coroutine: coroutine_error + coroutine_errc

[SVN r85139]

src/exceptions.cpp

@@ -0,0 +1,36 @@
+
+//          Copyright Oliver Kowalke 2009.
+// 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)
+
+#include <boost/coroutine/exceptions.hpp>
+
+namespace boost {
+namespace coroutines {
+
+class coroutine_error_category : public system::error_category
+{
+public:
+    virtual const char* name() const BOOST_NOEXCEPT
+    { return "coroutine"; }
+
+    virtual std::string message( int ev) const
+    {
+        switch (BOOST_SCOPED_ENUM_NATIVE(coroutine_errc)(ev))
+        {
+        case coroutine_errc::no_data:
+            return std::string("Operation not permitted because coroutine "
+                          "has no valid result.");
+        }
+        return std::string("unspecified coroutine_errc value\n");
+    }
+};
+
+system::error_category const& coroutine_category() BOOST_NOEXCEPT
+{
+    static coroutines::coroutine_error_category cat;
+    return cat;
+}
+
+}}