zig/test/cases/slice.zig

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const assert = @import("std").debug.assert;
const mem = @import("std").mem;
const x = @intToPtr([*]i32, 0x1000)[0..0x500];
const y = x[0x100..];
test "compile time slice of pointer to hard coded address" {
assert(@ptrToInt(x.ptr) == 0x1000);
assert(x.len == 0x500);
assert(@ptrToInt(y.ptr) == 0x1100);
assert(y.len == 0x400);
}
test "slice child property" {
var array: [5]i32 = undefined;
var slice = array[0..];
assert(@typeOf(slice).Child == i32);
}
test "runtime safety lets us slice from len..len" {
var an_array = []u8{
1,
2,
3,
};
assert(mem.eql(u8, sliceFromLenToLen(an_array[0..], 3, 3), ""));
}
fn sliceFromLenToLen(a_slice: []u8, start: usize, end: usize) []u8 {
return a_slice[start..end];
}
test "implicitly cast array of size 0 to slice" {
var msg = []u8{};
assertLenIsZero(msg);
}
fn assertLenIsZero(msg: []const u8) void {
assert(msg.len == 0);
}