Removing unnecessary inline qualify to pure virtual function #545
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As per the C++ specification, there is nothing preventing us from declaring a pure virtual function 'inline'. Nevertheless, some compilers, by static analysis, flags this with a warning. Furthermore, some people turn warnings into errors. And so you go from code that is legal, down to an error.
Note that there probably is no sense in this library to have the virtual function inline, so I am not defending the code as it appeared. It just seems that it was harmless as is.
Fixes #544