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Allocator/Random: document that comparing ptr may result in illegal behavior

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See #21756 and #17704
This commit is contained in:
Ryan Liptak
2025-01-31 02:04:02 -08:00
parent b46f9945a8
commit 4041cc06d5
2 changed files with 7 additions and 1 deletions
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3
lib/std/Random.zig
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@@ -29,6 +29,9 @@ pub const RomuTrio = @import("Random/RomuTrio.zig");
pub const SplitMix64 = @import("Random/SplitMix64.zig");
pub const ziggurat = @import("Random/ziggurat.zig");
/// Any comparison of this field may result in illegal behavior, since it may be set to
/// `undefined` in cases where the random implementation does not have any associated
/// state.
ptr: *anyopaque,
fillFn: *const fn (ptr: *anyopaque, buf: []u8) void,

5
lib/std/mem/Allocator.zig
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@@ -10,7 +10,10 @@ const builtin = @import("builtin");
pub const Error = error{OutOfMemory};
pub const Log2Align = math.Log2Int(usize);
// The type erased pointer to the allocator implementation
/// The type erased pointer to the allocator implementation.
/// Any comparison of this field may result in illegal behavior, since it may be set to
/// `undefined` in cases where the allocator implementation does not have any associated
/// state.
ptr: *anyopaque,
vtable: *const VTable,