automatic conversion from string to myclass

Question

I have defined a class

class Version
{
public:
        Version(std::string versionStr)
        {
            //do something
        }
}

I want to be able to use it as follow

void foo(Version v1) {//do somthing};
void main()
{
    foo("test");
}

I would like that v1 becomes an object as if I have done:

void main()
{
    Version v1("test");
    foo(v1);
}    

is that possible?

Answer 1

The code you have has too many levels of implicit construction. "string literal" is of type const char [] and not std::string. Only one level of implicit construction occurs automatically. Try adding a constructor that takes const char * instead:

class Version {
    // ...
    Version(const char *_vstr) : versionStr(_vstr) {}
    // ...
}

Live demo.