|  | 
            Obtain an executor with the default allocator
            property.
          
constexpr basic_executor_type< std::allocator< void >, Bits > require( execution::allocator_t< void > ) const;
            Do not call this function directly. It is intended for use with the
            require
            customisation point.
          
For example:
auto ex1 = my_io_context.get_executor(); auto ex2 = asio::require(ex1, asio::execution::allocator);