### execution::can_start

A type trait that determines whether a `start` expression is well-formed.

    template<
        typename R>
    struct can_start

Class template `can_start` is a trait that is derived from `true_type` if the expression `execution::start(std::declval<R>(), std::declval<E>())` is well formed; otherwise `false_type`.

##### Requirements

Header: `asio/execution/start.hpp`

Convenience header: `asio/execution.hpp`