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const assert = @import("std").debug.assert;
const mem = @import("std").mem;
test "arrays" {
var array: [5]u32 = undefined;
var i: u32 = 0;
while (i < 5) {
array[i] = i + 1;
i = array[i];
}
i = 0;
var accumulator = u32(0);
while (i < 5) {
accumulator += array[i];
i += 1;
}
assert(accumulator == 15);
assert(getArrayLen(array) == 5);
}
fn getArrayLen(a: []const u32) usize {
return a.len;
}
test "void arrays" {
var array: [4]void = undefined;
array[0] = void{};
array[1] = array[2];
assert(@sizeOf(@typeOf(array)) == 0);
assert(array.len == 4);
}
test "array literal" {
const hex_mult = []u16{
4096,
256,
16,
1,
};
assert(hex_mult.len == 4);
assert(hex_mult[1] == 256);
}
test "array dot len const expr" {
assert(comptime x: {
break :x some_array.len == 4;
});
}
const ArrayDotLenConstExpr = struct {
y: [some_array.len]u8,
};
const some_array = []u8{
0,
1,
2,
3,
};
test "nested arrays" {
const array_of_strings = [][]const u8{
"hello",
"this",
"is",
"my",
"thing",
};
for (array_of_strings) |s, i| {
if (i == 0) assert(mem.eql(u8, s, "hello"));
if (i == 1) assert(mem.eql(u8, s, "this"));
if (i == 2) assert(mem.eql(u8, s, "is"));
if (i == 3) assert(mem.eql(u8, s, "my"));
if (i == 4) assert(mem.eql(u8, s, "thing"));
}
}
var s_array: [8]Sub = undefined;
const Sub = struct {
b: u8,
};
const Str = struct {
a: []Sub,
};
test "set global var array via slice embedded in struct" {
var s = Str{ .a = s_array[0..] };
s.a[0].b = 1;
s.a[1].b = 2;
s.a[2].b = 3;
assert(s_array[0].b == 1);
assert(s_array[1].b == 2);
assert(s_array[2].b == 3);
}
test "array literal with specified size" {
var array = [2]u8{
1,
2,
};
assert(array[0] == 1);
assert(array[1] == 2);
}
test "array child property" {
var x: [5]i32 = undefined;
assert(@typeOf(x).Child == i32);
}
test "array len property" {
var x: [5]i32 = undefined;
assert(@typeOf(x).len == 5);
}
test "array len field" {
var arr = [4]u8{ 0, 0, 0, 0 };
var ptr = &arr;
assert(arr.len == 4);
comptime assert(arr.len == 4);
assert(ptr.len == 4);
comptime assert(ptr.len == 4);
}
test "single-item pointer to array indexing and slicing" {
testSingleItemPtrArrayIndexSlice();
comptime testSingleItemPtrArrayIndexSlice();
}
fn testSingleItemPtrArrayIndexSlice() void {
var array = "aaaa";
doSomeMangling(&array);
assert(mem.eql(u8, "azya", array));
}
fn doSomeMangling(array: *[4]u8) void {
array[1] = 'z';
array[2..3][0] = 'y';
}
test "implicit cast single-item pointer" {
testImplicitCastSingleItemPtr();
comptime testImplicitCastSingleItemPtr();
}
fn testImplicitCastSingleItemPtr() void {
var byte: u8 = 100;
const slice = (*[1]u8)(&byte)[0..];
slice[0] += 1;
assert(byte == 101);
}
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