Decouples evaluation of a piecewise_function from the function itself (#5344)

src/ifcgeom/mapping/IfcPointByDistanceExpression.cpp

@@ -19,6 +19,7 @@
 
 #include "mapping.h"
 #include "../profile_helper.h"
+#include "../piecewise_function_evaluator.h"
 
 #define mapping POSTFIX_SCHEMA(mapping)
 using namespace ifcopenshell::geometry;
@@ -31,7 +32,8 @@ taxonomy::ptr mapping::map_impl(const IfcSchema::IfcPointByDistanceExpression* i
    //auto item = map(basis_curve);
    //auto pw_curve = ifcopenshell::geometry::piecewise_from_item(item);
    auto pw_curve = taxonomy::dcast<taxonomy::piecewise_function>(map(inst->BasisCurve()));
-   auto m = pw_curve->evaluate(u);
+   piecewise_function_evaluator evaluator(pw_curve,&settings_);
+   auto m = evaluator.evaluate(u);
 
    auto o = m.col(3).head<3>();
    auto z = m.col(2).head<3>();