Question

How to pass vector to constructor in C++

Answer 1

#include <iostream>
#include <vector>

using namespace std; 
  
class Test { 
    vector<int> vec; 
  
public: 
    Test(vector<int> v) { 
       vec = v; 
    } 
    void print()  { 
        for (auto const& v : vec) cout << v << " ";
    } 
}; 
  
int main() 
{ 
    vector<int> vec; 
    
    for (int i = 1; i <= 7; i++) 
        vec.push_back(i); 
        
    Test obj(vec); 
    obj.print(); 
    
    return 0; 
} 


/*
run:

1 2 3 4 5 6 7 

*/

 

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Answer 2

#include <iostream>
#include <vector>

using namespace std; 
  
class Test { 
    vector<int> vec; 
  
public: 
    Test(vector<int> v) : vec(v) { } 
    void print()  { 
        for (auto const& v : vec) cout << v << " ";
    } 
}; 
  
int main() 
{ 
    vector<int> vec; 
    
    for (int i = 1; i <= 10; i++) 
        vec.push_back(i); 
        
    Test obj(vec); 
    obj.print(); 
    
    return 0; 
} 


/*
run:

1 2 3 4 5 6 7 8 9 10 

*/

 

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