folly::_t

Declared in <folly/Traits.h>

Instead of:

using decayed = typename std::decay<T>::type;

With the C++14 standard trait aliases, we could use:

using decayed = std::decay_t<T>;

Without them, we could use:

using decayed = _t<std::decay<T>>;

Also useful for any other library with template types having dependent member types named type, like the standard trait types.

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