Boost C++ Application Development Cookbook - Second Edition

How to do it...

Those readers who use C++11, already know about the move-only classes (like std::unique_ptr or std::thread). Using such an approach, we can make a move-only descriptor_owner class:

class descriptor_owner1 {    void* descriptor_;public:    descriptor_owner1()        : descriptor_(nullptr)    {}    explicit descriptor_owner1(const char* param);    descriptor_owner1(descriptor_owner1&& param)        : descriptor_(param.descriptor_)    {        param.descriptor_ = nullptr;    }    descriptor_owner1& operator=(descriptor_owner1&& param) {        descriptor_owner1 tmp(std::move(param));        std::swap(descriptor_, tmp.descriptor_);        return *this;    }    void clear() {        free(descriptor_);        descriptor_ = nullptr;    }    bool empty() const {        return !descriptor_;    }    ~descriptor_owner1() {        clear();    }}; ...