exclude ctor with forwarding-reference from overload resolution

- prevents ctor with forwarding-reference to be used a copy-ctor

include/boost/coroutine2/detail/disable_overload.hpp

@@ -0,0 +1,34 @@
+
+//          Copyright Oliver Kowalke 2014.
+// 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_COROUTINES2_DETAIL_DISABLE_OVERLOAD_H
+#define BOOST_COROUTINES2_DETAIL_DISABLE_OVERLOAD_H
+
+#include <type_traits>
+
+#include <boost/config.hpp>
+#include <boost/context/detail/disable_overload.hpp>
+
+#include <boost/coroutine2/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace coroutines2 {
+namespace detail {
+
+template< typename X, typename Y >
+using disable_overload = boost::context::detail::disable_overload< X, Y >;
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_COROUTINES2_DETAIL_DISABLE_OVERLOAD_H

include/boost/coroutine2/detail/pull_coroutine.hpp

@@ -14,6 +14,7 @@
 #include <boost/config.hpp>
 
 #include <boost/coroutine2/detail/config.hpp>
+#include <boost/coroutine2/detail/disable_overload.hpp>
 
 #ifdef BOOST_HAS_ABI_HEADERS
 #  include BOOST_ABI_PREFIX
@@ -38,7 +39,9 @@ private:
     bool has_result_() const noexcept;
 
 public:
-    template< typename Fn >
+    template< typename Fn,
+              typename = detail::disable_overload< pull_coroutine, Fn >
+    >
     explicit pull_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >
@@ -148,7 +151,9 @@ private:
     bool has_result_() const noexcept;
 
 public:
-    template< typename Fn >
+    template< typename Fn,
+              typename = detail::disable_overload< pull_coroutine, Fn >
+    >
     explicit pull_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >
@@ -256,7 +261,9 @@ private:
     explicit pull_coroutine( control_block *) noexcept;
 
 public:
-    template< typename Fn >
+    template< typename Fn,
+              typename = detail::disable_overload< pull_coroutine, Fn >
+    >
     explicit pull_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >

include/boost/coroutine2/detail/pull_coroutine.ipp

@@ -15,6 +15,7 @@
 
 #include <boost/coroutine2/detail/config.hpp>
 #include <boost/coroutine2/detail/create_control_block.ipp>
+#include <boost/coroutine2/detail/disable_overload.hpp>
 #include <boost/coroutine2/fixedsize_stack.hpp>
 #include <boost/coroutine2/segmented_stack.hpp>
 
@@ -40,7 +41,9 @@ pull_coroutine< T >::has_result_() const noexcept {
 }
 
 template< typename T >
-template< typename Fn >
+template< typename Fn,
+          typename
+>
 pull_coroutine< T >::pull_coroutine( Fn && fn) :
     pull_coroutine{ default_stack(), std::forward< Fn >( fn) } {
 }
@@ -107,7 +110,9 @@ pull_coroutine< T & >::has_result_() const noexcept {
 }
 
 template< typename T >
-template< typename Fn >
+template< typename Fn,
+          typename
+>
 pull_coroutine< T & >::pull_coroutine( Fn && fn) :
     pull_coroutine{ default_stack(), std::forward< Fn >( fn) } {
 }
@@ -167,7 +172,9 @@ pull_coroutine< void >::pull_coroutine( control_block * cb) noexcept :
     cb_{ cb } {
 }
 
-template< typename Fn >
+template< typename Fn,
+          typename
+>
 pull_coroutine< void >::pull_coroutine( Fn && fn) :
     pull_coroutine{ default_stack(), std::forward< Fn >( fn) } {
 }

include/boost/coroutine2/detail/push_coroutine.hpp

@@ -14,6 +14,7 @@
 #include <boost/config.hpp>
 
 #include <boost/coroutine2/detail/config.hpp>
+#include <boost/coroutine2/detail/disable_overload.hpp>
 
 #ifdef BOOST_HAS_ABI_HEADERS
 #  include BOOST_ABI_PREFIX
@@ -36,7 +37,9 @@ private:
     explicit push_coroutine( control_block *) noexcept;
 
 public:
-    template< typename Fn >
+    template< typename Fn,
+              typename = detail::disable_overload< push_coroutine, Fn >
+    >
     explicit push_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >
@@ -114,7 +117,9 @@ private:
     explicit push_coroutine( control_block *) noexcept;
 
 public:
-    template< typename Fn >
+    template< typename Fn,
+              typename = detail::disable_overload< push_coroutine, Fn >
+    >
     explicit push_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >
@@ -190,7 +195,9 @@ private:
     explicit push_coroutine( control_block *) noexcept;
 
 public:
-    template< typename Fn >
+    template< typename Fn,
+              typename = detail::disable_overload< push_coroutine, Fn >
+    >
     explicit push_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >

include/boost/coroutine2/detail/push_coroutine.ipp

@@ -14,6 +14,7 @@
 
 #include <boost/coroutine2/detail/config.hpp>
 #include <boost/coroutine2/detail/create_control_block.ipp>
+#include <boost/coroutine2/detail/disable_overload.hpp>
 #include <boost/coroutine2/fixedsize_stack.hpp>
 #include <boost/coroutine2/segmented_stack.hpp>
 
@@ -33,7 +34,9 @@ push_coroutine< T >::push_coroutine( control_block * cb) noexcept :
 }
 
 template< typename T >
-template< typename Fn >
+template< typename Fn,
+          typename
+>
 push_coroutine< T >::push_coroutine( Fn && fn) :
     push_coroutine{ default_stack(), std::forward< Fn >( fn) } {
 }
@@ -91,7 +94,9 @@ push_coroutine< T & >::push_coroutine( control_block * cb) noexcept :
 }
 
 template< typename T >
-template< typename Fn >
+template< typename Fn,
+          typename
+>
 push_coroutine< T & >::push_coroutine( Fn && fn) :
     push_coroutine{ default_stack(), std::forward< Fn >( fn) } {
 }
@@ -141,7 +146,9 @@ push_coroutine< void >::push_coroutine( control_block * cb) noexcept :
     cb_{ cb } {
 }
 
-template< typename Fn >
+template< typename Fn,
+          typename
+>
 push_coroutine< void >::push_coroutine( Fn && fn) :
     push_coroutine{ default_stack(), std::forward< Fn >( fn) } {
 }