The linker error alone doesn't make the root cause obvious, but it's a fairly well known and well documented problem: http://www.parashift.com/c++-faq-lite/strange-inheritance.html#faq-23.10
The linker error alone doesn't make the root cause obvious, but it's a fairly well known and well documented problem: www.parashift. com/c++ -faq-lite/ strange- inheritance. html#faq- 23.10
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