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BDE 4.39.x Production Release
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#include <bslmf_isclass.h>
This struct template implements the is_class meta-function defined in the C++11 standard [meta.unary.cat] to determine if the (template parameter) t_TYPE is a class.
union types as classes. This would be correct according to the core language definition of a class type, but is an error according to the standard library definition of this type trait.