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const std = @import("std");
const testing = std.testing;
const expect = testing.expect;
const expectError = testing.expectError;
test "dereference pointer" {
comptime try testDerefPtr();
try testDerefPtr();
}
fn testDerefPtr() !void {
var x: i32 = 1234;
var y = &x;
y.* += 1;
try expect(x == 1235);
}
test "pointer arithmetic" {
var ptr: [*]const u8 = "abcd";
try expect(ptr[0] == 'a');
ptr += 1;
try expect(ptr[0] == 'b');
ptr += 1;
try expect(ptr[0] == 'c');
ptr += 1;
try expect(ptr[0] == 'd');
ptr += 1;
try expect(ptr[0] == 0);
ptr -= 1;
try expect(ptr[0] == 'd');
ptr -= 1;
try expect(ptr[0] == 'c');
ptr -= 1;
try expect(ptr[0] == 'b');
ptr -= 1;
try expect(ptr[0] == 'a');
}
test "double pointer parsing" {
comptime try expect(PtrOf(PtrOf(i32)) == **i32);
}
fn PtrOf(comptime T: type) type {
return *T;
}
test "implicit cast single item pointer to C pointer and back" {
var y: u8 = 11;
var x: [*c]u8 = &y;
var z: *u8 = x;
z.* += 1;
try expect(y == 12);
}
test "initialize const optional C pointer to null" {
const a: ?[*c]i32 = null;
try expect(a == null);
comptime try expect(a == null);
}
test "assigning integer to C pointer" {
var x: i32 = 0;
var y: i32 = 1;
var ptr: [*c]u8 = 0;
var ptr2: [*c]u8 = x;
var ptr3: [*c]u8 = 1;
var ptr4: [*c]u8 = y;
try expect(ptr == ptr2);
try expect(ptr3 == ptr4);
try expect(ptr3 > ptr and ptr4 > ptr2 and y > x);
try expect(1 > ptr and y > ptr2 and 0 < ptr3 and x < ptr4);
}
test "C pointer comparison and arithmetic" {
const S = struct {
fn doTheTest() !void {
var ptr1: [*c]u32 = 0;
var ptr2 = ptr1 + 10;
try expect(ptr1 == 0);
try expect(ptr1 >= 0);
try expect(ptr1 <= 0);
// expect(ptr1 < 1);
// expect(ptr1 < one);
// expect(1 > ptr1);
// expect(one > ptr1);
try expect(ptr1 < ptr2);
try expect(ptr2 > ptr1);
try expect(ptr2 >= 40);
try expect(ptr2 == 40);
try expect(ptr2 <= 40);
ptr2 -= 10;
try expect(ptr1 == ptr2);
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
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