diff --git a/src/app/container/container.pri b/src/app/container/container.pri
index a9e5de22f..2aca23641 100644
--- a/src/app/container/container.pri
+++ b/src/app/container/container.pri
@@ -23,4 +23,5 @@ HEADERS += \
     container/vcurvelength.h \
     container/varclength.h \
     container/vlinelength.h \
-    container/vsplinelength.h
+    container/vsplinelength.h \
+    container/vinternalvariable_p.h
diff --git a/src/app/container/varclength.cpp b/src/app/container/varclength.cpp
index f05805c86..cbd815e1d 100644
--- a/src/app/container/varclength.cpp
+++ b/src/app/container/varclength.cpp
@@ -34,14 +34,14 @@
 VArcLength::VArcLength()
     :VCurveLength()
 {
-    type = VarType::ArcLength;
+    SetType(VarType::ArcLength);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
 VArcLength::VArcLength(const quint32 &id, const quint32 &parentId, const VAbstractCurve *arc)
     :VCurveLength(id, parentId, arc)
 {
-    type = VarType::ArcLength;
+    SetType(VarType::ArcLength);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/container/vcontainer.cpp b/src/app/container/vcontainer.cpp
index 98ca648b6..94c2f21ae 100644
--- a/src/app/container/vcontainer.cpp
+++ b/src/app/container/vcontainer.cpp
@@ -96,12 +96,9 @@ void VContainer::setData(const VContainer &data)
     heightName = data.HeightName();
     {
         ClearGObjects();
-        const QHash<quint32, VGObject*> *obj = data.DataGObjects();
-        SCASSERT(obj != nullptr);
-        QHashIterator<quint32, VGObject*> i(*obj);
-        while (i.hasNext())
+        QHash<quint32, VGObject*>::const_iterator i;
+        for (i = data.gObjects.constBegin(); i != data.gObjects.constEnd(); ++i)
         {
-            i.next();
             switch (i.value()->getType())
             {
                 case (GOType::Arc):
@@ -125,12 +122,9 @@ void VContainer::setData(const VContainer &data)
 
     {
         ClearVariables();
-        const QHash<QString, VInternalVariable*> *vars = data.DataVariables();
-        SCASSERT(vars != nullptr);
-        QHashIterator<QString, VInternalVariable*> i(*vars);
-        while (i.hasNext())
+        QHash<QString, VInternalVariable*>::const_iterator i;
+        for (i = data.variables.constBegin(); i != data.variables.constEnd(); ++i)
         {
-            i.next();
             switch (i.value()->GetType())
             {
                 case (VarType::Measurement):
diff --git a/src/app/container/vcurvelength.cpp b/src/app/container/vcurvelength.cpp
index a9c0cf389..6d2d62e08 100644
--- a/src/app/container/vcurvelength.cpp
+++ b/src/app/container/vcurvelength.cpp
@@ -34,17 +34,17 @@
 VCurveLength::VCurveLength()
     :VInternalVariable(), id(NULL_ID), parentId(NULL_ID)
 {
-    type = VarType::Unknown;
+    SetType(VarType::Unknown);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
 VCurveLength::VCurveLength(const quint32 &id, const quint32 &parentId, const VAbstractCurve *curve)
     :VInternalVariable(), id(id), parentId(parentId)
 {
-    type = VarType::Unknown;
+    SetType(VarType::Unknown);
     SCASSERT(curve != nullptr);
-    name = curve->name();
-    value = qApp->fromPixel(curve->GetLength());
+    SetName(curve->name());
+    SetValue(qApp->fromPixel(curve->GetLength()));
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/container/vincrement.cpp b/src/app/container/vincrement.cpp
index e45888bcd..4bfce0166 100644
--- a/src/app/container/vincrement.cpp
+++ b/src/app/container/vincrement.cpp
@@ -36,7 +36,7 @@
 VIncrement::VIncrement()
     :VVariable(), id(NULL_ID)
 {
-    type = VarType::Increment;
+    SetType(VarType::Increment);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -52,7 +52,7 @@ VIncrement::VIncrement()
 VIncrement::VIncrement(const QString &name, quint32 id, qreal base, qreal ksize, qreal kheight, QString description)
     :VVariable(name, base, ksize, kheight, description), id(id)
 {
-    type = VarType::Increment;
+    SetType(VarType::Increment);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/container/vinternalvariable.cpp b/src/app/container/vinternalvariable.cpp
index df24534d4..cd2244cce 100644
--- a/src/app/container/vinternalvariable.cpp
+++ b/src/app/container/vinternalvariable.cpp
@@ -27,15 +27,16 @@
  *************************************************************************/
 
