A trait type to test whether a metafunction succeeds in substitution.

Synopsis

Declared in <folly/Traits.h>

template<
    template<typename...> typename T,
    typename... A>
struct is_detected
    : detected_or<nonesuch, T, A...>::value_t

Base Classes

Name

Description

detected_or<nonesuch, T, A...>::value_t

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