updated to filesystem_selector

build/vc2015/nana.vcxproj

@@ -249,6 +249,9 @@
     <ClCompile Include="..\..\source\threads\pool.cpp" />
     <ClCompile Include="..\..\source\unicode_bidi.cpp" />
   </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\include\nana\filesystem\filesystem_selector.hpp" />
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>

build/vc2015/nana.vcxproj.filters

@@ -49,6 +49,9 @@
     <Filter Include="Source Files\paint\detail">
       <UniqueIdentifier>{53feb93f-2b86-4bf5-b2f3-f60ef1bbbf76}</UniqueIdentifier>
     </Filter>
+    <Filter Include="Header Files\filesystem">
+      <UniqueIdentifier>{6caffbf6-c023-4dbf-ba69-cdb49feddb5d}</UniqueIdentifier>
+    </Filter>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\..\source\any.cpp">
@@ -280,4 +283,9 @@
       <Filter>Source Files\gui\detail</Filter>
     </ClCompile>
   </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\..\include\nana\filesystem\filesystem_selector.hpp">
+      <Filter>Header Files\filesystem</Filter>
+    </ClInclude>
+  </ItemGroup>
 </Project>

include/nana/filesystem/filesystem_selector.hpp

@@ -0,0 +1,81 @@
+/**
+*	Nana C++ Library(http://www.nanapro.org)
+*	Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.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)
+*
+*	@file nana\filesystem\filesystem_selector.hpp
+*   @autor by Ariel Vina-Rodriguez:
+*	@brief A "ISO C++" filesystem Implementation selector
+*    The ISO C++ File System Technical Specification is optional.
+*               http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4100.pdf
+*    This is not a workaround, but an user option.
+*    The library maybe available in the std library in use or from Boost (almost compatible)
+*               http://www.boost.org/doc/libs/1_60_0/libs/filesystem/doc/index.htm
+*    or you can choose to use the (partial, but functional) implementation provided by nana.
+*    If you include the file <nana/filesystem/filesystem_selector.hpp>
+*    The selected option will be set by nana into std::experimental::filesystem
+*    By default Nana will use the ISO TS if available, or nana if not.
+*    Boost will be use only if explicitily changed 
+*    nana Now mimic std::experimental::filesystem::v1   (boost v3)
+*    
+*/
+
+#ifndef NANA_FILESYSTEM_SELECTOR
+#define NANA_FILESYSTEM_SELECTOR
+
+#include <nana/config.hpp>
+
+#if defined(NANA_BOOST_FILESYSTEM_AVAILABLE) && ( defined(NANA_BOOST_FILESYSTEM_FORCE) || (defined(STD_FILESYSTEM_NOT_SUPPORTED) && defined(NANA_BOOST_FILESYSTEM_PREFERRED) ) )
+
+#   include <boost/filesystem.hpp>
+	// add boost::filesystem into std::experimental::filesystem
+	namespace std {
+		namespace experimental {
+#       ifdef CXX_NO_INLINE_NAMESPACE
+			using namespace boost::experimental;
+#       else
+			using namespace boost::experimental::v3;
+#       endif
+
+		}
+
+#elif defined(STD_FILESYSTEM_NOT_SUPPORTED)
+
+#   include <nana/filesystem/filesystem.hpp>
+	namespace std {
+		namespace experimental {
+#       ifdef CXX_NO_INLINE_NAMESPACE
+			using namespace nana::experimental;
+#       else
+			using namespace nana::experimental::v1;
+#       endif
+		}
+}
+
+#else
+#    include <filesystem>
+#endif
+
+#ifndef __cpp_lib_experimental_filesystem
+#   define __cpp_lib_experimental_filesystem 1
+#endif
+
+#if defined(NANA_WINDOWS)
+constexpr auto def_root = "C:";
+constexpr auto def_rootstr = "C:\\";
+constexpr auto def_rootname = "Local Drive(C:)";
+#elif defined(NANA_LINUX)
+constexpr auto def_root = "/";
+constexpr auto def_rootstr = "/";
+constexpr auto def_rootname = "Root/";
+#endif
+
+#endif // NANA_FILESYSTEM_SELECTOR             // "Force use of Boost filesystem if available (over ISO)?
+ 
+
+
+
+