Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Operator overloading in C++ to print contents of vector, map, pair ..
In this tutorial, we will be discussing a program to understand operator overloading in C++ to print contents of vector, map and pair.
Operator overloading is the function of operators which gives them the ability to act on User defined objects and work accordingly in a similar fashion.
Example
Vector
#include <iostream>
#include <vector>
using namespace std;
template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v){
os << "[";
for (int i = 0; i < v.size(); ++i) {
os << v[i];
if (i != v.size() - 1)
os << ", ";
}
os << "]\n";
return os;
}
int main() {
vector<int> vec{ 4, 2, 17, 11, 15 };
cout << vec;
return 0;
}Output
[4, 2, 17, 11, 15]
Map
#include <iostream>
#include <map>
using namespace std;
template <typename T, typename S>
ostream& operator<<(ostream& os, const map<T, S>& v){
for (auto it : v)
os << it.first << " : "
<< it.second << "\n";
return os;
}
int main(){
map<char, int> mp;
mp['b'] = 3;
mp['d'] = 5;
mp['a'] = 2;
cout << mp;
}Output
a : 2 b : 3 d : 5
Pair
#include <iostream>
using namespace std;
template <typename T, typename S>
ostream& operator<<(ostream& os, const pair<T, S>& v){
os << "(";
os << v.first << ", "
<< v.second << ")";
return os;
}
int main(){
pair<int, int> pi{ 45, 7 };
cout << pi;
return 0;
}Output
(45, 7)
Updated on: 14-Apr-2020
428 Views
Advertisements