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Diffstat (limited to 'exercises/54_manypointers.zig')
| -rw-r--r-- | exercises/54_manypointers.zig | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/exercises/54_manypointers.zig b/exercises/54_manypointers.zig deleted file mode 100644 index 23f2ae5..0000000 --- a/exercises/54_manypointers.zig +++ /dev/null @@ -1,55 +0,0 @@ -// -// You can also make pointers to multiple items without using a slice. -// -// var foo: [4]u8 = [4]u8{ 1, 2, 3, 4 }; -// var foo_slice: []u8 = foo[0..]; -// var foo_ptr: [*]u8 = &foo; -// -// The difference between foo_slice and foo_ptr is that the slice has -// a known length. The pointer doesn't. It is up to YOU to keep track -// of the number of u8s foo_ptr points to! -// -const std = @import("std"); - -pub fn main() void { - // Take a good look at the array type to which we're coercing - // the zen12 string (the REAL nature of strings will be - // revealed when we've learned some additional features): - const zen12: *const [21]u8 = "Memory is a resource."; - // - // It would also have been valid to coerce to a slice: - // const zen12: []const u8 = "..."; - // - // Now let's turn this into a "many pointer": - const zen_manyptr: [*]const u8 = zen12; - - // It's okay to access zen_manyptr just like an array or slice as - // long as you keep track of the length yourself! - // - // A "string" in Zig is a pointer to an array of const u8 values - // or a slice of const u8 values, into one, as we saw above). So, - // we could treat a "many pointer" of const u8 a string as long - // as we can CONVERT IT TO A SLICE. (Hint: we do know the length!) - // - // Please fix this line so the print below statement can print it: - const zen12_string: []const u8 = zen_manyptr; - - // Here's the moment of truth! - std.debug.print("{s}\n", .{zen12_string}); -} -// -// Are all of these pointer types starting to get confusing? -// -// FREE ZIG POINTER CHEATSHEET! (Using u8 as the example type.) -// +---------------+----------------------------------------------+ -// | u8 | one u8 | -// | *u8 | pointer to one u8 | -// | [2]u8 | two u8s | -// | [*]u8 | pointer to unknown number of u8s | -// | [2]const u8 | two immutable u8s | -// | [*]const u8 | pointer to unknown number of immutable u8s | -// | *[2]u8 | pointer to an array of 2 u8s | -// | *const [2]u8 | pointer to an immutable array of 2 u8s | -// | []u8 | slice of u8s | -// | []const u8 | slice of immutable u8s | -// +---------------+----------------------------------------------+ |