Method coroutine_ref

include/boost/asio/coroutine.hpp:270–270

{
public:
  coroutine_ref(coroutine& c) : value_(c.value_), modified_(false) {}
  coroutine_ref(coroutine* c) : value_(c->value_), modified_(false) {}
  coroutine_ref(const coroutine_ref&) = default;
  ~coroutine_ref() { if (!modified_) value_ = -1; }