diff --git a/TTKModule/TTKText/TTKChardet/checker.cpp b/TTKModule/TTKText/TTKChardet/checker.cpp
index 1354fd6..006589a 100644
--- a/TTKModule/TTKText/TTKChardet/checker.cpp
+++ b/TTKModule/TTKText/TTKChardet/checker.cpp
@@ -6,3 +6,7 @@ CheckerBase::CheckerBase(const string &name)
 
 }
 
+CheckerBase::~CheckerBase()
+{
+
+}
\ No newline at end of file
diff --git a/TTKModule/TTKText/TTKChardet/checker.h b/TTKModule/TTKText/TTKChardet/checker.h
index 565609a..75d7c43 100644
--- a/TTKModule/TTKText/TTKChardet/checker.h
+++ b/TTKModule/TTKText/TTKChardet/checker.h
@@ -29,6 +29,8 @@ class TTK_CORE_EXPORT CheckerBase
 {
 public:
     CheckerBase(const string &name);
+    virtual ~CheckerBase();
+    
     virtual bool detect(const string &str) const = 0;
 
 private:
diff --git a/ttkglobal.h b/ttkglobal.h
index bbfb12f..3df8329 100644
--- a/ttkglobal.h
+++ b/ttkglobal.h
@@ -40,6 +40,29 @@
 #  define TTK_NO_WINEXTRAS
 #endif
 
+#ifndef qPrintable
+#define qPrintable(s) QString(s).toLocal8Bit().constData()
+#endif
+
+#ifndef qUtf8Printable
+#define qUtf8Printable(s) QString(s).toUtf8().constData()
+#endif
+
+#if !TTK_QT_VERSION_CHECK(5,7,0)
+#define TTK_AS_CONST
+// this adds const to non-const objects (like std::as_const)
+#ifndef Q_CC_MSVC
+template <typename T>
+Q_DECL_CONSTEXPR typename std::add_const<T>::type &qAsConst(T &t) noexcept { return t; }
+// prevent rvalue arguments:
+template <typename T>
+void qAsConst(const T &&) = delete;
+#else
+template <typename T>
+Q_DECL_CONSTEXPR typename std::add_const<T>::type &qAsConst(T &t) { return t; }
+#endif
+#endif
+
 //
 #ifdef QT_DEBUG
 #   define TTK_DEBUG
diff --git a/ttkprivate.h b/ttkprivate.h
index e2054e3..a9cc766 100644
--- a/ttkprivate.h
+++ b/ttkprivate.h
@@ -20,6 +20,8 @@
  ================================================= */
 
 
+#define TTK_CREATE_PRIVATE(Class) (*new Class##Private)
+
 #define TTK_DECLARE_PRIVATE(Class) \
     friend class Class##Private; \
     TTKPrivateInterface<Class, Class##Private> ttk_d;
@@ -27,11 +29,13 @@
 #define TTK_DECLARE_PUBLIC(Class) \
     friend class Class;
 
-#define TTK_INIT_PRIVATE \
+#define TTK_INIT_PRIVATE(Class) \
+    ttk_d.setPrivate(new Class##Private); \
     ttk_d.setPublic(this);
 
-#define TTK_INIT_PUBLIC(Class) \
-    ttk_d.setPrivate(new Class##Private);
+#define TTK_INIT_PRIVATE_D(PVT) \
+    ttk_d.setPrivate(&PVT); \
+    ttk_d.setPublic(this);
 
 #define TTK_D(Class) Class##Private *const d = static_cast<Class##Private *>(ttk_d())
 #define TTK_Q(Class) Class *const q = static_cast<Class *>(ttk_q())
@@ -45,6 +49,7 @@ class TTKPrivate
 public:
     TTKPrivate() { ttk_q_ptr = nullptr; }
     virtual ~TTKPrivate() { }
+
     inline void setPublic(PUB* pub) { ttk_q_ptr = pub; }
 
 protected:
@@ -63,7 +68,8 @@ class TTKPrivateInterface
 {
     friend class TTKPrivate<PUB>;
 public:
-    TTKPrivateInterface() { pvt_ptr = new PVT; }
+    TTKPrivateInterface(PVT* pvt) : pvt_ptr(pvt) { }
+    TTKPrivateInterface() : pvt_ptr(nullptr) { }
     ~TTKPrivateInterface() { delete pvt_ptr; }
 
     inline void setPrivate(PVT* pvt) { delete pvt_ptr; pvt_ptr = pvt; }