Syntax
std::vector<int> values{1, 2, 3};
std::map<std::string, int> scores;Examples
Working with standard containers
A small, runnable example of this syntax.
#include <iostream>
#include <map>
#include <vector>
int main() {
std::vector<int> values{1, 2, 3};
std::map<std::string, int> scores{{"Ada", 9}};
values.push_back(4);
std::cout << scores.at("Ada") << "\n";
}Best practices
- Use .at when an absent key should be treated as an error; use find when absence is an expected case.
- Keep examples small while learning, then combine the idea with a real project.
At a glance
- Purpose
- Systems and general-purpose software
- File extension
- .cpp · .hpp
- Runs in
- Compiled native applications
- Usually used with
- Compiler and standard library