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nativesizeof
Combined from primary sources listed below.

In Native calling interface§

See primary documentation in context for sub nativesizeof. 

sub nativesizeof($obj) is export(:DEFAULT)

This returns the size in bytes of the supplied object, it can be thought of as being equivalent to sizeof in C. The object can be a builtin native type such as int64 or num64, a CArray or a class with the repr CStruct, CUnion or CPointer.