mirror of
https://github.com/ratfactor/ziglings
synced 2024-05-04 16:46:04 +02:00
30 lines
802 B
Zig
30 lines
802 B
Zig
//
|
|
// It's important to note that variable pointers and constant pointers
|
|
// are different types.
|
|
//
|
|
// Given:
|
|
//
|
|
// var foo: u8 = 5;
|
|
// const bar: u8 = 5;
|
|
//
|
|
// Then:
|
|
//
|
|
// &foo is of type "*u8"
|
|
// &bar is of type "*const u8"
|
|
//
|
|
// You can always make a const pointer to a mutable value (var), but
|
|
// you cannot make a var pointer to an immutable value (const).
|
|
// This sounds like a logic puzzle, but it just means that once data
|
|
// is declared immutable, you can't coerce it to a mutable type.
|
|
// Think of mutable data as being volatile or even dangerous. Zig
|
|
// always lets you be "more safe" and never "less safe."
|
|
//
|
|
const std = @import("std");
|
|
|
|
pub fn main() void {
|
|
const a: u8 = 12;
|
|
const b: *u8 = &a; // fix this!
|
|
|
|
std.debug.print("a: {}, b: {}\n", .{ a, b.* });
|
|
}
|