add boost on mac

macx64/include/boost/outcome/experimental/status-code/iostream_support.hpp

@@ -0,0 +1,78 @@
+/* Proposed SG14 status_code
+(C) 2018-2019 Niall Douglas <http://www.nedproductions.biz/> (5 commits)
+File Created: Feb 2018
+
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef BOOST_OUTCOME_SYSTEM_ERROR2_IOSTREAM_SUPPORT_HPP
+#define BOOST_OUTCOME_SYSTEM_ERROR2_IOSTREAM_SUPPORT_HPP
+
+#include "error.hpp"
+
+#include <iostream>
+
+BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_BEGIN
+
+/*! Print the status code to a `std::ostream &`.
+Requires that `DomainType::value_type` implements an `operator<<` overload for `std::ostream`.
+*/
+template <class DomainType,  //
+          typename std::enable_if<std::is_same<std::ostream, typename std::decay<decltype(std::declval<std::ostream>() << std::declval<typename status_code<DomainType>::value_type>())>::type>::value, bool>::type = true>
+inline std::ostream &operator<<(std::ostream &s, const status_code<DomainType> &v)
+{
+  if(v.empty())
+  {
+    return s << "(empty)";
+  }
+  return s << v.domain().name().c_str() << ": " << v.value();
+}
+
+/*! Print the erased status code to a `std::ostream &`.
+*/
+template <class ErasedType> inline std::ostream &operator<<(std::ostream &s, const status_code<erased<ErasedType>> &v)
+{
+  if(v.empty())
+  {
+    return s << "(empty)";
+  }
+  return s << v.domain().name().c_str() << ": " << v.message().c_str();
+}
+
+/*! Print the generic code to a `std::ostream &`.
+*/
+inline std::ostream &operator<<(std::ostream &s, const generic_code &v)
+{
+  if(v.empty())
+  {
+    return s << "(empty)";
+  }
+  return s << v.domain().name().c_str() << ": " << v.message().c_str();
+}
+
+BOOST_OUTCOME_SYSTEM_ERROR2_NAMESPACE_END
+
+#endif