[cxx-abi-dev] Mangling sizeof

[Jason Merrill]

John H. Spicer wrote:
> On Mar 11, 2009, at 12:34 PM, Jason Merrill wrote:

>>  decltype (*(T*)0 + *(T*)0) f (T t);
>> and
>>  auto f(T t) -> decltype (t + t)

> If your program uses both forms of that declaration it is already 
> ill-formed because the declarations are functionally equivalent but not 
> equivalent by the rules in 14.5.6.1.

Yes, but I like the idea of giving library implementers the ability to 
switch between the two forms without affecting binary compatibility. 
But perhaps that's just a one-time transition issue.

Jason