[macstl-dev] IIf function -- opinions wanted

[Glen Low]

Hi all

John Terrell wanted a "merge conditional" function akin to Altivec's 
vec_sel opcode (and the inbuilt C++ ternary logic operator ?:) to be in 
the vec common interface, and I think it's a reasonable request for 
0.2.2. Any takers for the name? So e.g.

iif (condition, true_clause, false_clause)

1.	iif -- inspired by Visual Basic, somewhat terse though.
2.	if_then -- seen this in Boost Lambda. However so far nothing in the 
common interface has an underscore, so far.
3.	if_then_else -- more explicit what it does
4.	sel or select -- show its similarity to vec_sel, however may be 
confusing as vec_sel (and thus altivec::sel) has a different order of 
parameters.
5.	cond or condition -- doesn't read off as easily

The main focus of the common interface is to introduce functions that 
do not require a thorough knowledge of the underlying SIMD 
architecture, so a name that rings familiar to the target audience 
would be best.



Cheers, Glen Low


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