# std::experimental::void_t

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< cpp‎ | experimental

Defined in header `<experimental/type_traits>` |  |
template< class... > using void_t = void; |  | (library fundamentals TS v2)

A utility metafunction that maps a sequence of any types to the type void.

### Notes

This utility metafunction is used in template metaprogramming to detect ill-formed types in SFINAE context. First voted into C++17 as std::void_t, it was later added as well to the library fundamentals TS as `std::experimental::void_t`, because it is a dependency of the detection idiom.

### See also

void_t (C++17) | void variadic alias template (alias template)

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