Modern C++ Programming Cookbook

How to do it...

Range-based for loops can be used in various ways:

• By committing to a specific type for the elements of the sequence:

        auto rates = getRates();        for (int rate : rates)           std::cout << rate << std::endl;         for (int& rate : rates)           rate *= 2;

• By not specifying a type and letting the compiler deduce it:

        for (auto&& rate : getRates())           std::cout << rate << std::endl;         for (auto & rate : rates)           rate *= 2;         for (auto const & rate : rates)           std::cout << rate << std::endl;

• By using structured bindings and decomposition declaration in C++17:

        for (auto&& [rate, flag] : getRates2())           std::cout << rate << std::endl;