Removed force_flush arg from everywhere. Use flush_on(level) instead

include/spdlog/details/file_helper.h

@@ -31,9 +31,8 @@ public:
     const int open_tries = 5;
     const int open_interval = 10;
 
-    explicit file_helper(bool force_flush) :
-        _fd(nullptr),
-        _force_flush(force_flush)
+    explicit file_helper() :
+        _fd(nullptr)        
     {}
 
     file_helper(const file_helper&) = delete;
@@ -90,10 +89,7 @@ public:
         size_t msg_size = msg.formatted.size();
         auto data = msg.formatted.data();
         if (std::fwrite(data, 1, msg_size, _fd) != msg_size)
-            throw spdlog_ex("Failed writing to file " + os::filename_to_str(_filename), errno);
-
-        if (_force_flush)
-            std::fflush(_fd);
+            throw spdlog_ex("Failed writing to file " + os::filename_to_str(_filename), errno);        
     }
 
     size_t size()
@@ -116,8 +112,7 @@ public:
 
 private:
     FILE* _fd;
-    filename_t _filename;
-    bool _force_flush;
+    filename_t _filename;    
 };
 }
 }