From 98f58eec1fa99d77ecd1d6a8821c9d49fd9d358a Mon Sep 17 00:00:00 2001
From: Christopher Kohlhoff <chris@kohlhoff.com>
Date: Sun, 17 Oct 2021 11:08:58 +1100
Subject: [PATCH] Enable separate compilation for any_io_executor.

---
 include/boost/asio/any_io_executor.hpp      |  77 ++++++------
 include/boost/asio/impl/any_io_executor.ipp | 126 ++++++++++++++++++++
 include/boost/asio/impl/src.hpp             |   1 +
 3 files changed, 166 insertions(+), 38 deletions(-)
 create mode 100644 include/boost/asio/impl/any_io_executor.ipp

diff --git a/include/boost/asio/any_io_executor.hpp b/include/boost/asio/any_io_executor.hpp
index 8eb3d724..dffd9e5b 100644
--- a/include/boost/asio/any_io_executor.hpp
+++ b/include/boost/asio/any_io_executor.hpp
@@ -88,29 +88,17 @@ public:
 #endif // !defined(GENERATING_DOCUMENTATION)
 
   /// Default constructor.
-  any_io_executor() BOOST_ASIO_NOEXCEPT
-    : base_type()
-  {
-  }
+  BOOST_ASIO_DECL any_io_executor() BOOST_ASIO_NOEXCEPT;
 
   /// Construct in an empty state. Equivalent effects to default constructor.
-  any_io_executor(nullptr_t) BOOST_ASIO_NOEXCEPT
-    : base_type(nullptr_t())
-  {
-  }
+  BOOST_ASIO_DECL any_io_executor(nullptr_t) BOOST_ASIO_NOEXCEPT;
 
   /// Copy constructor.
-  any_io_executor(const any_io_executor& e) BOOST_ASIO_NOEXCEPT
-    : base_type(static_cast<const base_type&>(e))
-  {
-  }
+  BOOST_ASIO_DECL any_io_executor(const any_io_executor& e) BOOST_ASIO_NOEXCEPT;
 
 #if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
   /// Move constructor.
-  any_io_executor(any_io_executor&& e) BOOST_ASIO_NOEXCEPT
-    : base_type(static_cast<base_type&&>(e))
-  {
-  }
+  BOOST_ASIO_DECL any_io_executor(any_io_executor&& e) BOOST_ASIO_NOEXCEPT;
 #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 
   /// Construct to point to the same target as another any_executor.
@@ -159,38 +147,23 @@ public:
 #endif // defined(GENERATING_DOCUMENTATION)
 
   /// Assignment operator.
-  any_io_executor& operator=(const any_io_executor& e) BOOST_ASIO_NOEXCEPT
-  {
-    base_type::operator=(static_cast<const base_type&>(e));
-    return *this;
-  }
+  BOOST_ASIO_DECL any_io_executor& operator=(
+      const any_io_executor& e) BOOST_ASIO_NOEXCEPT;
 
 #if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
   /// Move assignment operator.
-  any_io_executor& operator=(any_io_executor&& e) BOOST_ASIO_NOEXCEPT
-  {
-    base_type::operator=(static_cast<base_type&&>(e));
-    return *this;
-  }
+  BOOST_ASIO_DECL any_io_executor& operator=(
+      any_io_executor&& e) BOOST_ASIO_NOEXCEPT;
 #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
 
   /// Assignment operator that sets the polymorphic wrapper to the empty state.
-  any_io_executor& operator=(nullptr_t)
-  {
-    base_type::operator=(nullptr_t());
-    return *this;
-  }
+  BOOST_ASIO_DECL any_io_executor& operator=(nullptr_t);
 
   /// Destructor.
-  ~any_io_executor()
-  {
-  }
+  BOOST_ASIO_DECL ~any_io_executor();
 
   /// Swap targets with another polymorphic wrapper.
-  void swap(any_io_executor& other) BOOST_ASIO_NOEXCEPT
-  {
-    static_cast<base_type&>(*this).swap(static_cast<base_type&>(other));
-  }
+  BOOST_ASIO_DECL void swap(any_io_executor& other) BOOST_ASIO_NOEXCEPT;
 
   /// Obtain a polymorphic wrapper with the specified property.
   /**
@@ -231,6 +204,30 @@ public:
 
 #if !defined(GENERATING_DOCUMENTATION)
 
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::require(
+    const execution::blocking_t::never_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::blocking_t::possibly_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::outstanding_work_t::tracked_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::outstanding_work_t::untracked_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::relationship_t::fork_t&, int) const;
+
+template <>
+BOOST_ASIO_DECL any_io_executor any_io_executor::prefer(
+    const execution::relationship_t::continuation_t&, int) const;
+
 namespace traits {
 
