-#if BOOST_VERSION < 105600
- boost::context::fcontext_t* fc_ = nullptr;
- typedef intptr_t arg_type;
-#elif BOOST_VERSION < 106100
- boost::context::fcontext_t fc_;
- typedef intptr_t arg_type;
+#if BOOST_VERSION < 106100
+ boost::context::fcontext_t fc_{};
+ using arg_type = intptr_t;