f81b2531cb
* New AIR instructions: ptr_add, ptr_sub, ptr_elem_val, ptr_ptr_elem_val - See the doc comments for details. * Sema: implement runtime pointer arithmetic. * Sema: implement elem_val for many-pointers. * Sema: support coercion from `*[N:s]T` to `[*]T`. * Type: isIndexable handles many-pointers.
47 lines
923 B
Zig
47 lines
923 B
Zig
const std = @import("std");
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const testing = std.testing;
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const expect = testing.expect;
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const expectError = testing.expectError;
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test "dereference pointer" {
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comptime try testDerefPtr();
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try 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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try expect(x == 1235);
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}
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test "pointer arithmetic" {
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var ptr: [*]const u8 = "abcd";
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try expect(ptr[0] == 'a');
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ptr += 1;
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try expect(ptr[0] == 'b');
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ptr += 1;
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try expect(ptr[0] == 'c');
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ptr += 1;
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try expect(ptr[0] == 'd');
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ptr += 1;
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try expect(ptr[0] == 0);
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ptr -= 1;
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try expect(ptr[0] == 'd');
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ptr -= 1;
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try expect(ptr[0] == 'c');
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ptr -= 1;
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try expect(ptr[0] == 'b');
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ptr -= 1;
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try expect(ptr[0] == 'a');
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}
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test "double pointer parsing" {
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comptime try expect(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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