W3cubDocs

/Crystal 0.31

sizeof

The sizeof expression returns an Int32 with the size in bytes of a given type. For example:

sizeof(Int32)  #=> 4
sizeof(Int64)  #=> 8

For Reference types, the size is the same as the size of a pointer:

# On a 64 bits machine
sizeof(Pointer(Int32)) #=> 8
sizeof(String)         #=> 8

This is because a Reference's memory is allocated on the heap and a pointer to it is passed around. To get the effective size of a class, use instance_sizeof.

The argument to sizeof is a type and is often combined with typeof:

a = 1
sizeof(typeof(a)) #=> 4

To the extent possible under law, the persons who contributed to this workhave waived
all copyright and related or neighboring rights to this workby associating CC0 with it.
https://crystal-lang.org/docs/syntax_and_semantics/sizeof.html