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| -rw-r--r-- | doc/langref.html.in | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/doc/langref.html.in b/doc/langref.html.in index 05bdfbd043..744d33f85c 100644 --- a/doc/langref.html.in +++ b/doc/langref.html.in @@ -2863,6 +2863,37 @@ fn dump(args: anytype) void { expect(args.s[1] == 'i'); } {#code_end#} + <p> + Anonymous structs can be created without specifying field names, and are referred to as "tuples". + </p> + <p> + The fields are implicitly named using numbers starting from 0. Because their names are integers, + the {#syntax#}@"0"{#endsyntax#} syntax must be used to access them. Names inside {#syntax#}@""{#endsyntax#} are always recognised as identifiers. + </p> + <p> + Like arrays, tuples have a .len field, can be indexed and work with the ++ and ** operators. They can also be iterated over with {#link|inline for#}. + </p> + {#code_begin|test|tuple#} +const std = @import("std"); +const expect = std.testing.expect; + +test "tuple" { + const values = .{ + @as(u32, 1234), + @as(f64, 12.34), + true, + "hi", + } ++ .{false} ** 2; + expect(values[0] == 1234); + expect(values[4] == false); + inline for (values) |v, i| { + if (i != 2) continue; + expect(v); + } + expect(values.len == 6); + expect(values.@"3"[0] == 'h'); +} + {#code_end#} {#header_close#} {#see_also|comptime|@fieldParentPtr#} {#header_close#} |