This means that the smart pointer is responsible for deleting the memory that the raw pointer specifies. After the smart pointer is initialized, it owns the raw pointer. } // song2 is deleted automatically here.Īs shown in the example, a smart pointer is a class template that you declare on the stack, and initialize by using a raw pointer that points to a heap-allocated object. Unique_ptr song2(new Song(L"Nothing on You", L"Bruno Mars")) Declare a smart pointer on stack and pass it the raw pointer. Song* pSong = new Song(L"Nothing on You", L"Bruno Mars") Using a raw pointer - not recommended. The following example compares a raw pointer declaration to a smart pointer declaration.
SMART PIXEL TUTORIAL CODE
In modern C++, raw pointers are only used in small code blocks of limited scope, loops, or helper functions where performance is critical and there is no chance of confusion about ownership. In most cases, when you initialize a raw pointer or resource handle to point to an actual resource, pass the pointer to a smart pointer immediately.
SMART PIXEL TUTORIAL FREE
In practical terms, the main principle of RAII is to give ownership of any heap-allocated resource-for example, dynamically-allocated memory or system object handles-to a stack-allocated object whose destructor contains the code to delete or free the resource and also any associated cleanup code. The main goal of this idiom is to ensure that resource acquisition occurs at the same time that the object is initialized, so that all resources for the object are created and made ready in one line of code. They are crucial to the RAII or Resource Acquisition Is Initialization programming idiom. Smart pointers are defined in the std namespace in the header file. In modern C++ programming, the Standard Library includes smart pointers, which are used to help ensure that programs are free of memory and resource leaks and are exception-safe.
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