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64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
//===--- ScopedTracking.h - Utilities for scoped tracking -------*- 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 some miscellaneous utilities that are useful when
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// working with tracked values that can be saved and restored in a scoped
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// fashion.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_SCOPEDTRACKING_H
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#define SWIFT_BASIC_SCOPEDTRACKING_H
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namespace llvm {
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template <class K, class V, class T, class A>
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class ScopedHashTable;
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template <class K, class V, class T, class A>
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class ScopedHashTableScope;
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}
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namespace swift {
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/// Must declare a nested type scope_type which can be initialized
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/// with an l-value reference to the tracker type.
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template <class Tracker>
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struct ScopedTrackingTraits;
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template <class K, class V, class T, class A>
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struct ScopedTrackingTraits<llvm::ScopedHashTable<K,V,T,A>> {
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using scope_type = llvm::ScopedHashTableScope<K,V,T,A>;
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};
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/// A class which stores scopes for multiple trackers. Can be
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/// initialized with a pack of l-value references to the trackers.
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template <class... Trackers>
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class TrackingScopes;
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template <>
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class TrackingScopes<> {
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public:
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TrackingScopes() {}
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};
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template <class Tracker, class... OtherTrackers>
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class TrackingScopes<Tracker, OtherTrackers...> {
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typename ScopedTrackingTraits<Tracker>::scope_type Scope;
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TrackingScopes<OtherTrackers...> OtherScopes;
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public:
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TrackingScopes(Tracker &tracker, OtherTrackers &...otherTrackers)
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: Scope(tracker), OtherScopes(otherTrackers...) {}
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};
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} // end namespace swift
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#endif
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