In my C-interop, I have a need to do this a lot:
typedef struct {
char message[LGS_MAX_MESSAGE_SIZE];
...other stuff...
} lgs_result_info_t;
func
callbackFailed(info inInfo: lgs_result_info_t)
{
var m = inInfo.message // *See note below
let message: String = withUnsafePointer(to: &m)
{ inArg -> String in
return String(cString: UnsafeRawPointer(inArg).assumingMemoryBound(to:
Int8.self))
}
debugLog("Failed: \(message)")
}
I'd like to do something like this:
extension
String
{
init<T>(withUnsafePointerTo inPtr: T)
{
withUnsafePointer(to: &inPtr)
{ inArg in
init(cString: UnsafeRawPointer(inArg).assumingMemoryBound(to:
Int8.self))
}
}
}
But I can't get that to compile.
Help is greatly appreciated.
---
*I can't pass inInfo directly to withUnsafePointer, because it says "Cannot
pass immutable value as inout argument: 'inInfo' is a 'let' constant"
--
Rick Mann
[email protected]
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