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BDE 4.39.x Production Release
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#include <bslmf_isconvertible.h>
This struct template implements a meta-function to determine if the (template parameter) t_FROM_TYPE is convertible to the (template parameter) t_TO_TYPE. This struct derives from bsl::true_type if the t_FROM_TYPE is convertible to t_TO_TYPE, and from bsl::false_type otherwise.
t_FROM_TYPE and t_TO_TYPE should be complete types, arrays of unknown bound, or (possibly cv-qualified) void types.