Dn"?  I.e., adding the production
> 
> 	<builtin-type> ::= Dn
> 
> in the spec?

In addition to the mangling for std::nullptr_t, we also need an RTTI representation.  Since nullptr_t has special conversion requirements (e.g., throwing a nullptr_t value can be caught as a pointer or pointer-to-member value), we propose to add a new simple __nullptr_type_info class (no additional members), rather than e.g. trying to reuse __fundamental_type_info.

Attached are proposed diffs against the current spec.

	Daveed

Attachment: nullptr.diffs
Description: Binary data

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