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Add getSentinel helper to Pointer and Array builtin.Types

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xdBronch 2024-11-15 13:41:53 -05:00
parent bfcf18c5a7
commit dbba600c6d
1 changed files with 16 additions and 0 deletions
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16
lib/std/builtin.zig
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@ -607,6 +607,7 @@ pub const Type = union(enum) {
/// The type of the sentinel is the element type of the pointer, which is
/// the value of the `child` field in this struct. However there is no way
/// to refer to that type here, so we use pointer to `anyopaque`.
/// See `getSentinel` for an easier way to access this value.
sentinel: ?*const anyopaque,
/// This data structure is used by the Zig language code generation and
@ -617,6 +618,14 @@ pub const Type = union(enum) {
Slice,
C,
};
/// Returns the sentinel value casted to the child type
/// Asserts that `pointer.size` is `.Many` or `.Slice`
/// and that `pointer.sentinel` is non-null
pub fn getSentinel(pointer: Pointer) pointer.child {
std.debug.assert(pointer.size == .Many or pointer.size == .Slice);
return @as(*const pointer.child, @ptrCast(@alignCast(pointer.sentinel.?))).*;
}
};
/// This data structure is used by the Zig language code generation and
@ -628,7 +637,14 @@ pub const Type = union(enum) {
/// The type of the sentinel is the element type of the array, which is
/// the value of the `child` field in this struct. However there is no way
/// to refer to that type here, so we use pointer to `anyopaque`.
/// See `getSentinel` for an easier way to access this value.
sentinel: ?*const anyopaque,
/// Returns the sentinel value casted to the child type
/// Asserts that `array.sentinel` is non-null
pub fn getSentinel(array: Array) array.child {
return @as(*const array.child, @ptrCast(@alignCast(array.sentinel.?))).*;
}
};
/// This data structure is used by the Zig language code generation and