Test the return type of 'unaryFun' and 'binaryFun'.

Mek101 oidgemek101 at gmail.com
Thu Aug 29 20:14:47 UTC 2019

I made the following enumerations to test the predicates.

>private enum bool isUnaryPredicate(alias pred, Range) = 
>is(typeof(unaryFun!(pred)((ElementType!Range).init)) == bool);
>private enum bool isBinaryPredicate(alias pred, Range, V) = 
>is(typeof(binaryFun!(pred)((ElementType!Range).init, V.init)) == 

Both work as expected. Thank you.

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