Replace boost by the standalone asio library

1 files changed, 341 insertions, 0 deletions

diff --git a/lib/asio/executor.hpp b/lib/asio/executor.hpp
new file mode 100644
index 0000000..e552cfb
--- /dev/null
+++ b/lib/asio/executor.hpp
@@ -0,0 +1,341 @@
+//
+// executor.hpp
+// ~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_EXECUTOR_HPP
+#define ASIO_EXECUTOR_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include <typeinfo>
+#include "asio/detail/cstddef.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/throw_exception.hpp"
+#include "asio/execution_context.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+/// Exception thrown when trying to access an empty polymorphic executor.
+class bad_executor
+  : public std::exception
+{
+public:
+  /// Constructor.
+  ASIO_DECL bad_executor() ASIO_NOEXCEPT;
+
+  /// Obtain message associated with exception.
+  ASIO_DECL virtual const char* what() const
+    ASIO_NOEXCEPT_OR_NOTHROW;
+};
+
+/// Polymorphic wrapper for executors.
+class executor
+{
+public:
+  /// Default constructor.
+  executor() ASIO_NOEXCEPT
+    : impl_(0)
+  {
+  }
+
+  /// Construct from nullptr.
+  executor(nullptr_t) ASIO_NOEXCEPT
+    : impl_(0)
+  {
+  }
+
+  /// Copy constructor.
+  executor(const executor& other) ASIO_NOEXCEPT
+    : impl_(other.clone())
+  {
+  }
+
+#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  /// Move constructor.
+  executor(executor&& other) ASIO_NOEXCEPT
+    : impl_(other.impl_)
+  {
+    other.impl_ = 0;
+  }
+#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Construct a polymorphic wrapper for the specified executor.
+  template <typename Executor>
+  executor(Executor e);
+
+  /// 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()
+  {
+    destroy();
+  }
+
+  /// Assignment operator.
+  executor& operator=(const executor& other) ASIO_NOEXCEPT
+  {
+    destroy();
+    impl_ = other.clone();
+    return *this;
+  }
+
+#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+  // Move assignment operator.
+  executor& operator=(executor&& other) ASIO_NOEXCEPT
+  {
+    destroy();
+    impl_ = other.impl_;
+    other.impl_ = 0;
+    return *this;
+  }
+#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
+
+  /// Assignment operator for nullptr_t.
+  executor& operator=(nullptr_t) ASIO_NOEXCEPT
+  {
+    destroy();
+    impl_ = 0;
+    return *this;
+  }
+
+  /// Assignment operator to create a polymorphic wrapper for the specified
+  /// executor.
+  template <typename Executor>
+  executor& operator=(ASIO_MOVE_ARG(Executor) e) ASIO_NOEXCEPT
+  {
+    executor tmp(ASIO_MOVE_CAST(Executor)(e));
+    destroy();
+    impl_ = tmp.impl_;
+    tmp.impl_ = 0;
+    return *this;
+  }
+
+  /// Obtain the underlying execution context.
+  execution_context& context() const ASIO_NOEXCEPT
+  {
+    return get_impl()->context();
+  }
+
+  /// Inform the executor that it has some outstanding work to do.
+  void on_work_started() const ASIO_NOEXCEPT
+  {
+    get_impl()->on_work_started();
+  }
+
+  /// Inform the executor that some work is no longer outstanding.
+  void on_work_finished() const ASIO_NOEXCEPT
+  {
+    get_impl()->on_work_finished();
+  }
+
+  /// Request the executor to invoke the given function object.
+  /**
+   * This function is used to ask the executor to execute the given function
+   * object. The function object is executed according to the rules of the
+   * target executor object.
+   *
+   * @param f The function object to be called. The executor will make a copy
+   * of the handler object as required. The function signature of the function
+   * object must be: @code void function(); @endcode
+   *
+   * @param a An allocator that may be used by the executor to allocate the
+   * internal storage needed for function invocation.
+   */
+  template <typename Function, typename Allocator>
+  void dispatch(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
+
+  /// Request the executor to invoke the given function object.
+  /**
+   * This function is used to ask the executor to execute the given function
+   * object. The function object is executed according to the rules of the
+   * target executor object.
+   *
+   * @param f The function object to be called. The executor will make
+   * a copy of the handler object as required. The function signature of the
+   * function object must be: @code void function(); @endcode
+   *
+   * @param a An allocator that may be used by the executor to allocate the
+   * internal storage needed for function invocation.
+   */
+  template <typename Function, typename Allocator>
+  void post(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
+
+  /// Request the executor to invoke the given function object.
+  /**
+   * This function is used to ask the executor to execute the given function
+   * object. The function object is executed according to the rules of the
+   * target executor object.
+   *
+   * @param f The function object to be called. The executor will make
+   * a copy of the handler object as required. The function signature of the
+   * function object must be: @code void function(); @endcode
+   *
+   * @param a An allocator that may be used by the executor to allocate the
+   * internal storage needed for function invocation.
+   */
+  template <typename Function, typename Allocator>
+  void defer(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
+
+  struct unspecified_bool_type_t {};
+  typedef void (*unspecified_bool_type)(unspecified_bool_type_t);
+  static void unspecified_bool_true(unspecified_bool_type_t) {}
+
+  /// Operator to test if the executor contains a valid target.
