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const std = @import("std");
const testing = std.testing;
const expect = testing.expect;
const mem = std.mem;
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 "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();
}
test "implicit cast single-item pointer" {
try testImplicitCastSingleItemPtr();
comptime try testImplicitCastSingleItemPtr();
}
fn testImplicitCastSingleItemPtr() !void {
var byte: u8 = 100;
const slice = @as(*[1]u8, &byte)[0..];
slice[0] += 1;
try expect(byte == 101);
}
fn testArrayByValAtComptime(b: [2]u8) u8 {
return b[0];
}
test "comptime evaluating function that takes array by value" {
const arr = [_]u8{ 1, 2 };
const x = comptime testArrayByValAtComptime(arr);
const y = comptime testArrayByValAtComptime(arr);
try expect(x == 1);
try expect(y == 1);
}
test "runtime initialize array elem and then implicit cast to slice" {
var two: i32 = 2;
const x: []const i32 = &[_]i32{two};
try expect(x[0] == 2);
}
test "array literal as argument to function" {
const S = struct {
fn entry(two: i32) !void {
try foo(&[_]i32{ 1, 2, 3 });
try foo(&[_]i32{ 1, two, 3 });
try foo2(true, &[_]i32{ 1, 2, 3 });
try foo2(true, &[_]i32{ 1, two, 3 });
}
fn foo(x: []const i32) !void {
try expect(x[0] == 1);
try expect(x[1] == 2);
try expect(x[2] == 3);
}
fn foo2(trash: bool, x: []const i32) !void {
try expect(trash);
try expect(x[0] == 1);
try expect(x[1] == 2);
try expect(x[2] == 3);
}
};
try S.entry(2);
comptime try S.entry(2);
}
test "double nested array to const slice cast in array literal" {
const S = struct {
fn entry(two: i32) !void {
const cases = [_][]const []const i32{
&[_][]const i32{&[_]i32{1}},
&[_][]const i32{&[_]i32{ 2, 3 }},
&[_][]const i32{
&[_]i32{4},
&[_]i32{ 5, 6, 7 },
},
};
try check(&cases);
const cases2 = [_][]const i32{
&[_]i32{1},
&[_]i32{ two, 3 },
};
try expect(cases2.len == 2);
try expect(cases2[0].len == 1);
try expect(cases2[0][0] == 1);
try expect(cases2[1].len == 2);
try expect(cases2[1][0] == 2);
try expect(cases2[1][1] == 3);
const cases3 = [_][]const []const i32{
&[_][]const i32{&[_]i32{1}},
&[_][]const i32{&[_]i32{ two, 3 }},
&[_][]const i32{
&[_]i32{4},
&[_]i32{ 5, 6, 7 },
},
};
try check(&cases3);
}
fn check(cases: []const []const []const i32) !void {
try expect(cases.len == 3);
try expect(cases[0].len == 1);
try expect(cases[0][0].len == 1);
try expect(cases[0][0][0] == 1);
try expect(cases[1].len == 1);
try expect(cases[1][0].len == 2);
try expect(cases[1][0][0] == 2);
try expect(cases[1][0][1] == 3);
try expect(cases[2].len == 2);
try expect(cases[2][0].len == 1);
try expect(cases[2][0][0] == 4);
try expect(cases[2][1].len == 3);
try expect(cases[2][1][0] == 5);
try expect(cases[2][1][1] == 6);
try expect(cases[2][1][2] == 7);
}
};
try S.entry(2);
comptime try S.entry(2);
}
test "anonymous literal in array" {
const S = struct {
const Foo = struct {
a: usize = 2,
b: usize = 4,
};
fn doTheTest() !void {
var array: [2]Foo = .{
.{ .a = 3 },
.{ .b = 3 },
};
try expect(array[0].a == 3);
try expect(array[0].b == 4);
try expect(array[1].a == 2);
try expect(array[1].b == 3);
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
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