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4.9 Attributes

  • Syntax: @name or @name(arguments) before a declaration, field, parameter or rpc. The order of attributes does not matter.
  • Attribute arguments are comptime expressions: literals, consts, calls of comptime functions. Therefore @timeout(STD_TIMEOUT) is allowed and recommended (part IV).
  • Some attributes accept a lambda over the parameters (@idempotent(key: r => r.cartId)) or a field path (@owner(.userId)); this is stated in the description of the attribute.
  • A user attribute: attr Audit { level: Level = Level.Info } + a comptime handler (§15.4).

Built-in attributes: @derive @sealed @explicit @open @error @reflect @since @removed @tag @v @codec @repr @table @pk @auto @index @shard @owner @visible @encrypted @public @allow @timeout @retry @deadline @cache @ratelimit @idempotent @resumable @trace @audit @idle @near @pinned @test_only @deprecated @inline @cold. The semantics of each is in the section where it is introduced; the summary table is in part II.

deprecated

See also

Source: docs/spec/oxl-standard.en.md