use std::filesystem instead of std::experimental::filesystem

source/paint/detail/image_bmp.hpp

@@ -111,11 +111,11 @@ namespace nana{	namespace paint
 				return true;
 			}
 
-			bool open(const std::experimental::filesystem::path& filename) override
+			bool open(const std::filesystem::path& filename) override
 			{
 				std::ifstream ifs(filename.string(), std::ios::binary);
 
-				auto const bytes = static_cast<unsigned>(std::experimental::filesystem::file_size(filename));
+				auto const bytes = static_cast<unsigned>(std::filesystem::file_size(filename));
 				if (ifs && (bytes > static_cast<int>(sizeof(bitmap_file_header))))
 				{
 					std::unique_ptr<char[]> buffer{ new char[bytes] };

source/paint/detail/image_ico.hpp

@@ -241,7 +241,7 @@ public:
 #endif
 	}
 
-	bool open(const std::experimental::filesystem::path& ico_file) override
+	bool open(const std::filesystem::path& ico_file) override
 	{
 		std::ifstream file(ico_file.string(), std::ios::binary);
 		if (!file.is_open()) return false;
@@ -290,7 +290,7 @@ public:
 #endif
 	}
 private:
-	std::experimental::filesystem::path path_;
+	std::filesystem::path path_;
 #if defined(NANA_WINDOWS)
 	void* native_handle_{nullptr};
 #endif

source/paint/detail/image_ico_resource.hpp

@@ -29,7 +29,7 @@ namespace nana{	namespace paint
 			:public image::image_impl_interface
 		{
 		public:
-			bool open(const std::experimental::filesystem::path& filename) override
+			bool open(const std::filesystem::path& filename) override
 			{
 #if defined(NANA_WINDOWS)
 				SHFILEINFO sfi;

source/paint/detail/image_jpeg.hpp

@@ -47,7 +47,7 @@ namespace nana
 				}
 			}
 		public:
-			bool open(const std::experimental::filesystem::path& jpeg_file) override
+			bool open(const std::filesystem::path& jpeg_file) override
 			{
 				auto fp = ::fopen(to_osmbstr(to_utf8(jpeg_file.native())).c_str(), "rb");
 				if(nullptr == fp) return false;

source/paint/detail/image_png.hpp

@@ -123,7 +123,7 @@ namespace nana
 				delete[] row_ptrs;
 			}
 		public:
-			bool open(const std::experimental::filesystem::path& png_file) override
+			bool open(const std::filesystem::path& png_file) override
 			{
 				auto fp = ::fopen(to_osmbstr(to_utf8(png_file.native())).c_str(), "rb");
 				if(nullptr == fp) return false;

source/paint/image.cpp

@@ -38,7 +38,7 @@
 #include "detail/image_ico_resource.hpp"
 #include "detail/image_ico.hpp"
 
-namespace fs = std::experimental::filesystem;
+namespace fs = std::filesystem;
 
 namespace nana
 {

source/paint/truetype.hpp

@@ -47,7 +47,7 @@ namespace nana
 				std::uint16_t string_offset; //from start of storage area
 			};
 		public:
-			using path_type = ::std::experimental::filesystem::path;
+			using path_type = ::std::filesystem::path;
 
 			truetype(const path_type& filename)
 			{