+  operator unspecified_bool_type() const ASIO_NOEXCEPT
+  {
+    return impl_ ? &executor::unspecified_bool_true : 0;
+  }
+
+  /// Obtain type information for the target executor object.
+  /**
+   * @returns If @c *this has a target type of type @c T, <tt>typeid(T)</tt>;
+   * otherwise, <tt>typeid(void)</tt>.
+   */
+#if !defined(ASIO_NO_TYPEID) || defined(GENERATING_DOCUMENTATION)
+  const std::type_info& target_type() const ASIO_NOEXCEPT
+  {
+    return impl_ ? impl_->target_type() : typeid(void);
+  }
+#else // !defined(ASIO_NO_TYPEID) || defined(GENERATING_DOCUMENTATION)
+  const void* target_type() const ASIO_NOEXCEPT
+  {
+    return impl_ ? impl_->target_type() : 0;
+  }
+#endif // !defined(ASIO_NO_TYPEID) || defined(GENERATING_DOCUMENTATION)
+
+  /// Obtain a pointer to the target executor object.
+  /**
+   * @returns If <tt>target_type() == typeid(T)</tt>, a pointer to the stored
+   * executor target; otherwise, a null pointer.
+   */
+  template <typename Executor>
+  Executor* target() ASIO_NOEXCEPT;
+
+  /// Obtain a pointer to the target executor object.
+  /**
+   * @returns If <tt>target_type() == typeid(T)</tt>, a pointer to the stored
+   * executor target; otherwise, a null pointer.
+   */
+  template <typename Executor>
+  const Executor* target() const ASIO_NOEXCEPT;
+
+  /// Compare two executors for equality.
+  friend bool operator==(const executor& a,
+      const executor& b) ASIO_NOEXCEPT
+  {
+    if (a.impl_ == b.impl_)
+      return true;
+    if (!a.impl_ || !b.impl_)
+      return false;
+    return a.impl_->equals(b.impl_);
+  }
+
+  /// Compare two executors for inequality.
+  friend bool operator!=(const executor& a,
+      const executor& b) ASIO_NOEXCEPT
+  {
+    return !(a == b);
+  }
+
+private:
+#if !defined(GENERATING_DOCUMENTATION)
+  class function;
+  template <typename, typename> class impl;
+
+#if !defined(ASIO_NO_TYPEID)
+  typedef const std::type_info& type_id_result_type;
+#else // !defined(ASIO_NO_TYPEID)
+  typedef const void* type_id_result_type;
+#endif // !defined(ASIO_NO_TYPEID)
+
+  template <typename T>
+  static type_id_result_type type_id()
+  {
+#if !defined(ASIO_NO_TYPEID)
+    return typeid(T);
+#else // !defined(ASIO_NO_TYPEID)
+    static int unique_id;
+    return &unique_id;
+#endif // !defined(ASIO_NO_TYPEID)
+  }
+
+  // Base class for all polymorphic executor implementations.
+  class impl_base
+  {
+  public:
+    virtual impl_base* clone() const ASIO_NOEXCEPT = 0;
+    virtual void destroy() ASIO_NOEXCEPT = 0;
+    virtual execution_context& context() ASIO_NOEXCEPT = 0;
+    virtual void on_work_started() ASIO_NOEXCEPT = 0;
+    virtual void on_work_finished() ASIO_NOEXCEPT = 0;
+    virtual void dispatch(ASIO_MOVE_ARG(function)) = 0;
+    virtual void post(ASIO_MOVE_ARG(function)) = 0;
+    virtual void defer(ASIO_MOVE_ARG(function)) = 0;
+    virtual type_id_result_type target_type() const ASIO_NOEXCEPT = 0;
+    virtual void* target() ASIO_NOEXCEPT = 0;
+    virtual const void* target() const ASIO_NOEXCEPT = 0;
+    virtual bool equals(const impl_base* e) const ASIO_NOEXCEPT = 0;
+
+  protected:
+    impl_base(bool fast_dispatch) : fast_dispatch_(fast_dispatch) {}
+    virtual ~impl_base() {}
+
+  private:
+    friend class executor;
+    const bool fast_dispatch_;
+  };
+
+  // Helper function to check and return the implementation pointer.
+  impl_base* get_impl() const
+  {
+    if (!impl_)
+    {
+      bad_executor ex;
+      asio::detail::throw_exception(ex);
+    }
+    return impl_;
+  }
+
+  // Helper function to clone another implementation.
+  impl_base* clone() const ASIO_NOEXCEPT
+  {
+    return impl_ ? impl_->clone() : 0;
+  }
+
+  // Helper function to destroy an implementation.
+  void destroy() ASIO_NOEXCEPT
+  {
+    if (impl_)
+      impl_->destroy();
+  }
+
+  impl_base* impl_;
+#endif // !defined(GENERATING_DOCUMENTATION)
+};
+
+} // namespace asio
+
+ASIO_USES_ALLOCATOR(asio::executor)
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/impl/executor.hpp"
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/impl/executor.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_EXECUTOR_HPP