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28 lines
1.0 KiB
Swift
28 lines
1.0 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#if hasAttribute(expression)
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/// Specifies the module and type name for an externally-defined macro, which
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/// must conform to the appropriate set of `Macro` protocols.
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///
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/// This macro can only be used to define other macros. For example:
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///
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/// macro stringify<T>(_ value: T) -> (T, String) =
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/// #externalMacro(module: "ExampleMacros", type :"StringifyMacro")
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///
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/// Use of this macro in any other context is an error.
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@expression
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public macro externalMacro<T>(module: String, type: String) -> T =
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Builtin.ExternalMacro
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#endif
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