Class executor

include/boost/asio/executor.hpp:50–350

Polymorphic wrapper for executors.

/// Polymorphic wrapper for executors.
class executor
{
public:
  /// Default constructor.
  executor() noexcept
    : impl_(0)
  {
  }

  /// Construct from nullptr.
  executor(nullptr_t) noexcept
    : impl_(0)
  {
  }

  /// Copy constructor.
  executor(const executor& other) noexcept
    : impl_(other.clone())
  {
  }

  /// Move constructor.
  executor(executor&& other) noexcept
    : impl_(other.impl_)
  {
    other.impl_ = 0;
  }

  /// Construct a polymorphic wrapper for the specified executor.
  template <typename Executor>
  executor(Executor e);

  /// Construct a polymorphic executor that points to the same target as
  /// another polymorphic executor.
  executor(std::nothrow_t, const executor& other) noexcept
    : impl_(other.clone())
  {
  }

  /// Construct a polymorphic executor that moves the target from another
  /// polymorphic executor.
  executor(std::nothrow_t, executor&& other) noexcept
    : impl_(other.impl_)
  {
    other.impl_ = 0;
  }

  /// Construct a polymorphic wrapper for the specified executor.
  template <typename Executor>
  executor(std::nothrow_t, Executor e) noexcept;

  /// Allocator-aware constructor to create a polymorphic wrapper for the
  /// specified executor.
  template <typename Executor, typename Allocator>
  executor(allocator_arg_t, const Allocator& a, Executor e);

  /// Destructor.
  ~executor()