October 2015
Beginner to intermediate
400 pages
14h 44m
English
Content preview from The Go Programming Language13.1
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13.1 unsafe.Sizeof, Alignof, and Offsetof
The unsafe.Sizeof function reports the size in bytes
of the representation of its operand,
which may be an expression of any type; the expression is not
evaluated.
A call to Sizeof is a constant expression of type
uintptr,
so the result may be used as the dimension of an array
type, or to compute other constants.
import "unsafe" fmt.Println(unsafe.Sizeof(float64(0))) // "8"
Sizeof reports only the size of the fixed part of each data structure, like the pointer and length of a string, but not indirect parts like the contents of the string. Typical sizes for all non-aggregate Go types are shown below, though the exact sizes may vary by toolchain. For portability, we’ve ...
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