WebJan 15, 2024 · when instantiated and checked for the size of the struct using the unsafe package sizeof function, it gives 24 as the output. a := myStruct{} … WebAug 29, 2024 · struct { address to array len int cap int } So getting the length without using len () could be done like this: package main import ( "fmt" "unsafe" ) type slice struct { ptr uintptr len int cap int } func main () { someSlice := make ( []byte, 666) fmt.Println ( (*slice) (unsafe.Pointer (&someSlice)).len) }

Golang struct size and memory optimisation. - Medium

WebAug 13, 2024 · step 1: compare (instruction CMPQ) the type int16 (loaded with the instruction LEAQ, Load Effective Address) to the inner type of the empty interface … WebThe interesting thing about the empty struct is that, its size is zero (try The Go Playground ): fmt.Println (unsafe.Sizeof (s)) This prints 0, so the empty struct itself takes no … cella vanessa tjahyanto

for sets: map[T]struct{} vs. map[T]bool : r/golang - Reddit

WebApr 19, 2024 · Here we wasted only 5 bytes of memory so you just saw here ordering elements in struct makes memory allocation differently. Conclusion: The best way to create a struct is to put all fields in descending order of data type size so that it reduces the cycle of CPU utilization and memory in RAM. WebOct 9, 2015 · What is it about the presence of an empty struct at the bottom of the type that causes it to increase the size of the struct ? The answer is that while empty struct{} values consume no storage, you can take their address. That is, if you have a type. type T struct { X uint32 Y struct{} } var t T. It is perfectly valid to take the address of t.Y ... WebDec 2, 2024 · This size is on 64-bit architecture: 8 ( int) + 16 ( string header) + 24 (slice header) + 80 ( [10]int64 array size). No implicit padding is required in case of this struct, so this is its final size. cella keittiö