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Though it may not be the "cleanest" solution, you can initialize the const message in the initialization list of the class using the lambda initialization trick (See https://stackoverflow.com/q/11037650 and https://herbsutter.com/2013/04/05/complex-initialization-for-a-const-variable/). This trick seems to be underutilized in the C++ community even though it's been available since C++11.