Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/OwnPtr.h

-/*
- *  Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
- *
- *  This library is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU Library General Public
- *  License as published by the Free Software Foundation; either
- *  version 2 of the License, or (at your option) any later version.
- *
- *  This library is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  Library General Public License for more details.
- *
- *  You should have received a copy of the GNU Library General Public License
- *  along with this library; see the file COPYING.LIB.  If not, write to
- *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- *  Boston, MA 02110-1301, USA.
- *
- */
-
-#ifndef WTF_OwnPtr_h
-#define WTF_OwnPtr_h
-
-#include <wtf/Assertions.h>
-#include <wtf/Noncopyable.h>
-#include <wtf/NullPtr.h>
-#include <wtf/OwnPtrCommon.h>
-#include <wtf/TypeTraits.h>
-#include <algorithm>
-#include <memory>
-
-namespace WTF {
-
-    // Unlike most of our smart pointers, OwnPtr can take either the pointer type or the pointed-to type.
-
-    template<typename T> class PassOwnPtr;
-    template<typename T> PassOwnPtr<T> adoptPtr(T*);
-
-    template<typename T> class OwnPtr {
-#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
-        // If rvalue references are not supported, the copy constructor is
-        // public so OwnPtr cannot be marked noncopyable. See note below.
-        WTF_MAKE_NONCOPYABLE(OwnPtr);
-#endif
-    public:
-        typedef typename RemovePointer<T>::Type ValueType;
-        typedef ValueType* PtrType;
-
-        OwnPtr() : m_ptr(0) { }
-        OwnPtr(std::nullptr_t) : m_ptr(0) { }
-
-        // See comment in PassOwnPtr.h for why this takes a const reference.
-        template<typename U> OwnPtr(const PassOwnPtr<U>& o);
-
-#if !COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
-        // This copy constructor is used implicitly by gcc when it generates
-        // transients for assigning a PassOwnPtr<T> object to a stack-allocated
-        // OwnPtr<T> object. It should never be called explicitly and gcc
-        // should optimize away the constructor when generating code.
-        OwnPtr(const OwnPtr<ValueType>&);
-#endif
-
-        ~OwnPtr() { deleteOwnedPtr(m_ptr); }
-
-        PtrType get() const { return m_ptr; }
-
-        void clear();
-        PassOwnPtr<T> release();
-        PtrType leakPtr() 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 OwnPtr::*UnspecifiedBoolType;
-        operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtr::m_ptr : 0; }
-
-        OwnPtr& operator=(const PassOwnPtr<T>&);
-        OwnPtr& operator=(std::nullptr_t) { clear(); return *this; }
-        template<typename U> OwnPtr& operator=(const PassOwnPtr<U>&);
-
-#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
-        OwnPtr(OwnPtr&&);
-        template<typename U> OwnPtr(OwnPtr<U>&&);
-
-        OwnPtr& operator=(OwnPtr&&);
-        template<typename U> OwnPtr& operator=(OwnPtr<U>&&);
-#endif
-
-        void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
-
-    private:
-#if !COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
-        // If rvalue references are supported, noncopyable takes care of this.
-        OwnPtr& operator=(const OwnPtr&);
-#endif
-
-        // 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 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; }
-        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; }
-
-        PtrType m_ptr;
-    };
-
-    template<typename T> template<typename U> inline OwnPtr<T>::OwnPtr(const PassOwnPtr<U>& o)
-        : m_ptr(o.leakPtr())
-    {
-    }
-
-    template<typename T> inline void OwnPtr<T>::clear()
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = 0;
-        deleteOwnedPtr(ptr);
-    }
-
-    template<typename T> inline PassOwnPtr<T> OwnPtr<T>::release()
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = 0;
-        return adoptPtr(ptr);
-    }
-
-    template<typename T> inline typename OwnPtr<T>::PtrType OwnPtr<T>::leakPtr()
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = 0;
-        return ptr;
-    }
-
-    template<typename T> inline OwnPtr<T>& OwnPtr<T>::operator=(const PassOwnPtr<T>& o)
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = o.leakPtr();
-        ASSERT(!ptr || m_ptr != ptr);
-        deleteOwnedPtr(ptr);
-        return *this;
-    }
-
-    template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(const PassOwnPtr<U>& o)
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = o.leakPtr();
-        ASSERT(!ptr || m_ptr != ptr);
-        deleteOwnedPtr(ptr);
-        return *this;
-    }
-
-#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
-    template<typename T> inline OwnPtr<T>::OwnPtr(OwnPtr<T>&& o)
-        : m_ptr(o.leakPtr())
-    {
-    }
-
-    template<typename T> template<typename U> inline OwnPtr<T>::OwnPtr(OwnPtr<U>&& o)
-        : m_ptr(o.leakPtr())
-    {
-    }
-
-    template<typename T> inline OwnPtr<T>& OwnPtr<T>::operator=(OwnPtr<T>&& o)
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = o.leakPtr();
-        ASSERT(!ptr || m_ptr != ptr);
-        deleteOwnedPtr(ptr);
-
-        return *this;
-    }
-
-    template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(OwnPtr<U>&& o)
-    {
-        PtrType ptr = m_ptr;
-        m_ptr = o.leakPtr();
-        ASSERT(!ptr || m_ptr != ptr);
-        deleteOwnedPtr(ptr);
-
-        return *this;
-    }
-#endif
-
-    template<typename T> inline void swap(OwnPtr<T>& a, OwnPtr<T>& b)
-    {
-        a.swap(b);
-    }
-
-    template<typename T, typename U> inline bool operator==(const OwnPtr<T>& a, U* b)
-    {
-        return a.get() == b; 
-    }
-
-    template<typename T, typename U> inline bool operator==(T* a, const OwnPtr<U>& b) 
-    {
-        return a == b.get(); 
-    }
-
-    template<typename T, typename U> inline bool operator!=(const OwnPtr<T>& a, U* b)
-    {
-        return a.get() != b; 
-    }
-
-    template<typename T, typename U> inline bool operator!=(T* a, const OwnPtr<U>& b)
-    {
-        return a != b.get(); 
-    }
-
-    template<typename T> inline typename OwnPtr<T>::PtrType getPtr(const OwnPtr<T>& p)
-    {
-        return p.get();
-    }
-
-} // namespace WTF
-
-using WTF::OwnPtr;
-
-#endif // WTF_OwnPtr_h