编译器无法将vector识别为类成员

Question

enter image description here I am trying out some STL programs. I have declared a vector in main and tried to run the program it is working but if i declare the same(vector) inside the class then am getting a compilation error. I think compiler is not recognizing vector(declared inside the class).

I have tried with std:: also still same error. I am using netbeans IDE and cigwin compiler.

please find the code below

#include <cstdlib>
#include <iostream>
#include <vector>
#include <cctype>
using namespace std;

/*
 * 
*/

class vectorcl 
{
   vector<int> v(10);
   int i;
public:
   vectorcl();
   void add_vector();
   void dis_vector();

};

vectorcl :: vectorcl()
{
    for(i =0;i<10 ;i++)
    {
       v[i] = 0;
    }
}

void vectorcl :: dis_vector()
{     
   cout<< " The vale is : \n";
   for(i =0;i<10 ;i++)
   {
       cout << "\t " <<v[i];
   }
}

void vectorcl :: add_vector()
{
   for (i =0 ; i<10; i++)
   {
       v[i] = i+1;
   }
}

int main(int argc, char** argv) {
//    vector<int> vp(10);
//    for(int j =0;j<10 ;j++)
//    {
//        cout << " " << vp[j];
//    }

   vectorcl v1;
   v1.dis_vector();
   v1.add_vector();
   v1.dis_vector();
   return 0;
}

Please help me in this, my question is why my compiler is not recognizing vector declared inside a class.

error : expected identifier before numeric constant expected ',' or '...'before numeric constant

Error

Answer 1

You can not use vector<int> v(10); as member variable. The solution is to replace it by vector<int> v; and add this alter the constructor like this:

vectorcl::vectorcl():
    v(std::vector<int>(10,0/* This 0 is instead of the for-loop*/)){
}

Or another option is to declare it as :

std::vector<int> v = std::vector<int>(10);

PS there is no need to declare int i as class member. Just declare it in every function you need.

Answer 2

From first glance, you are trying to call the constructor in the class prototype: vector<int> v(10); . Your constructor for that class will be called in your wrapper class constructor unless you use a member initialization list.

Edit: using member initialization

vectorcl :: vectorcl(): v(10)
{
}