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Attributes | Documentation

docs.swift.org · 92 words · saved by 1 readers

There are two kinds of attributes in Swift — those that apply to declarations and those that apply to types. An attribute provides additional information about the declaration or type. For example, the discardableResult attribute on a function declaration indicates that, although the function returns a value, the compiler shouldn’t generate a warning if the return value is unused. You specify an attribute by writing the @ symbol followed by the attribute’s name and any arguments that the attribute accepts: Some declaration attributes accept arguments that specify more information about the attribute and how it applies to a particular declaration. These attribute arguments are enclosed in parentheses, and their format is defined by the attribute they belong to. Attached macros and property wrappers also use attribute syntax. For information about how macros expand, see Macro-Expansion Expression. For information about property wrappers, see propertyWrapper. You can apply a declaration a

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