CODEWITHSUNDEEP
c++stringdata-members
Tanisha Shrotriya
Tanisha Shrotriya

Reputation: 19

Using an array to store only Names of the data members of a class in C++

Suppose I have a class as 

class A {
  char a[15], b[11],c[17];
public:
  void names();

}
void A :: names() {
   char x[20];
   x=a;
   cout<<x;
   x=b;
   cout<<x;
   x=c;
   cout<<x;
}

I want to copy data in x from each member of A one by one and use a for loop to represent the member names. is there a way in which I can store them? So something like-

    void A :: names() {
           char x[20];
           while(all members of A not traversed){
                 x=current member;
                 cout<<x;
                 update member;
          }
    }

Upvotes: 1

Views: 167

Answers (2)

Serge Ballesta
Serge Ballesta

Reputation: 148965

The idiomatic way to do this in C++ is through pointers.

class A {
  char a[15], b[11],c[17];
  char *members[3] = {a, b, c}; // valid only for c++11 or above
public:
  void names();
};

void A::names() {
    for (char *x: members) {  // c++11 range loop...
        cout << x << endl;
    }
}

But except if you have strong reasons to use raw char arrays, std::string is generally simpler to use...

Upvotes: 0

xhg
xhg

Reputation: 1885

Sounds like you want to iterate through a class's members. Like

for (variable in a's members) {
    a.x append variable's value
}

There is no trivial methods to iterate through a class's members. You should use a map instead, which provide iteration features among keys. 

for (auto const& x : the_map) {
    x.first  // name or key
    x.second // value
}

Upvotes: 1

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