Boost C++ Application Development Cookbook - Second Edition

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The scoped_array<> class has same guarantees and design as scoped_ptr<>. It has neither additional memory allocations nor virtual function's call. It cannot be copied and also is not a part of C++11. std::unique_ptr<T[]> is part of the C++11 and has the same guarantees and performance as the boost::movelib::unique_ptr<T[]> class.

Actually, make_unique<char[]>(1024) is not the same as new char[1024], because the first one does value initialization and the second one does the default initialization. The equivalent function for default-initialization is boost::movelib::make_unique_definit.

Note that Boost version could also work on pre-C++11 compilers and even emulates rvalues on them, making boost::movelib::unique_ptr a move ...