A unique_ptr is also known as std::unique_ptr. Before C++11 it was boost::unique_ptr, but became a part of STD library in C++11 and is now called std::unique_ptr.
A scoped_ptr is generally known as boost::scoped_ptr, and is from the “ancient” ages before C++11 came along with the <memory> header with std::unique_ptr (and std::shared_ptr). Note that there is NO such thing as std::scoped_ptr! Only boost::scoped_ptr and std::unique_ptr. Generally, its std::unique_ptr you should use.
If you’ve been using boost, and have any
scoped_ptr lying around, you can (almost always) safely replace them with
std::unique_ptr. There are a few subtle differences between scoped_ptr and unique_ptr, but they are mostly an artifact on how “old” they are.
Related: Memory leak with scoped_ptr
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