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docs: Clarify that @field can work on declarations

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Ryan Liptak 2021-02-01 09:11:06 -08:00 committed by Andrew Kelley
parent 1517ed0a5e
commit 5e81b048a0
1 changed files with 14 additions and 3 deletions
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17
doc/langref.html.in
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@ -7533,19 +7533,21 @@ export fn @"A function name that is a complete sentence."() void {}
{#header_open|@field#}
<pre>{#syntax#}@field(lhs: anytype, comptime field_name: []const u8) (field){#endsyntax#}</pre>
<p>Performs field access by a compile-time string.
<p>Performs field access by a compile-time string. Works on both fields and declarations.
</p>
{#code_begin|test#}
const std = @import("std");
const Point = struct {
x: u32,
y: u32
y: u32,
pub var z: u32 = 1;
};
test "field access by string" {
const expect = std.testing.expect;
var p = Point {.x = 0, .y = 0};
var p = Point{ .x = 0, .y = 0 };
@field(p, "x") = 4;
@field(p, "y") = @field(p, "x") + 1;
@ -7553,6 +7555,15 @@ test "field access by string" {
expect(@field(p, "x") == 4);
expect(@field(p, "y") == 5);
}
test "decl access by string" {
const expect = std.testing.expect;
expect(@field(Point, "z") == 1);
@field(Point, "z") = 2;
expect(@field(Point, "z") == 2);
}
{#code_end#}
{#header_close#}