Chapter 16

1: Consider the following class declaration:
class RQ1
{
private:
    char * st;       // points to C-style string
public:
    RQ1() { st = new char [1]; strcpy(st,""); }
    RQ1(const char * s)
    {st = new char [strlen(s) + 1]; strcpy(st, s); }
    RQ1(const RQ1 & rq)
    {st = new char [strlen(rq.st) + 1]; strcpy(st, rq.st); }
    ~RQ1() {delete [] st};
    RQ & operator=(const RQ & rq);
    // more stuff
};

Convert this to a declaration using a string object instead. What methods no longer need an explicit definition?

A1: 
#include <string>
using namespace std;
class RQ1
{
private:
    string st;       // a string object
public:
    RQ1() : st("") {}
    RQ1(const char * s) : st(s) {}
    ~RQ1() {};
// more stuff
};
The explicit copy constructor, destructor, and assignment operator no longer ...

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