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A customisation point that notifies an operation state object to start its associated operation.
constexpr unspecified start = unspecified;
The name execution::start denotes a customisation point object.
The expression execution::start(R) for some subexpression R
is expression-equivalent to:
R.start(), if that expression is valid.
start(R), if that expression is valid, with overload
resolution performed in a context that includes the declaration void
start(); and that does not include a declaration of execution::start.
execution::start(R) is ill-formed.
Header: asio/execution/start.hpp
Convenience header: asio/execution.hpp