What is the auto keyword in C++?

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

int main() {
    auto n = 5;                                  // int
    auto d = 2.5;                                // double
    auto name = std::string("C++");
    std::vector<std::map<std::string, int>> data = {{{"a", 1}}};
    for (const auto& m : data) {                 // no long type name
        std::cout << m.size() << '\n';
    }
    std::cout << n << ' ' << d << ' ' << name << '\n';
}

• auto needs an initial value.
• auto removes const and references: use const auto& when you need them.

See C++ Variables.

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