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#include <bslmf_isempty.h>
This struct
is a meta-function to determine whether the (template parameter) t_TYPE
is an empty class type. is_empty
inherits from true_type
if t_TYPE
is a class
or struct
with no non-static data members other than bit-fields of length 0, no virtual member functions, no virtual base classes, and no base class B
for which is_empty<B>value
is false
; otherwise is_empty
inherits from false_type
. Note that this meta-function will fail to compile for a union that is the same size as an empty class in C++03.