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const std = @import("std");
const builtin = @import("builtin");
const testing = std.testing;
const mem = std.mem;
const expect = testing.expect;
const expectEqual = testing.expectEqual;
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 = @as(u32, 0);
while (i < 5) {
accumulator += array[i];
i += 1;
}
try expect(accumulator == 15);
try expect(getArrayLen(&array) == 5);
}
fn getArrayLen(a: []const u32) usize {
return a.len;
}
test "array init with mult" {
const a = 'a';
var i: [8]u8 = [2]u8{ a, 'b' } ** 4;
try expect(std.mem.eql(u8, &i, "abababab"));
var j: [4]u8 = [1]u8{'a'} ** 4;
try expect(std.mem.eql(u8, &j, "aaaa"));
}
test "array literal with explicit type" {
const hex_mult: [4]u16 = .{ 4096, 256, 16, 1 };
try expect(hex_mult.len == 4);
try expect(hex_mult[1] == 256);
}
test "array literal with inferred length" {
const hex_mult = [_]u16{ 4096, 256, 16, 1 };
try expect(hex_mult.len == 4);
try expect(hex_mult[1] == 256);
}
test "array dot len const expr" {
try expect(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 "array literal with specified size" {
var array = [2]u8{ 1, 2 };
try expect(array[0] == 1);
try expect(array[1] == 2);
}
test "array len field" {
var arr = [4]u8{ 0, 0, 0, 0 };
var ptr = &arr;
try expect(arr.len == 4);
comptime try expect(arr.len == 4);
try expect(ptr.len == 4);
comptime try expect(ptr.len == 4);
}
test "array with sentinels" {
const S = struct {
fn doTheTest(is_ct: bool) !void {
if (is_ct or builtin.zig_is_stage2) {
var zero_sized: [0:0xde]u8 = [_:0xde]u8{};
// Stage1 test coverage disabled at runtime because of
// https://github.com/ziglang/zig/issues/4372
try expect(zero_sized[0] == 0xde);
var reinterpreted = @ptrCast(*[1]u8, &zero_sized);
try expect(reinterpreted[0] == 0xde);
}
var arr: [3:0x55]u8 = undefined;
// Make sure the sentinel pointer is pointing after the last element.
if (!is_ct) {
const sentinel_ptr = @ptrToInt(&arr[3]);
const last_elem_ptr = @ptrToInt(&arr[2]);
try expect((sentinel_ptr - last_elem_ptr) == 1);
}
// Make sure the sentinel is writeable.
arr[3] = 0x55;
}
};
try S.doTheTest(false);
comptime try S.doTheTest(true);
}
test "void arrays" {
var array: [4]void = undefined;
array[0] = void{};
array[1] = array[2];
try expect(@sizeOf(@TypeOf(array)) == 0);
try expect(array.len == 4);
}
test "nested arrays" {
const array_of_strings = [_][]const u8{ "hello", "this", "is", "my", "thing" };
for (array_of_strings) |s, i| {
if (i == 0) try expect(mem.eql(u8, s, "hello"));
if (i == 1) try expect(mem.eql(u8, s, "this"));
if (i == 2) try expect(mem.eql(u8, s, "is"));
if (i == 3) try expect(mem.eql(u8, s, "my"));
if (i == 4) try expect(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;
try expect(s_array[0].b == 1);
try expect(s_array[1].b == 2);
try expect(s_array[2].b == 3);
}
test "implicit comptime in array type size" {
var arr: [plusOne(10)]bool = undefined;
try expect(arr.len == 11);
}
fn plusOne(x: u32) u32 {
return x + 1;
}
test "read/write through global variable array of struct fields initialized via array mult" {
const S = struct {
fn doTheTest() !void {
try expect(storage[0].term == 1);
storage[0] = MyStruct{ .term = 123 };
try expect(storage[0].term == 123);
}
pub const MyStruct = struct {
term: usize,
};
var storage: [1]MyStruct = [_]MyStruct{MyStruct{ .term = 1 }} ** 1;
};
try S.doTheTest();
}
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