Go pointer

Unlike pointers in C/C++, Go's pointers do not support arithmetic operations and offsetting, making them safe pointers.

Every variable at runtime has an address, which represents its location in memory. Go uses the & character placed before a variable to perform a "take the address" operation on that variable. Go's value types (int, float, bool, string, array, struct) all have corresponding pointer types, such as: *int, *int64, *string, etc.

var a int //declaring actual variables
var b *int //declare a pointer variable pointing to an integer

a = 10
b = &a //retrieve the memory address of the integer variable a and store it in a pointer variable b

fmt.Println("a:", a, ",ptr:", &a)  //a: 10 , ptr: 0xc0003d2f00
fmt.Printf("b:%p type:%T\n", b, b) //b:0xc0003d2f00 type:*int
fmt.Println("&b:", &b)             //&b: 0xc00008cc90

Illustration for b := &a

The address-of operator & and the dereference operator * are complementary: & fetches the address, while * fetches the value pointed to by the address.

1. Performing the address-of (&) operation on a variable and assigning the address to a pointer variable.
2. Performing the dereference (*) operation on a pointer variable to obtain the content pointed to by the pointer variable.

When a pointer is defined but not assigned to any variable, its value is nil. This indicates that the pointer does not point to any valid memory location.

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