mirror of https://github.com/OpenTTD/OpenTTD.git
98 lines
1.8 KiB
C++
98 lines
1.8 KiB
C++
/* $Id$ */
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/** @file autoptr.hpp */
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#ifndef AUTOPTR_HPP
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#define AUTOPTR_HPP
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/** AutoPtrT - kind of smart pointer that ensures the owned object gets
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* deleted when its pointer goes out of scope.
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* It is non-invasive smart pointer (no reference counter).
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* When copied, the copy takes ownership of underlying object
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* and original becomes NULL!
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* Can be used also for polymorphic data types (interfaces).
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*/
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template <class T>
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class AutoPtrT {
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public:
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typedef T obj_t;
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protected:
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mutable T* m_p; ///< points to the data
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public:
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FORCEINLINE AutoPtrT()
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: m_p(NULL)
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{};
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FORCEINLINE AutoPtrT(const AutoPtrT<T>& src)
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: m_p(src.m_p)
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{
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if (m_p != NULL) src.m_p = NULL;
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};
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FORCEINLINE AutoPtrT(T *p)
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: m_p(p)
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{}
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FORCEINLINE ~AutoPtrT()
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{
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if (m_p != NULL) {
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delete m_p;
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m_p = NULL;
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}
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}
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/** give-up ownership and NULLify the raw pointer */
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FORCEINLINE T* Release()
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{
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T* p = m_p;
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m_p = NULL;
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return p;
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}
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/** raw-pointer cast operator (read only) */
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FORCEINLINE operator const T* () const
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{
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return m_p;
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}
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/** raw-pointer cast operator */
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FORCEINLINE operator T* ()
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{
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return m_p;
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}
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/** dereference operator (read only) */
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FORCEINLINE const T* operator -> () const
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{
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assert(m_p != NULL);
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return m_p;
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}
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/** dereference operator (read / write) */
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FORCEINLINE T* operator -> ()
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{
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assert(m_p != NULL);
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return m_p;
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}
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/** assignment operator */
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FORCEINLINE AutoPtrT& operator = (const AutoPtrT& src)
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{
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m_p = src.m_p;
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if (m_p != NULL) src.m_p = NULL;
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return *this;
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}
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/** forwarding 'lower than' operator to the underlaying items */
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FORCEINLINE bool operator < (const AutoPtrT& other) const
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{
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assert(m_p != NULL);
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assert(other.m_p != NULL);
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return (*m_p) < (*other.m_p);
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}
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};
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#endif /* AUTOPTR_HPP */
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