[C++] vector (벡터) 복사하기

반복자

#include <iostream>
#include <vector>

using namespace std;

void printVector(const vector<int> v) {
    cout << "The vector elements are: ";
    for (int i = 0; i < v.size(); i++)
    cout << v[i] << " ";
    
    cout << endl;
}

int main() {
    vector<int> vect1{1, 2, 3, 4};
    vector<int> vect2;
    
    for (int i = 0; i < vect1.size(); i++) {
        vect2.push_back(vect1[i]);
    }
    
    cout << "Old vector elements are : ";
    printVector(vect1);
    
    cout << "New vector elements are : ";
    printVector(vect2);
    
    vect1[0] = 2;
    
    cout << "The first element of old vector is :";
    cout << vect1[0] << endl;
    cout << "The first element of new vector is :";
    cout << vect2[0] <<endl;
    
    return 0;
}

 

출력

Old vector elements are : 1 2 3 4 
New vector elements are : 1 2 3 4 
The first element of old vector is :2
The first element of new vector is :1

할당 연산자 =(Assignment Operator =)

#include <iostream>
#include <vector>

using namespace std;

void printVector(const vector<int> v) {
    for (int i = 0; i < v.size(); i++)
    cout << v[i] << " ";
    
    cout << endl;
}

int main() {
    vector<int> vect1{1, 2, 3, 4};
    vector<int> vect2;
    
    vect2 = vect1;
    
    cout << "Old vector elements are : ";
    printVector(vect1);
    
    cout << "New vector elements are : ";
    printVector(vect2);
    
    vect1[0] = 2;
    
    cout << "The first element of old vector is :";
    cout << vect1[0] << endl;
    cout << "The first element of new vector is :";
    cout << vect2[0] <<endl;
    
    return 0;
}

 

출력

Old vector elements are : 1 2 3 4 
New vector elements are : 1 2 3 4 
The first element of old vector is :2
The first element of new vector is :1

벡터를 생성자로 전달하기(Passing Vector as Constructor)

#include <iostream>
#include <vector>

using namespace std;

void printVector(const vector<int> v) {
    for (int i = 0; i < v.size(); i++)
    cout << v[i] << " ";
    
    cout << endl;
}

int main() {
    vector<int> vect1{1, 2, 3, 4};
    vector<int> vect2(vect1);
    
    cout << "Old vector elements are : ";
    printVector(vect1);
    
    cout << "New vector elements are : ";
    printVector(vect2);
    
    vect1[0] = 2;
    
    cout << "The first element of old vector is :";
    cout << vect1[0] << endl;
    cout << "The first element of new vector is :";
    cout << vect2[0] <<endl;
    
    return 0;
}

 

출력

Old vector elements are : 1 2 3 4 
New vector elements are : 1 2 3 4 
The first element of old vector is :2
The first element of new vector is :1

내장 함수(Inbuilt Functions)

copy(first_iterator_o, last_iterator_o, back_inserter());

 

#include <iostream>
#include <vector>

using namespace std;

void printVector(const vector<int> v) {
    for (int i = 0; i < v.size(); i++)
    cout << v[i] << " ";
    
    cout << endl;
}

int main() {
    vector<int> vect1{1, 2, 3, 4};
    vector<int> vect2;
    
    copy(vect1.begin(), vect1.end(), back_inserter(vect2));
    
    cout << "Old vector elements are : ";
    printVector(vect1);
    
    cout << "New vector elements are : ";
    printVector(vect2);
    
    vect1[0] = 2;
    
    cout << "The first element of old vector is :";
    cout << vect1[0] << endl;
    cout << "The first element of new vector is :";
    cout << vect2[0] <<endl;
    
    return 0;
}

 

출력

Old vector elements are : 1 2 3 4 
New vector elements are : 1 2 3 4 
The first element of old vector is :2
The first element of new vector is :1

 

 

assign(first_iterator_o, last_iterator_o);

#include <iostream>
#include <vector>

using namespace std;

void printVector(const vector<int> v) {
    for (int i = 0; i < v.size(); i++)
    cout << v[i] << " ";
    
    cout << endl;
}

int main() {
    vector<int> vect1{1, 2, 3, 4};
    vector<int> vect2;
    
    vect2.assign(vect1.begin(), vect1.end());
    
    cout << "Old vector elements are : ";
    printVector(vect1);
    
    cout << "New vector elements are : ";
    printVector(vect2);
    
    vect1[0] = 2;
    
    cout << "The first element of old vector is :";
    cout << vect1[0] << endl;
    cout << "The first element of new vector is :";
    cout << vect2[0] <<endl;
    
    return 0;
}

 

출력

Old vector elements are : 1 2 3 4 
New vector elements are : 1 2 3 4 
The first element of old vector is :2
The first element of new vector is :1

 

https://blog.naver.com/roxy2131/222129522824