 #if !defined(BOOST_ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
@@ -299,4 +296,8 @@ struct prefer_member<any_io_executor, Prop> :
 
 #include <boost/asio/detail/pop_options.hpp>
 
+#if defined(BOOST_ASIO_HEADER_ONLY)
+# include <boost/asio/impl/any_io_executor.ipp>
+#endif // defined(BOOST_ASIO_HEADER_ONLY)
+
 #endif // BOOST_ASIO_ANY_IO_EXECUTOR_HPP
diff --git a/include/boost/asio/impl/any_io_executor.ipp b/include/boost/asio/impl/any_io_executor.ipp
new file mode 100644
index 00000000..3578301c
--- /dev/null
+++ b/include/boost/asio/impl/any_io_executor.ipp
@@ -0,0 +1,126 @@
+//
+// impl/any_io_executor.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 BOOST_ASIO_IMPL_ANY_IO_EXECUTOR_IPP
+#define BOOST_ASIO_IMPL_ANY_IO_EXECUTOR_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/any_io_executor.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+any_io_executor::any_io_executor() BOOST_ASIO_NOEXCEPT
+  : base_type()
+{
+}
+
+any_io_executor::any_io_executor(nullptr_t) BOOST_ASIO_NOEXCEPT
+  : base_type(nullptr_t())
+{
+}
+
+any_io_executor::any_io_executor(const any_io_executor& e) BOOST_ASIO_NOEXCEPT
+  : base_type(static_cast<const base_type&>(e))
+{
+}
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+any_io_executor::any_io_executor(any_io_executor&& e) BOOST_ASIO_NOEXCEPT
+  : base_type(static_cast<base_type&&>(e))
+{
+}
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+any_io_executor& any_io_executor::operator=(
+    const any_io_executor& e) BOOST_ASIO_NOEXCEPT
+{
+  base_type::operator=(static_cast<const base_type&>(e));
+  return *this;
+}
+
+#if defined(BOOST_ASIO_HAS_MOVE)
+any_io_executor& any_io_executor::operator=(
+    any_io_executor&& e) BOOST_ASIO_NOEXCEPT
+{
+  base_type::operator=(static_cast<base_type&&>(e));
+  return *this;
+}
+#endif // defined(BOOST_ASIO_HAS_MOVE)
+
+any_io_executor& any_io_executor::operator=(nullptr_t)
+{
+  base_type::operator=(nullptr_t());
+  return *this;
+}
+
+any_io_executor::~any_io_executor()
+{
+}
+
+void any_io_executor::swap(any_io_executor& other) BOOST_ASIO_NOEXCEPT
+{
+  static_cast<base_type&>(*this).swap(static_cast<base_type&>(other));
+}
+
+template <>
+any_io_executor any_io_executor::require(
+    const execution::blocking_t::never_t& p, int) const
+{
+  return static_cast<const base_type&>(*this).require(p);
+}
+
+template <>
+any_io_executor any_io_executor::prefer(
+    const execution::blocking_t::possibly_t& p, int) const
+{
+  return static_cast<const base_type&>(*this).prefer(p);
+}
+
+template <>
+any_io_executor any_io_executor::prefer(
+    const execution::outstanding_work_t::tracked_t& p, int) const
+{
+  return static_cast<const base_type&>(*this).prefer(p);
+}
+
+template <>
+any_io_executor any_io_executor::prefer(
+    const execution::outstanding_work_t::untracked_t& p, int) const
+{
+  return static_cast<const base_type&>(*this).prefer(p);
+}
+
+template <>
+any_io_executor any_io_executor::prefer(
+    const execution::relationship_t::fork_t& p, int) const
+{
+  return static_cast<const base_type&>(*this).prefer(p);
+}
+
+template <>
+any_io_executor any_io_executor::prefer(
+    const execution::relationship_t::continuation_t& p, int) const
+{
+  return static_cast<const base_type&>(*this).prefer(p);
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_IMPL_ANY_IO_EXECUTOR_IPP
diff --git a/include/boost/asio/impl/src.hpp b/include/boost/asio/impl/src.hpp
index c7e8e386..76cbc1c6 100644
--- a/include/boost/asio/impl/src.hpp
+++ b/include/boost/asio/impl/src.hpp
@@ -19,6 +19,7 @@
 # error Do not compile Asio library source with BOOST_ASIO_HEADER_ONLY defined
 #endif
 
+#include <boost/asio/impl/any_io_executor.ipp>
 #include <boost/asio/impl/error.ipp>
 #include <boost/asio/impl/execution_context.ipp>
 #include <boost/asio/impl/executor.ipp>