r291058 - [Sema] Mark undefined ctors as deleted. NFC.

[George Burgess IV via cfe-commits]

That's a good point, but I don't think they're a big issue: this code has
apparently been this way since 2010, and I only hit this problem because I
was blindly adding `const` to things and looking for what broke. :)

If someone feels differently, I'm happy to swap this to use SFINAE magic.

On Mon, Jan 9, 2017 at 8:34 AM, David Blaikie <dblaikie at gmail.com> wrote:

> Alternatively could make the bool ctor a template with some SFINAE to
> restrict it to only parameters of type bool - thus blocking all conversions
> there, if they're particularly problematic.
>
> On Wed, Jan 4, 2017 at 5:32 PM George Burgess IV via cfe-commits <
> cfe-commits at lists.llvm.org> wrote:
>
>> Author: gbiv
>> Date: Wed Jan  4 19:21:21 2017
>> New Revision: 291058
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=291058&view=rev
>> Log:
>> [Sema] Mark undefined ctors as deleted. NFC.
>>
>> Looks like these functions exist just to prevent bad implicit
>> conversions. Rather than waiting for the linker to complain about
>> undefined references to them, we can mark them as deleted.
>>
>> Modified:
>>     cfe/trunk/include/clang/Sema/Ownership.h
>>
>> Modified: cfe/trunk/include/clang/Sema/Ownership.h
>> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/
>> Sema/Ownership.h?rev=291058&r1=291057&r2=291058&view=diff
>> ============================================================
>> ==================
>> --- cfe/trunk/include/clang/Sema/Ownership.h (original)
>> +++ cfe/trunk/include/clang/Sema/Ownership.h Wed Jan  4 19:21:21 2017
>> @@ -153,8 +153,8 @@ namespace clang {
>>      ActionResult(const DiagnosticBuilder &) : Val(PtrTy()),
>> Invalid(true) {}
>>
>>      // These two overloads prevent void* -> bool conversions.
>> -    ActionResult(const void *);
>> -    ActionResult(volatile void *);
>> +    ActionResult(const void *) = delete;
>> +    ActionResult(volatile void *) = delete;
>>
>>      bool isInvalid() const { return Invalid; }
>>      bool isUsable() const { return !Invalid && Val; }
>> @@ -192,8 +192,8 @@ namespace clang {
>>      ActionResult(const DiagnosticBuilder &) : PtrWithInvalid(0x01) { }
>>
>>      // These two overloads prevent void* -> bool conversions.
>> -    ActionResult(const void *);
>> -    ActionResult(volatile void *);
>> +    ActionResult(const void *) = delete;
>> +    ActionResult(volatile void *) = delete;
>>
>>      bool isInvalid() const { return PtrWithInvalid & 0x01; }
>>      bool isUsable() const { return PtrWithInvalid > 0x01; }
>>
>>
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>
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