Holds the result type of a valid tag_invoke call, or is empty otherwise.

Synopsis

Declared in <folly/functional/Invoke.h>

template<
    typename Tag,
    typename... Args>
struct tag_invoke_result
    : conditional_t<is_tag_invocable_v<Tag, Args...>, detail_tag_invoke_fn::defer<tag_invoke_result_t, Tag, Args...>, detail_tag_invoke_fn::empty>

Base Classes

Name

Description

conditional_t<is_tag_invocable_v<Tag, Args...>, detail_tag_invoke_fn::defer<tag_invoke_result_t, Tag, Args...>, detail_tag_invoke_fn::empty>

conditional_t

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