To use the node in your project you should have the koadrobot/maths library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.
C++ implementation
#pragma XOD dirtieness disable
struct State {};
{{ GENERATED_CODE }}
void evaluate(Context ctx) {
Number lhs = getValue<input_IN1>(ctx);
Number rhs = getValue<input_IN2>(ctx);
emitValue<output_OUT>(ctx, (lhs > rhs)?lhs:rhs);
}