instance lifetime question

Below I detailed a scenario I'm looking at, and would like to know
what the lifetime of the instance of the string is in the "FooClass
fooClass(string("somestring"))"  is below.  Is the instance of the
string object destroyed after the constructor is called?  Seems like
it would be, but I'm not really sure what the scope of that object
would be.  Is it tem****ary, or would it live until fooClass goes out
of scope, and is destroyed?

Thanks,

Example scenario

    class FooClass {
        public:
        FooClass(string &str) : s(&str)
          {}

        void exec() {
          //manipulate member s
          s.append("X");  //As an example
        }
        private:
        string *s;
    };

func() {
    FooClass fooClass(string("somestring"));

    while(1) {
         //Do stuff with the string
         fooClass.exec();
    }
}



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