On Feb 2, 2016, at 11:45 , Jens Alfke <[email protected]> wrote:
>
> (To be clear: I understand why this behaves differently, due to the [awful]
> decision to make NSInteger different sizes in 32-bit vs 64-bit. But at a high
> level it’s an inconsistent warning, when you have multiple platforms to build
> for.)
As suggested by Greg Parker on this list a couple of years ago, you can use
%t… (%td, %to, %tu %tx, %tX) for unsigned results
%z… (%zd, %zo, %zu %zx, %zX) for signed results
and these work on NS[U]Integer-sized variables on all platforms and
architectures that are supported by Apple (without having to cast the
parameters).
The ’t’ or ‘z’ controls whether the conversion is unsigned or signed. The ‘d’
or ‘u’ controls whether the parameter is an signed or unsigned variable. This
is kinda a distinction without a difference, so, normally, it’s %tu for
NSUInteger, and %zd for NSInteger.
These modifiers are documented here:
https://developer.apple.com/library/prerelease/watchos/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html
but using them for this purpose is a trick that is (AFAIK) Greg’s own
brain-storm.
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