Design magic?

Question

C++ / C#

struct WorkExample
{
    WorkExample (const int &number ){}
};

WorkExample wOne(1); // ok
WorkExample wTwo=1; // ok

struct Example
{
    Example ( const std::string &line ){}
};

Example one("line"); // ok
Example two="line"; // error

Why is it not possible to call the Example constructor immediately after the declaration with = ?
If you replace const std::string &linewith const char *const line, everything works.

Answer 1

The compiler does not do more than one conversion
If we replace with Example two=std::string("line");, then everything will work

Example two="line";  ->  Example two("line"); //Нет конструктора, который принимает const char*