mirror of
https://github.com/ziglang/zig.git
synced 2024-11-27 23:52:31 +00:00
45 lines
790 B
Zig
45 lines
790 B
Zig
const std = @import("std");
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const assert = std.debug.assert;
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test "dereference pointer" {
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comptime testDerefPtr();
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testDerefPtr();
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}
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fn testDerefPtr() void {
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var x: i32 = 1234;
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var y = &x;
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y.* += 1;
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assert(x == 1235);
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}
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test "pointer arithmetic" {
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var ptr = c"abcd";
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assert(ptr[0] == 'a');
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ptr += 1;
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assert(ptr[0] == 'b');
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ptr += 1;
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assert(ptr[0] == 'c');
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ptr += 1;
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assert(ptr[0] == 'd');
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ptr += 1;
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assert(ptr[0] == 0);
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ptr -= 1;
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assert(ptr[0] == 'd');
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ptr -= 1;
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assert(ptr[0] == 'c');
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ptr -= 1;
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assert(ptr[0] == 'b');
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ptr -= 1;
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assert(ptr[0] == 'a');
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}
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test "double pointer parsing" {
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comptime assert(PtrOf(PtrOf(i32)) == **i32);
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}
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fn PtrOf(comptime T: type) type {
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return *T;
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}
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