[cfe-commits] r151170 - in /cfe/trunk: lib/Sema/SemaOverload.cpp test/CXX/expr/expr.prim/expr.prim.lambda/blocks.mm

Douglas Gregor dgregor at apple.com
Fri Mar 9 15:30:51 PST 2012

On Mar 7, 2012, at 6:55 PM, John McCall wrote:

> On Mar 7, 2012, at 6:39 PM, Douglas Gregor wrote:
>> On Mar 7, 2012, at 6:33 PM, John McCall wrote:
>>> On Feb 22, 2012, at 9:32 AM, Douglas Gregor wrote:
>>>> Author: dgregor
>>>> Date: Wed Feb 22 11:32:19 2012
>>>> New Revision: 151170
>>>> URL: http://llvm.org/viewvc/llvm-project?rev=151170&view=rev
>>>> Log:
>>>> Teach overload resolution to prefer user-defined conversion via a
>>>> lambda closure type's function pointer conversion over user-defined
>>>> conversion via a lambda closure type's block pointer conversion,
>>>> always. This is a preference for more-standard code (since blocks
>>>> are an extension)  and a nod to efficiency, since function pointers
>>>> don't require any memory management. Fixes PR12063.
>>> Why does this have anything to do with Objective-C?
>>> Blocks are a C extension.
>> The memory-management model for the conversion to block pointer is retain+autorelease. Since we don't have an 'autorelease' equivalent in C-with-blocks, we opted to omit the block pointer conversion rather than invent another memory-management scheme.
>> Yes, we could probably come up with another solution, but IMO the user base for C++11-with-blocks-and-lambdas that isn't Objective-C++11 is too small to bother inventing something now.
> Mmm, alright.  Is this documented somewhere?


	- Doug

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