Error(s):

source_file.cpp:24:5: error: static_assert failed "Incorrect type"
    static_assert(one_of<T, char, float, int>, "Incorrect type");
    ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~
source_file.cpp:34:21: note: in instantiation of template class 'MyClass<double>' requested here
    MyClass<double> v4;//error - incorrect type
                    ^
1 error generated.