Function std.experimental.checkedint.ProperCompare.hookOpCmp
Hook for <, <=, >, and >= that ensures comparison against integral
    values has the behavior expected by the usual arithmetic rules. The built-in
    semantics yield surprising behavior when comparing signed values against
    unsigned values, for example 0u < -1. The call hookOpCmp(x, y)
    returns -1 if and only if x is smaller than y in abstract arithmetic
    sense.
						
				auto auto hookOpCmp(L, R)
				(
				
				  L lhs,
				
				  R rhs
				
				);
						
					
				If one of the numbers is an integral and the other is a floating-point
    number, hookOpEquals(x, y) returns a floating-point number that is -1
    if x < y, 0 if x == y, 1 if x > y, and NaN if the floating-point
    number is NaN.
Parameters
| Name | Description | 
|---|---|
| lhs | The left-hand side of the comparison for ordering | 
| rhs | The right-hand side of the comparison for ordering | 
Returns
The result of the comparison (negative if lhs < rhs, positive if     lhs > rhs, 0 if the values are equal)