Is it possible to obtain address to certain byte of number?

[bleak cove]

val: i32 = 0x123456;
ptr: *u8 = /* get pointer to second byte of val */;

[brisk peak]

std.mem.asBytes(&val)[1]?

or &@ptrCast([*]u8, &val)[1]

[bleak cove]

const std = @import("std");

pub fn main() void {
    var val: i32 = 0x123456;
    var ptr: *u8 = &@ptrCast([*]u8, &val)[1];

    std.debug.print("{}", .{*ptr});
}

error: expected type 'type', found '*u8'
std.debug.print("{}", .{*ptr});
how do you print that?

nevermind

i forgot

its not c

old habits die hard

const std = @import("std");

pub fn main() void {
    var val: i32 = 0x12345678;
    var ptr: *u4 = &@ptrCast([*]u4, &val)[1];

    std.debug.print("{}", .{ptr.*});
}

why this prints 6 instead of 7?

[hexed relic]

because byte is 8 bits, not 4

78 is the same byte, the next byte is 56, but 5 is cut off because of the cast to u4

[bleak cove]

so i cant cast it into array of u4?

[hexed relic]

you can, but it makes no sense

[bleak cove]

var ptr: *u4 = &@ptrCast([*]u4, &val)[1];
val is 32bit and im casting it into array of u4 so it should be 8 * 4bit and each digit of hex is 4 bit

i still dont get it

[hexed relic]

the smallest addressable unit is u8

[bleak cove]

i see

[hexed relic]

at least on most architectures

[bleak cove]

ok thanks