无法push_back移动（NonCopyableWithConstField）到矢量

Question

I have a NonCopyable class (due to its unique_ptr field). I want to create a vector of NonCopyable elements but the following code wouldn't compile

    NonCopyable nc;
    vector<NonCopyable> vec;
    vec.push_back(move(nc));

Here's the definition of NonCopyable:

class NonCopyable final {
public:
    const std::unique_ptr<string> data;
};

The error message is Call to implicitly-deleted copy constructor of NonCopyable .

How can I add NonCopyable elements to my vector while being able to signal that the embedded data field is immutable?

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Update : my current solution is: (i) make data non-const; (ii) make it private; (iii) add a const function to expose data .

Answer 1

Your NonCopyable class does not have a move constructor. Define one.

The code shown should function correctly.