C++ Maps

#include <map>

Define a new map:

std::vector<std::string, float> my_map;

Get data from map:

int value = my_map[key];
int value = my_map.at(key);

Inserting/modifying map data:

my_map[new_key] = new_value;
my_map.insert(std::pair<std::string, float>(new_key, new_value);

Check if the map has a key:

if (my_map.find(key) != my_map.end()) { // ...

Remove a key/value pair from map:

my_map.erase(key);

Example

http://cpp.sh/4kpgp

#include <iostream>
#include <map>
#include <string>

int main() {
	std::map<std::string, float> grades;

	grades.insert(std::pair<std::string, float>("Hoani", 3.5f));
	grades.insert(std::pair<std::string, float>("Emma", 2.3f));
	grades["Indie"] =  4.9f;

	for (std::pair<std::string, float> grade: grades) {
		std::cout << grade.first << ":" << grade.second << std::endl;
	}
}