Codereview: polymorphic message container

polymorphic message container
I hope you found a solution that worked for you :)
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Thanks to all those great people for their contributions!

(codereview.stackexchange.com/users/161776/taylor)Taylor
(codereview.stackexchange.com/users/507/loki-astari)Loki Astari
(codereview.stackexchange.com/users/75307/toby-speight)Toby Speight
(codereview.stackexchange.com/users/288556/jeong-sooquen)Jeong Sooquen
(codereview.stackexchange.com/users/288556/jeong-sooquen)Jeong Sooquen
A special thanks goes out to the (codereview.stackexchange.com/questions/294748/polymorphic-message-container)Stackexchange community

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If anything is off, please write me at peter D.O.T schneider A.T ois42.de

c++ pointers polymorphism