add boost on mac

macx64/include/boost/iostreams/detail/adapter/non_blocking_adapter.hpp

@@ -0,0 +1,62 @@
+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2005-2007 Jonathan Turkanis
+// 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.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+#ifndef BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED
+#define BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED
+
+#include <boost/iostreams/detail/ios.hpp>  // streamsize, seekdir, openmode.
+#include <boost/iostreams/read.hpp>
+#include <boost/iostreams/seek.hpp>
+#include <boost/iostreams/traits.hpp>
+#include <boost/iostreams/write.hpp>
+
+namespace boost { namespace iostreams {
+
+template<typename Device>
+class non_blocking_adapter {
+public:
+    typedef typename char_type_of<Device>::type char_type;
+    struct category
+        : mode_of<Device>::type, device_tag
+        { };
+    explicit non_blocking_adapter(Device& dev) : device_(dev) { }
+    std::streamsize read(char_type* s, std::streamsize n)
+    { 
+        std::streamsize result = 0;
+        while (result < n) {
+            std::streamsize amt = iostreams::read(device_, s + result, n - result);
+            if (amt == -1)
+                break;
+            result += amt;
+        }
+        return result != 0 ? result : -1;
+    }
+    std::streamsize write(const char_type* s, std::streamsize n)
+    { 
+        std::streamsize result = 0;
+        while (result < n) {
+            std::streamsize amt = 
+                iostreams::write(device_, s + result, n - result);
+            // write errors, like EOF on read, need to be handled.
+            if (amt == -1)
+                break;
+            result += amt;
+        }
+        return result;    
+    }
+    std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
+                         BOOST_IOS::openmode which = 
+                             BOOST_IOS::in | BOOST_IOS::out )
+    { return iostreams::seek(device_, off, way, which); }
+public:
+    non_blocking_adapter& operator=(const non_blocking_adapter&);
+    Device& device_;
+};
+
+} } // End namespace iostreams.
+
+#endif // #ifndef BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED