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

strand::query

Forward a query to the underlying executor.

template<
    typename Property>
constraint< can_query< const Executor &, Property >::value, typename conditional< is_convertible< Property, execution::blocking_t >::value, execution::blocking_t, typename query_result< const Executor &, Property >::type >::type >::type query(
    const Property & p) const;

Do not call this function directly. It is intended for use with the query customisation point.

For example:

boost::asio::strand<my_executor_type> ex = ...;
if (boost::asio::query(ex, boost::asio::execution::blocking)
      == boost::asio::execution::blocking.never)
  ...