+++
title = "`is_failure_type<T>`"
description = "An integral constant boolean variable true for `failure_type<EC, E = void>` types."
+++

An integral constant boolean variable true for {{% api "failure_type<EC, EP = void>" %}} types.

*Overridable*: Not overridable.

*Namespace*: `BOOST_OUTCOME_V2_NAMESPACE`

*Header*: `<boost/outcome/success_failure.hpp>`
