Re: [Boost-users] equation (really expression) idea

james.jones@firstinvestors.com wrote:

As to mapping, it would be nice to be able to write code like:

double v = expr1(x=5,y=10); double w = expr2(x=2,y=3,z=8);

I should think the Boost parameter library could handle this.

Actually, maybe you don't even need the Boost parameter library. Just define operator() on expression to ignore its arguments (then x=5, y=10 sets the values of x and y, and expr1 is then evaluated in that context).

I agree - this is a more natural notation, as it is closer to what a mathematician would write ("v = expr1(x, y) where x = 5 and y= 10"). Using arrows ("->") looks odd to a mathematician's eyes, as that means "maps to", and it is expr1 that does the mapping, not the variables.