C++11 re-introduces auto keyword that enables basic type inference. Using auto not only improves code readability.

When type inference fails

by Krzysztof Ostrowski

From the article:

Use of type inference puts impact on what is possible to be done with certain value, i.e. on its interface or concept it models, rather than on its concrete type. Unfortunately, auto does type inference locally, thus is not such powerful as we might expect. Here follows some examples of auto-inference failures.