In Roscpp, can I access parameters from different nodes?

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Example: I have always the same node type, lets say with a parameter named "shape"

I make one node (node A) with shape = "square"

I make a second node (node B) with shape = "circle"

in the console if i did rosparam list i would see /nodeA/shape /nodeB/shape

and if i did rosparam get /nodeA/shape i would see "Square", but is it possible in my test file, my cpp file, to use some form of get parameter when creating a node, so that I can see that node A shape is "Square"? pseudocode:

    if(&newNode/shape == &nodeA/shape)
              kill(newNode, SIGINT)

Overall, i want to be able to test and see if a value of the parameter exists, and then if it exists, i will do a kill(pid, SIGINT).

But i am having a hard time accessing the parameter value of the other nodes.