class_docstr: Layoutable provides a mix-in class to support the
  add operation for creating a layout from the operands.
class_docstr_tok: ["Layoutable","provides","a","mix-in","class","to","support","the","add","operation","for","creating","a","layout","from","the","operands","."]
code: def __radd__(self, other):
      return self.__class__.__add__(other, self)
  
imports: import numpy
  import param
  from .None import traversal
  from .dimension import Dimension, Dimensioned, ViewableElement, ViewableTree
  from .ndmapping import NdMapping, UniformNdMapping
label_desc: Use image node_id 2 for calling the Layoutable obj's underlying member method code with example usage: obj.__radd__(other) and returns: self