Elias decides to use the auto keyword introduced in C++11 . By writing auto it = accounts.begin(); , he tells the compiler, "You already know what accounts.begin() returns, so just make it that type".
However, Elias has to be careful. As some developers have discovered, using auto without specifying it as a reference (like auto& ) can sometimes lead to the compiler making a of the data instead of just looking at the original, which can cause performance issues or bugs in "convenience gone wrong" scenarios. Convenience Gone Wrong: A C++ auto Story
By using auto , Elias’s code becomes:
In the programming world, specifically within , the auto keyword is a tool used by developers to make their code cleaner and more readable by letting the compiler "deduce" or figure out a variable's data type for them.
: The focus is now on the action (the loop) rather than the technical type name.
Here is a short story of how auto is typically used to simplify a developer's life: The "Auto" Story: From Clutter to Clarity
: If Elias later changes the data structure from a vector to a list , he doesn't have to manually update every single type declaration; the auto keyword handles it automatically.