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The type of the function's second argument.
typedef see_below second_argument_type;
The type of second_argument_type is based on the type T
of the wrapper's target object:
T is a pointer to a function type accepting two arguments,
second_argument_type is a synonym for the return type
of T;
T is a class type with a member type first_argument_type,
then second_argument_type is a synonym for T::second_argument_type;
second_argument_type is not defined.
Header: asio/bind_executor.hpp
Convenience header: asio.hpp