This partial specialization of bsl::conditional, for when the (template parameter) value t_COND is false, provides a typedef type that is an alias to the (template parameter) type t_FALSE_TYPE.
Synopsis
Declared in <bslmf_conditional.h>
template<
class t_TRUE_TYPE,
class t_FALSE_TYPE>
struct conditional<false, t_TRUE_TYPE, t_FALSE_TYPE>;