use experimental filesystem path for Ubuntu 18.04

src/Configuration.hpp

@@ -32,7 +32,7 @@ class Configuration : public Node
 private:
 
     Animation auto_refresher = Animation(std::bind(&Configuration::refresh, this));
-    std::filesystem::file_time_type config_modification_time = std::filesystem::file_time_type::clock::now();
+    fs::file_time_type config_modification_time = fs::file_time_type::clock::now();
     std::vector<fs::path> files_to_refresh;
 
     /*!
@@ -267,11 +267,11 @@ namespace glm
 }
 
 /* Extend std::filesystem so nlohmann::json can read and write std::filesystem::path */
-// #if defined(__MINGW32__)
-// namespace std::experimental::filesystem
-// #else
+#if defined(__UBUNTU18__)
+namespace std::experimental::filesystem
+#else
 namespace std::filesystem
-// #endif
+#endif
 {
     template <typename T>
     void to_json(nlohmann::json& j, const path& p)

src/Game.cpp

@@ -53,7 +53,7 @@ Game::Game(std::initializer_list<std::string> configuration_merge)
 
     /* Log the current working directory as seen by std::filesystem */
     std::ostringstream log_message;
-    log_message << "Current path as seen by std::filesystem is " << std::filesystem::current_path();
+    log_message << "Current path as seen by std::filesystem is " << fs::current_path();
     sb::Log::log(log_message);
 
     /* Load the key mappings into the input manager object */

src/filesystem.hpp

@@ -1,10 +1,10 @@
 #pragma once
 
-/* MinGW filesystem library is in another location */
-// #if defined(__MINGW32__)
-// #include <experimental/filesystem>
-// namespace fs = std::experimental::filesystem;
-// #else
+/* C++17's filesystem library is still experimental in Ubuntu 18.04's clang-10 */
+#if defined(__UBUNTU18__)
+#include <experimental/filesystem>
+namespace fs = std::experimental::filesystem;
+#else
 #include <filesystem>
 namespace fs = std::filesystem;
-// #endif
+#endif