二进制&#39;=&#39;：未找到采用&#39;std :: unique_ptr类型的右侧操作数的运算符 <char [],std::default_delete<_Ty> &gt;&#39;

Question

I have this check and when I'm trying to get the username, it says there is no acceptable conversion from Unique_ptr to CString.

Here is my code:

if (tsvn_creds.size() == 1)
    {
        std::map<CStringA,Creds>::iterator it = tsvn_creds.begin();
        if (tsvn_creds.find(it->first) != tsvn_creds.end())
        {
            Creds cr = tsvn_creds[it->first];
            user_name = cr.GetUsername();
        }
    }

Where GetUsername is:

std::unique_ptr<char[]> GetUsername() { return CStringUtils::Decrypt(username); }

CString user_name = NULL;

I need user_name as CString because at some point I need to append it to a CString message.

What's wrong with the way I have it setup above?

Here is the error I get:

Error   C2679   binary '=': no operator found which takes a right-hand operand of type 'std::unique_ptr<char [],std::default_delete<_Ty>>' (or there is no acceptable conversion)

EDIT:

I tried this solution as told in the comments:

user_name = *(cr.GetUsername());

but I get the error "illegal indirection"

Answer 1

The root of your problem is probably the CString type; the error message you get is saying that the implementer(s) of CString didn't define an operator= that assigns a CString object from a unique_ptr<char[]> .

Based on some quick Googling, I'm guessing your CString type is this one because it's from a Microsoft library and you say you're using WinForms. According to the documentation, you can only assign a CString from a raw pointer to a char array, that is, const unsigned char* . So to assign the result of GetUsername() to your CString user_name , you need to get the underlying raw pointer from the unique_ptr :

user_name = cr.GetUsername().get()