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Diffstat (limited to '')
-rw-r--r-- | js/public/WeakMapPtr.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/js/public/WeakMapPtr.h b/js/public/WeakMapPtr.h new file mode 100644 index 0000000000..f3fd5135d8 --- /dev/null +++ b/js/public/WeakMapPtr.h @@ -0,0 +1,48 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef js_WeakMapPtr_h +#define js_WeakMapPtr_h + +#include "jstypes.h" + +#include "js/TypeDecls.h" + +class JS_PUBLIC_API JSTracer; + +namespace JS { + +// A wrapper around the internal C++ representation of SpiderMonkey WeakMaps, +// usable outside the engine. +// +// The supported template specializations are enumerated in gc/WeakMapPtr.cpp. +// If you want to use this class for a different key/value combination, add it +// to the list and the compiler will generate the relevant machinery. +template <typename K, typename V> +class JS_PUBLIC_API WeakMapPtr { + public: + WeakMapPtr() : ptr(nullptr) {} + bool init(JSContext* cx); + bool initialized() { return ptr != nullptr; } + void destroy(); + virtual ~WeakMapPtr() { MOZ_ASSERT(!initialized()); } + void trace(JSTracer* trc); + + V lookup(const K& key); + bool put(JSContext* cx, const K& key, const V& value); + V removeValue(const K& key); + + private: + void* ptr; + + // WeakMapPtr is neither copyable nor assignable. + WeakMapPtr(const WeakMapPtr& wmp) = delete; + WeakMapPtr& operator=(const WeakMapPtr& wmp) = delete; +}; + +} /* namespace JS */ + +#endif /* js_WeakMapPtr_h */ |