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This is an older version of Boost and was released in 2023. The current version is 1.89.0.
boost::stl_interfaces::v1_dtl::clear_impl<D, void_t< decltype(std::declval< D >().clear())>>
// In header: <boost/stl_interfaces/sequence_container_interface.hpp> template<typename D> struct clear_impl<D, void_t< decltype(std::declval< D >().clear())>> { // public static functions static constexpr void call(D &) noexcept; };