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Possible Duplicate: std::auto_ptr to std::unique_ptr What C++ Smart Pointer Implementations are available? Lets say I have this struct : struct bar { }; When I use auto_ptr like this: void foo() { auto_ptr<bar> myFirstBar = new bar; if( ) { auto_ptr<bar> mySecondBar = myFirstBar; } } then at auto_ptr<bar> mySecondBar = myFirstBar; C++ transfers the ownership from myFirstBar to mySecondBar and there is no compilation error. But when I use unique_ptr instead of auto_ptr I get a compiler error. Why C++ doesn't allow this? And what is the main differences between these two smart pointers? When I need to use what?
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