Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/PassOwnPtr.h

-/*
- * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
- */
-
-#ifndef WTF_PassOwnPtr_h
-#define WTF_PassOwnPtr_h
-
-#include <wtf/Assertions.h>
-#include <wtf/NullPtr.h>
-#include <wtf/OwnPtrCommon.h>
-#include <wtf/TypeTraits.h>
-
-namespace WTF {
-
-    // Unlike most of our smart pointers, PassOwnPtr can take either the pointer type or the pointed-to type.
-
-    template<typename T> class OwnPtr;
-    template<typename T> class PassOwnPtr;
-    template<typename T> PassOwnPtr<T> adoptPtr(T*);
-
-    template<typename T> class PassOwnPtr {
-    public:
-        typedef typename RemovePointer<T>::Type ValueType;
-        typedef ValueType* PtrType;
-
-        PassOwnPtr() : m_ptr(0) { }
-        PassOwnPtr(std::nullptr_t) : m_ptr(0) { }
-
-        // It somewhat breaks the type system to allow transfer of ownership out of
-        // a const PassOwnPtr. However, it makes it much easier to work with PassOwnPtr
-        // temporaries, and we don't have a need to use real const PassOwnPtrs anyway.
-        PassOwnPtr(const PassOwnPtr& o) : m_ptr(o.leakPtr()) { }
-        template<typename U> PassOwnPtr(const PassOwnPtr<U>& o) : m_ptr(o.leakPtr()) { }
-
-        ~PassOwnPtr() { deleteOwnedPtr(m_ptr); }
-
-        PtrType get() const { return m_ptr; }
-
-        PtrType leakPtr() const WARN_UNUSED_RETURN;
-
-        ValueType& operator*() const { ASSERT(m_ptr); return *m_ptr; }
-        PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
-
-        bool operator!() const { return !m_ptr; }
-
-        // This conversion operator allows implicit conversion to bool but not to other integer types.
-        typedef PtrType PassOwnPtr::*UnspecifiedBoolType;
-        operator UnspecifiedBoolType() const { return m_ptr ? &PassOwnPtr::m_ptr : 0; }
-
-        PassOwnPtr& operator=(const PassOwnPtr&) { COMPILE_ASSERT(!sizeof(T*), PassOwnPtr_should_never_be_assigned_to); return *this; }
-
-        template<typename U> friend PassOwnPtr<U> adoptPtr(U*);
-
-    private:
-        explicit PassOwnPtr(PtrType ptr) : m_ptr(ptr) { }
-
-        // We should never have two OwnPtrs for the same underlying object (otherwise we'll get
-        // double-destruction), so these equality operators should never be needed.
-        template<typename U> bool operator==(const PassOwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
-        template<typename U> bool operator!=(const PassOwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
-        template<typename U> bool operator==(const OwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
-        template<typename U> bool operator!=(const OwnPtr<U>&) { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
-
-        mutable PtrType m_ptr;
-    };
-
-    template<typename T> inline typename PassOwnPtr<T>::PtrType PassOwnPtr<T>::leakPtr() const
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = 0;
-        return ptr;
-    }
-
-    template<typename T, typename U> inline bool operator==(const PassOwnPtr<T>& a, const PassOwnPtr<U>& b) 
-    {
-        return a.get() == b.get(); 
-    }
-
-    template<typename T, typename U> inline bool operator==(const PassOwnPtr<T>& a, const OwnPtr<U>& b) 
-    {
-        return a.get() == b.get(); 
-    }
-    
-    template<typename T, typename U> inline bool operator==(const OwnPtr<T>& a, const PassOwnPtr<U>& b) 
-    {
-        return a.get() == b.get(); 
-    }
-    
-    template<typename T, typename U> inline bool operator==(const PassOwnPtr<T>& a, U* b) 
-    {
-        return a.get() == b; 
-    }
-    
-    template<typename T, typename U> inline bool operator==(T* a, const PassOwnPtr<U>& b) 
-    {
-        return a == b.get(); 
-    }
-    
-    template<typename T, typename U> inline bool operator!=(const PassOwnPtr<T>& a, const PassOwnPtr<U>& b) 
-    {
-        return a.get() != b.get(); 
-    }
-    
-    template<typename T, typename U> inline bool operator!=(const PassOwnPtr<T>& a, const OwnPtr<U>& b) 
-    {
-        return a.get() != b.get(); 
-    }
-    
-    template<typename T, typename U> inline bool operator!=(const OwnPtr<T>& a, const PassOwnPtr<U>& b) 
-    {
-        return a.get() != b.get(); 
-    }
-    
-    template<typename T, typename U> inline bool operator!=(const PassOwnPtr<T>& a, U* b)
-    {
-        return a.get() != b; 
-    }
-    
-    template<typename T, typename U> inline bool operator!=(T* a, const PassOwnPtr<U>& b) 
-    {
-        return a != b.get(); 
-    }
-
-    template<typename T> inline PassOwnPtr<T> adoptPtr(T* ptr)
-    {
-        return PassOwnPtr<T>(ptr);
-    }
-
-    template<typename T, typename U> inline PassOwnPtr<T> static_pointer_cast(const PassOwnPtr<U>& p) 
-    {
-        return adoptPtr(static_cast<T*>(p.leakPtr()));
-    }
-
-    template<typename T, typename U> inline PassOwnPtr<T> const_pointer_cast(const PassOwnPtr<U>& p) 
-    {
-        return adoptPtr(const_cast<T*>(p.leakPtr()));
-    }
-
-    template<typename T> inline T* getPtr(const PassOwnPtr<T>& p)
-    {
-        return p.get();
-    }
-
-} // namespace WTF
-
-using WTF::PassOwnPtr;
-using WTF::adoptPtr;
-using WTF::const_pointer_cast;
-using WTF::static_pointer_cast;
-
-#endif // WTF_PassOwnPtr_h