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Diffstat (limited to 'exercises/040_pointers2.zig')
| -rw-r--r-- | exercises/040_pointers2.zig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/exercises/040_pointers2.zig b/exercises/040_pointers2.zig index a4852f6..e220336 100644 --- a/exercises/040_pointers2.zig +++ b/exercises/040_pointers2.zig @@ -27,3 +27,19 @@ pub fn main() void { std.debug.print("a: {}, b: {}\n", .{ a, b.* }); } +// +// A look into the future: +// When you allocate memory, you store the returned address in +// a const var. The pointer itself never changes — it always +// refers to the same allocation — but you can still read and +// write the data it points to. +// +// Example: +// +// const buf = try allocator.alloc(u8, 1024); +// buf[0] = 42; // fine: the *contents* are mutable +// +// Note: +// Passing this pointer to a function is cheap: it's just an address +// copied on the stack. The caller can work with the data without +// needing to know where it came from or how it was allocated. |