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48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
//===--- RequirementKind.h - Swift RequirementKind AST ---------*- C++ -*-===//
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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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//
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// This file defines the RequirementKind enum.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_REQUIREMENTKIND_H
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#define SWIFT_AST_REQUIREMENTKIND_H
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namespace swift {
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/// Describes the kind of a requirement that occurs within a requirements
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/// clause.
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enum class RequirementKind : unsigned {
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/// A conformance requirement T : P, where T is a type that depends
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/// on a generic parameter and P is a protocol to which T must conform.
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Conformance,
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/// A superclass requirement T : C, where T is a type that depends
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/// on a generic parameter and C is a concrete class type which T must
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/// equal or be a subclass of.
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Superclass,
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/// A same-type requirement T == U, where T and U are types that shall be
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/// equivalent.
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SameType,
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/// A layout bound T : L, where T is a type that depends on a generic
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/// parameter and L is some layout specification that should bound T.
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Layout,
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/// A same-shape requirement shape(T) == shape(U), where T and U are pack
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/// parameters.
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SameShape,
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// Note: there is code that packs this enum in a 3-bit bitfield. Audit users
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// when adding enumerators.
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LAST_KIND=SameShape
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};
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} // namespace swift
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#endif
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