authorgravatar for aleksey.kladov@gmail.comAlex Kladov <aleksey.kladov@gmail.com> 2024-06-28 13:32:56+01:00
committergravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2024-07-21 01:26:21-07:00
log82679297422d02039c992cc223f5cfbf6fcd8675
tree4e6a1a0204638b4cc67ae872731ad1a45c02848d
parentaa73bb6bc969ef053a8fab265da8bf28e024b2d2

langref: add example for errdefer |err| sytnax

2 files changed, 23 insertions(+), 0 deletions(-)

doc/langref.html.in+4
......@@ -2992,6 +2992,10 @@ fn createFoo(param: i32) !Foo {
29922992 the verbosity and cognitive overhead of trying to make sure every exit path
29932993 is covered. The deallocation code is always directly following the allocation code.
29942994 </p>
2995 <p>
2996 The {#syntax#}errdefer{#endsyntax#} statement can optionally capture the error:
2997 </p>
2998 {#code|test_errdefer_capture.zig#}
29952999 {#header_close#}
29963000 {#header_open|Common errdefer Slip-Ups#}
29973001 <p>
doc/langref/test_errdefer_capture.zig created+19
......@@ -0,0 +1,19 @@
1const std = @import("std");
2
3fn captureError(captured: *?anyerror) !void {
4 errdefer |err| {
5 captured.* = err;
6 }
7 return error.GeneralFailure;
8}
9
10test "errdefer capture" {
11 var captured: ?anyerror = null;
12
13 if (captureError(&captured)) unreachable else |err| {
14 try std.testing.expectEqual(error.GeneralFailure, captured.?);
15 try std.testing.expectEqual(error.GeneralFailure, err);
16 }
17}
18
19// test