sizeof

#sizeof

##Syntax sizeof (typeNameOrVariableReference)

##Description The sizeof attribute is used to find the number of bytes used to represent the type or variable. This is implementation-dependent (dirty).

##Example The size of int2 and nat2 is 2.

    var i : int2
    const nat2size := sizeof ( i )  % size is 2

##Details The typeNameOrVariableReference must be the name of a user-defined type, a variable reference, a basic type (such as real), or a constant.

In principle, sizeof returns the number of storage units which would not necessarily be 8-bit bytes. For example, in some older machines, such as the CDC 6000 series, the storage units are 60 bit words. However, almost all modern computers use 8-bit bytes so these are the units of sizeof.

Beware that sizes may reflect alignment constraints in the underlying computer. For example, string sizes may be rounded up to even values (2-byte word alignments).

##See also the indirection.html operator @, cheat.html, explicitintegerconstant.html (how to write hexadecimal constants), and pointers (in particular unchecked.html pointers). See also addr.html, which returns the address of a variable.