If Visual C++ _ITERATOR_DEBUG_LEVEL > 0, then
accessing std::array<char[N], M> elements via reference to const
causes compilation error:
...\msvc\14.10.25017\include\array(181): error C2440: 'return': cannot convert from 'const char *' to 'const char (&)[256]'
Alternative workaround is to remove const qualifier from the GetClassName method.