Default by-reference capture can lead to dangling references; default by-value capture is susceptible to dangling pointers, while misleadingly susggests the lambdas are self-contained.

Perfect forwarding fails when template type deduction fails or when it deduces the wrong type.

There are several scenarios in which C++11’s move semantics do us no good:

Reference collapsing occurs in four contexts: template instantiation, auto type generation, creation and use of typedefs and alias declarations, and decltype.

Universal reference parameters often have efficiency advantages, but they typically have usability disadvantages.