Method reset

include/matchit.h:1222–1222

                return true;
            }
            constexpr void reset(int32_t depth) const { return block().reset(depth); }
            constexpr void confirm(int32_t depth) const { return block().confirm(depth); }
            constexpr bool hasValue() const { return block().hasValue(); }
            // non-const to inform users not to mark Id as const.