Class either_blocking_executor

test/execution/prefer_only.cpp:161–205

} // namespace boost

struct either_blocking_executor
{
  execution::blocking_t blocking_;

  explicit either_blocking_executor(execution::blocking_t b)
    : blocking_(b)
  {
  }

  execution::blocking_t query(execution::blocking_t) const noexcept
  {
    return blocking_;
  }

  either_blocking_executor require(execution::blocking_t::possibly_t) const
  {
    return either_blocking_executor(execution::blocking.possibly);
  }

  either_blocking_executor require(execution::blocking_t::never_t) const
  {
    return either_blocking_executor(execution::blocking.never);
  }

  template <typename F>
  void execute(const F&) const
  {
    if (blocking_ == execution::blocking.never)
      ++never_blocking_count;
    else
      ++possibly_blocking_count;
  }

  friend bool operator==(const either_blocking_executor& a,
      const either_blocking_executor& b) noexcept
  {
    return a.blocking_ == b.blocking_;
  }

  friend bool operator!=(const either_blocking_executor& a,
      const either_blocking_executor& b) noexcept
  {
    return a.blocking_ != b.blocking_;
  }
};

namespace boost {
namespace asio {