sizeof   Description Syntax Examples Argument Types How do I contact the AIS team?

The sizeof function returns the closure size of the argument. The closure size is defined as the number of bytes of uncompressed disk memory required to store the original argument and any objects recursively referenced (reachable) from the argument plus a record header.

The sizeof function returns the disk file closure size of an object or immediate type. Often it is necessary to know how much disk memory an object, together with all of the objects reachable from it, will require. An example would be a Vector of 10 elements, where each item holds a different 100 byte long string object. The length of this Vector will, of course, be 100; but, the sizeof the Vector will exceed 1000 bytes. This is because, to store the Vector on disk, all of the 10 different string objects, reachable from the Vector, must be stored, and each of these string objects is 100 bytes long. The closure size of the Vector would grow if any of its elements were themselves Vectors containing other objects, etc.

(sizeof obj )

Here are a number of links to Lambda coding examples which contain this instruction in various use cases.

Example_ByteVector_sizeof_020

These examples return the closure size of the Vector objects. The closure size would depend on the length of the evaluated objects.

Here are the links to the data types of the function arguments.

Here are also a number of links to functions having arguments with any of these data types.

How do I contact the AIS team? You can always talk with the AIS at aiserver.sourceforge.net.