[C++17] Remove inheritance from std::binary_function, std::unary_function.
authorRichard Kreckel <kreckel@ginac.de>
Fri, 29 Jan 2016 22:45:21 +0000 (23:45 +0100)
committerRichard Kreckel <kreckel@ginac.de>
Fri, 29 Jan 2016 22:48:01 +0000 (23:48 +0100)
This inheritance is unneeded since C++11 and the two classes may be
removed in C++-17.


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