Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

associated_immediate_executor::get

If T has a nested type immediate_executor_type, returns t.get_immediate_executor(). Otherwise returns boost::asio::require(ex, boost::asio::execution::blocking.never).

static decltype(auto) get(
    const T & t,
    const Executor & ex);