Question about conditionals.

Hi Emanuel-

Looking at how to handle conditionals, as not everything maps to linear functions. I'd really like a fn (a,b,c) which returns b if a else c, or functionality equivalent to a ? b : c

I don't see anything supporting that in the framework. Lunchtime hacking turned up the below.

If this approach is good, it may be worth including in examples. If not, what is the recommended approach, and is a ternary operator a reasonable feature request?

Thanks!

Duncan

        context.RegisterLogical("<=", (a, b) => a <= b, Precedence.Addition);
        context.RegisterLogical(">", (a, b) => a > b, Precedence.Addition);

        context.RegisterBinary("if",(a,b) => (b != 0) ? a : 0, Precedence.Addition);

        MathExpr expr = new MathExpr("({x} if {x} <= 0.5) + (({x} - 0.5) if ({x} > 0.5))", context);

        var fn = expr.Compile("x");

        Debug.Assert(IsNear(fn(0.0), 0));
        Debug.Assert(IsNear(fn(0.75), 0.25));

Start with the MathExpr and Context registration calls shown in the issue, then inspect how operators and conditional expressions are parsed and compiled. Determine whether the project should support a ternary operator, recommend the shown custom-operator approach, or add an example; done requires a maintainer-approved direction and the corresponding implementation or example.