Merge "Exporting C++ headers from system/core" am: 812b7d5d52 am: f484dd3401 am: a252f11da3

am: 5a8f555e49

Change-Id: Id449aadc3b9e6e263d351ce031b1f7f7bb4672b8

1 files changed, 245 insertions, 0 deletions

diff --git a/libutils/include/utils/StrongPointer.h b/libutils/include/utils/StrongPointer.h
new file mode 100644
index 000000000..294e6b6f4
--- /dev/null
+++ b/libutils/include/utils/StrongPointer.h
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2005 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_STRONG_POINTER_H
+#define ANDROID_STRONG_POINTER_H
+
+#include <cutils/atomic.h>
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <stdlib.h>
+
+// ---------------------------------------------------------------------------
+namespace android {
+
+template<typename T> class wp;
+
+// ---------------------------------------------------------------------------
+
+#define COMPARE(_op_)                                           \
+inline bool operator _op_ (const sp<T>& o) const {              \
+    return m_ptr _op_ o.m_ptr;                                  \
+}                                                               \
+inline bool operator _op_ (const T* o) const {                  \
+    return m_ptr _op_ o;                                        \
+}                                                               \
+template<typename U>                                            \
+inline bool operator _op_ (const sp<U>& o) const {              \
+    return m_ptr _op_ o.m_ptr;                                  \
+}                                                               \
+template<typename U>                                            \
+inline bool operator _op_ (const U* o) const {                  \
+    return m_ptr _op_ o;                                        \
+}                                                               \
+inline bool operator _op_ (const wp<T>& o) const {              \
+    return m_ptr _op_ o.m_ptr;                                  \
+}                                                               \
+template<typename U>                                            \
+inline bool operator _op_ (const wp<U>& o) const {              \
+    return m_ptr _op_ o.m_ptr;                                  \
+}
+
+// ---------------------------------------------------------------------------
+
+template<typename T>
+class sp {
+public:
+    inline sp() : m_ptr(0) { }
+
+    sp(T* other);  // NOLINT(implicit)
+    sp(const sp<T>& other);
+    sp(sp<T>&& other);
+    template<typename U> sp(U* other);  // NOLINT(implicit)
+    template<typename U> sp(const sp<U>& other);  // NOLINT(implicit)
+    template<typename U> sp(sp<U>&& other);  // NOLINT(implicit)
+
+    ~sp();
+
+    // Assignment
+
+    sp& operator = (T* other);
+    sp& operator = (const sp<T>& other);
+    sp& operator = (sp<T>&& other);
+
+    template<typename U> sp& operator = (const sp<U>& other);
+    template<typename U> sp& operator = (sp<U>&& other);
+    template<typename U> sp& operator = (U* other);
+
+    //! Special optimization for use by ProcessState (and nobody else).
+    void force_set(T* other);
+
+    // Reset
+
+    void clear();
+
+    // Accessors
+
+    inline  T&      operator* () const  { return *m_ptr; }
+    inline  T*      operator-> () const { return m_ptr;  }
+    inline  T*      get() const         { return m_ptr; }
+
+    // Operators
+
+    COMPARE(==)
+    COMPARE(!=)
+    COMPARE(>)
+    COMPARE(<)
+    COMPARE(<=)
+    COMPARE(>=)
+
+private:    
+    template<typename Y> friend class sp;
+    template<typename Y> friend class wp;
+    void set_pointer(T* ptr);
+    T* m_ptr;
+};
+
+#undef COMPARE
+
+// ---------------------------------------------------------------------------
+// No user serviceable parts below here.
+
+template<typename T>
+sp<T>::sp(T* other)
+        : m_ptr(other) {
+    if (other)
+        other->incStrong(this);
+}
+
+template<typename T>
+sp<T>::sp(const sp<T>& other)
+        : m_ptr(other.m_ptr) {
+    if (m_ptr)
+        m_ptr->incStrong(this);
+}
+
+template<typename T>
+sp<T>::sp(sp<T>&& other)
+        : m_ptr(other.m_ptr) {
+    other.m_ptr = nullptr;
+}
+
+template<typename T> template<typename U>
+sp<T>::sp(U* other)
+        : m_ptr(other) {
+    if (other)
+        (static_cast<T*>(other))->incStrong(this);
+}
+
+template<typename T> template<typename U>
+sp<T>::sp(const sp<U>& other)
+        : m_ptr(other.m_ptr) {
+    if (m_ptr)
+        m_ptr->incStrong(this);
+}
+
+template<typename T> template<typename U>
+sp<T>::sp(sp<U>&& other)
+        : m_ptr(other.m_ptr) {
+    other.m_ptr = nullptr;
+}
+
+template<typename T>
+sp<T>::~sp() {
+    if (m_ptr)
+        m_ptr->decStrong(this);
+}
+
+template<typename T>
+sp<T>& sp<T>::operator =(const sp<T>& other) {
+    T* otherPtr(other.m_ptr);
+    if (otherPtr)
+        otherPtr->incStrong(this);
+    if (m_ptr)
+        m_ptr->decStrong(this);
+    m_ptr = otherPtr;
+    return *this;
+}
+
+template<typename T>
+sp<T>& sp<T>::operator =(sp<T>&& other) {
+    if (m_ptr)
+        m_ptr->decStrong(this);
+    m_ptr = other.m_ptr;
+    other.m_ptr = nullptr;
+    return *this;
+}
+
+template<typename T>
+sp<T>& sp<T>::operator =(T* other) {
+    if (other)
+        other->incStrong(this);
+    if (m_ptr)
+        m_ptr->decStrong(this);
+    m_ptr = other;
+    return *this;
+}
+
+template<typename T> template<typename U>
+sp<T>& sp<T>::operator =(const sp<U>& other) {
+    T* otherPtr(other.m_ptr);
+    if (otherPtr)
+        otherPtr->incStrong(this);
+    if (m_ptr)
+        m_ptr->decStrong(this);
+    m_ptr = otherPtr;
+    return *this;
+}
+
+template<typename T> template<typename U>
+sp<T>& sp<T>::operator =(sp<U>&& other) {
+    if (m_ptr)
+        m_ptr->decStrong(this);
+    m_ptr = other.m_ptr;
+    other.m_ptr = nullptr;
+    return *this;
+}
+
+template<typename T> template<typename U>
+sp<T>& sp<T>::operator =(U* other) {
+    if (other)
+        (static_cast<T*>(other))->incStrong(this);
+    if (m_ptr)
+        m_ptr->decStrong(this);
+    m_ptr = other;
+    return *this;
+}
+
+template<typename T>
+void sp<T>::force_set(T* other) {
+    other->forceIncStrong(this);
+    m_ptr = other;
+}
+
+template<typename T>
+void sp<T>::clear() {
+    if (m_ptr) {
+        m_ptr->decStrong(this);
+        m_ptr = 0;
+    }
+}
+
+template<typename T>
+void sp<T>::set_pointer(T* ptr) {
+    m_ptr = ptr;
+}
+
+}; // namespace android
+
+// ---------------------------------------------------------------------------
+
+#endif // ANDROID_STRONG_POINTER_H