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langref: mention slice-by-length pattern

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dweiller 2023-05-02 12:51:58 +10:00
parent 64e319f555
commit 5bb8e9cd97
1 changed files with 8 additions and 0 deletions
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doc/langref.html.in
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@ -2953,6 +2953,14 @@ test "basic slices" {
const array_ptr = array[0..array.len];
try expect(@TypeOf(array_ptr) == *[array.len]i32);
// You can perform a slice-by-length by slicing twice. This allows the compiler
// to perform some optimisations like recognising a comptime-known length when
// the start position is only known at runtime.
var runtime_start: usize = 1;
const length = 2;
const array_ptr_len = array[runtime_start..][0..length];
try expect(@TypeOf(array_ptr_len) == *[length]i32);
// Using the address-of operator on a slice gives a single-item pointer,
// while using the `ptr` field gives a many-item pointer.
try expect(@TypeOf(slice.ptr) == [*]i32);