CODEWITHSUNDEEP
c++unique-ptr
아싸아
아싸아

Reputation: 1

C++/ I have a question about the 'new' method of 'unique_ptr'

class Manager {
private:
    //char* buff_;
    int buff_size_;
    int* ref_;
    unique_ptr<char> buff_;

public:
    Manager() {
        buff_size_ = 1;
        buff_ = nullptr;
        ref_ = new int;
        *ref_ = 1;
    }
    Manager(const char* s) {
        buff_size_ = strlen(s);
        buff_ = new char[buff_size_ + 1]; //error E0349 no operator = matches these operands
        //strcpy(buff_, s);
        ref_ = new int;
        *ref_ = 1;
    }
}

I want to replace char* with unique_ptr.

How can I write new in Manager(const char*s){}?

Upvotes: 0

Views: 97

Answers (1)

Remy Lebeau
Remy Lebeau

Reputation: 596256

First off, since your dynamic char[] data is being allocated with new[], you need to declare buff_ as unique_ptr<char[]> instead, so that it will use delete[] and not delete when freeing the memory.

The assignment operator= for std::unique_ptr fails in your code because it does not accept a raw pointer, only another std::unique_ptr object, or nullptr.

Try one of these instead:

buff_.reset(new char[buff_size_ + 1]);

buff_ = std::unique_ptr<char[]>(new char[buff_size_ + 1]);

// C++14 and later only
buff_ = std::make_unique<char[]>(buff_size_ + 1);

As for strcpy(), you can call it with std::unique_ptr like this:

strcpy(buff_.get(), s);

Upvotes: 3

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