[swift-users] Passing variadic C args through?

[Rick Mann via swift-users]

I've had a long-working `debugLog()` method that looks like this:

```
func
debugLog<T>(_ inMsg: T, file inFile : String = #file, line inLine : Int = #line)
{
        let file = (inFile as NSString).lastPathComponent
        let s = "\(file):\(inLine)    \(inMsg)"
        print(s)
}
```

I wanted to add a version that works like `String(format:)`:

```
func
debugLog(format inFormat: String, file inFile : String = #file, line inLine : 
Int = #line, _ inArgs: CVarArg...)
{
        let s = String(format: inFormat, inArgs)
        debugLog(s, file: inFile, line: inLine)
}

```

While this compiles and executes, all of the values are zero for this example:

```
let xc = CGFloat(1.0)
let yc = CGFloat(0.0)
let len = CGFloat(282.1364917907643)

debugLog(format: "Pixel %f, %f length too far %f", xc, yc, len)
```

Output:

```
FisheyeImageRenderer.swift:108    Pixel 0.000000, 0.000000 length too far 
0.000000
```

Something is being misinterpreted in the passing of `inArgs: CVarArg...`

TIA,

-- 
Rick Mann
rm...@latencyzero.com



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