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Clarify allowzero's interaction with optional pointers.

master
Nathan Michaels 2019-12-16 23:55:35 -05:00 committed by Andrew Kelley
parent 62c817420d
commit f389e5e61f
1 changed files with 4 additions and 2 deletions
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6
doc/langref.html.in
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@ -2133,8 +2133,10 @@ fn foo(bytes: []u8) u32 {
<p>
This pointer attribute allows a pointer to have address zero. This is only ever needed on the
freestanding OS target, where the address zero is mappable. If you want to represent null pointers, use
{#link|Optional Pointers#} instead. In this code example, if the pointer did not have the
{#syntax#}allowzero{#endsyntax#} attribute, this would be a {#link|Pointer Cast Invalid Null#} panic:
{#link|Optional Pointers#} instead. {#link|Optional Pointers#} with {#syntax#}allowzero{#endsyntax#}
are not the same size as pointers. In this code example, if the pointer
did not have the {#syntax#}allowzero{#endsyntax#} attribute, this would be a
{#link|Pointer Cast Invalid Null#} panic:
</p>
{#code_begin|test|allowzero#}
const std = @import("std");