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fml
memory
weak_ptr_internal.h
Go to the documentation of this file.
1
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_FML_MEMORY_WEAK_PTR_INTERNAL_H_
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#define FLUTTER_FML_MEMORY_WEAK_PTR_INTERNAL_H_
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#include "flutter/fml/macros.h"
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#include "flutter/fml/memory/ref_counted.h"
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namespace
fml
{
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namespace
internal {
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// |WeakPtr<T>|s have a reference to a |WeakPtrFlag| to determine whether they
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// are valid (non-null) or not. We do not store a |T*| in this object since
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// there may also be |WeakPtr<U>|s to the same object, where |U| is a superclass
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// of |T|.
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//
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// This class in not thread-safe, though references may be released on any
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// thread (allowing weak pointers to be destroyed/reset/reassigned on any
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// thread).
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class
WeakPtrFlag
:
public
fml::RefCountedThreadSafe
<WeakPtrFlag> {
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public
:
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WeakPtrFlag
();
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~WeakPtrFlag
();
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bool
is_valid
()
const
{
return
is_valid_; }
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void
Invalidate
();
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private
:
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bool
is_valid_ =
false
;
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FML_DISALLOW_COPY_AND_ASSIGN(
WeakPtrFlag
);
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};
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}
// namespace internal
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}
// namespace fml
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#endif
// FLUTTER_FML_MEMORY_WEAK_PTR_INTERNAL_H_
fml::RefCountedThreadSafe
Definition:
ref_counted.h:63
fml::internal::WeakPtrFlag
Definition:
weak_ptr_internal.h:22
fml::internal::WeakPtrFlag::is_valid
bool is_valid() const
Definition:
weak_ptr_internal.h:28
fml::internal::WeakPtrFlag::Invalidate
void Invalidate()
Definition:
weak_ptr_internal.cc:19
fml::internal::WeakPtrFlag::WeakPtrFlag
WeakPtrFlag()
Definition:
weak_ptr_internal.cc:12
fml::internal::WeakPtrFlag::~WeakPtrFlag
~WeakPtrFlag()
Definition:
weak_ptr_internal.cc:14
fml
Definition:
ascii_trie.cc:9
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