C++ : How to Initialize a map in one line using initialzer_list ?

https://thispointer.com/how-to-initialize-a-map-with-stdinitialzer_list/

Syntax:
{
{key1, val1}, 
{key2, val2},
...
{keyN, valN}
}

Hint:
map store the elements internally as a pair, i.e., key-value pair.


Example1: 

Save as: your_file.cpp

#include <vector>

#include <map>

#include <initializer_list>

#include <iostream>

 

class Course {

std::map<std::string, int> mMapOfMarks;

 

public:

Course(std::initializer_list<std::pair<const std::string, int> > marksMap) :

mMapOfMarks(marksMap) {

}

void display() {

for (auto entry : mMapOfMarks)

std::cout << entry.first << " :: " << entry.second << std::endl;

std::cout << std::endl;

}

 

};

 

int main() {

// Creating a Course Object and calling the constructor

// that accepts a initializer_list

Course mathsCourse { { "Riti", 2 }, { "Jack", 4 } };

 

mathsCourse.display();

return 0;

}

compile:
g++ -std=c++11 your_file.cpp -o your_program