Revert changes in xc_functional.h

Author: ahxbcn

source/module_hamilt_general/module_xc/xc_functional.h

@@ -64,34 +64,23 @@ class XC_Functional
 //		func_type, which is as specified in get_func_type
 //		use_libxc, whether to use LIBXC. The rule is to NOT use it for functionals that we already have.
 
-    static int get_func_type()
-    {
-        return func_type;
-    };
+	static int get_func_type();
     static void set_xc_type(const std::string xc_func_in);
 
     // For hybrid functional
     static void set_hybrid_alpha(const double alpha_in);
-    static double get_hybrid_alpha()
-    {
-        return hybrid_alpha;
-    };
-    static bool get_ked_flag()
-    {
-        return ked_flag;
-    };
+    static double get_hybrid_alpha();
     /// Usually in exx caculation, the first SCF loop should be converged with PBE
     static void set_xc_first_loop(const UnitCell& ucell);
 
 	private:
 
 	static std::vector<int> func_id; // libxc id of functional
 	static int func_type; //0:none, 1:lda, 2:gga, 3:mgga, 4:hybrid lda/gga, 5:hybrid mgga
-    static bool ked_flag; // whether the functional has kinetic energy density
-    static bool use_libxc;
+	static bool use_libxc;
 
-    // exx_hybrid_alpha for mixing exx in hybrid functional:
-    static double hybrid_alpha;
+	//exx_hybrid_alpha for mixing exx in hybrid functional:
+	static double hybrid_alpha;
 
 	// added by jghan, 2024-07-07
 	// as a scaling factor for different xc-functionals