##### basic_system_executor::query (1 of 4 overloads)

Query the current value of the `mapping` property.

    static constexpr execution::mapping_t query(
        execution::mapping_t );

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

For example:

    asio::system_executor ex;
    if (asio::query(ex, asio::execution::mapping)
          == asio::execution::mapping.thread)
      ...