Question

Have a look at the following piece of code

Header File:

class CxUser
{ 
public:
    CxUser(string& guid) {} 
};

I have a c++ file that instantiates the class using CxUser(string("xxx-xxx-x-xxxx")). But this statement fails to compile in g++ with error “no matching function for call to CxUser::CxUser(std::string)” whereas it compiles in VC++. Surprisingly, the following piece of code to instantiate the class works.

string guid("xxx-x-xxxx-xxx-xx"); CxUser user(guid);

Any help would be appreciated….

Answer 1

You need:

class CxUser{ public: CxUser(const string& guid) {} }

When you say:

CxUser c( "foobar" );   // or whatever

a temporary string object is created from the characterv array. In C++ you cannot bind non-const references to temporaries.