error: none of the 2 overloads can convert parameter 1 from type 'char [7]'

[0609mao]

#include<iostre am>
#include<string >
using namespace std;
class Class1
{
public :
Class1(char* p){};

};

class Class2
{
public:
Class2(char* p){ };
};

void f(Class1&x){};
void f(Class2&x){};

void main()
{
f("string");
}

[weaknessforcats]

Both overloads of function f take a class object by reference. That means the overloads will work only if you have already created a
Class1 or Class2 object and use that object on the call to f.

By using a string on the call to f you need an overload that is not a reference. That will cause the object to be created by the compiler and then passed to f. Be aware, though, that if you do this the compiler will have a choice to create a Class1 or a Class2 object. The compiler will error at this point with an ambiguous overload.