using synfig::LinkableValueNode::set_link_vfunc;
static bool check_type(ValueBase::Type type);
static ValueNode_BLineCalcTangent* create(const ValueBase &x=ValueBase::TYPE_VECTOR);
using synfig::LinkableValueNode::set_link_vfunc;
static bool check_type(ValueBase::Type type);
static ValueNode_BLineCalcTangent* create(const ValueBase &x=ValueBase::TYPE_VECTOR);