 #include "vinternalvariable.h"
+#include "vinternalvariable_p.h"
 
 //---------------------------------------------------------------------------------------------------------------------
 VInternalVariable::VInternalVariable()
-    :type(VarType::Unknown), value(0), name(QString())
+    :d(new VInternalVariableData)
 {}
 
 //---------------------------------------------------------------------------------------------------------------------
 VInternalVariable::VInternalVariable(const VInternalVariable &var)
-    :type(var.GetType()), value(var.GetValue()), name(var.GetName())
+    :d(var.d)
 {}
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -45,9 +46,7 @@ VInternalVariable &VInternalVariable::operator=(const VInternalVariable &var)
     {
         return *this;
     }
-    this->type = var.GetType();
-    this->value = var.GetValue();
-    this->name = var.GetName();
+    d = var.d;
     return *this;
 }
 
@@ -61,3 +60,45 @@ bool VInternalVariable::Filter(quint32 id)
     Q_UNUSED(id);
     return false;
 }
+
+//---------------------------------------------------------------------------------------------------------------------
+qreal VInternalVariable::GetValue() const
+{
+    return d->value;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+qreal *VInternalVariable::GetValue()
+{
+    return &d->value;
+}
+
+void VInternalVariable::SetValue(const qreal &value)
+{
+    d->value = value;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+QString VInternalVariable::GetName() const
+{
+    return d->name;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+void VInternalVariable::SetName(const QString &name)
+{
+    d->name = name;
+}
+
+//---------------------------------------------------------------------------------------------------------------------
+VarType VInternalVariable::GetType() const
+{
+    return d->type;
+}
+
+
+//---------------------------------------------------------------------------------------------------------------------
+void VInternalVariable::SetType(const VarType &type)
+{
+    d->type = type;
+}
diff --git a/src/app/container/vinternalvariable.h b/src/app/container/vinternalvariable.h
index cc34ff963..939a6d272 100644
--- a/src/app/container/vinternalvariable.h
+++ b/src/app/container/vinternalvariable.h
@@ -30,8 +30,10 @@
 #define VINTERNALVARIABLE_H
 
 #include <QString>
+#include <QSharedDataPointer>
+#include "../options.h"
 
-enum class VarType : char { Measurement, Increment, LineLength, SplineLength, ArcLength, LineAngle, Unknown };
+class VInternalVariableData;
 
 class VInternalVariable
 {
@@ -43,41 +45,17 @@ public:
 
     qreal        GetValue() const;
     qreal*       GetValue();
+    void         SetValue(const qreal &value);
+
     QString      GetName() const;
+    void         SetName(const QString &name);
+
     VarType      GetType() const;
+    void         SetType(const VarType &type);
 
     virtual bool Filter(quint32 id);
-protected:
-    VarType type;
-
-    /** @brief value variable's value */
-    qreal   value;
-
-    QString name;
+private:
+    QSharedDataPointer<VInternalVariableData> d;
 };
 
-//---------------------------------------------------------------------------------------------------------------------
-inline qreal VInternalVariable::GetValue() const
-{
-    return value;
-}
-
-//---------------------------------------------------------------------------------------------------------------------
-inline qreal *VInternalVariable::GetValue()
-{
-    return &value;
-}
-
-//---------------------------------------------------------------------------------------------------------------------
-inline QString VInternalVariable::GetName() const
-{
-    return name;
-}
-
-//---------------------------------------------------------------------------------------------------------------------
-inline VarType VInternalVariable::GetType() const
-{
-    return type;
-}
-
 #endif // VINTERNALVARIABLE_H
diff --git a/src/app/container/vinternalvariable_p.h b/src/app/container/vinternalvariable_p.h
new file mode 100644
index 000000000..c41c2b4cc
--- /dev/null
+++ b/src/app/container/vinternalvariable_p.h
@@ -0,0 +1,58 @@
+/************************************************************************
+ **
+ **  @file   vinternalvariable_p.h
+ **  @author Roman Telezhynskyi <dismine(at)gmail.com>
+ **  @date   20 8, 2014
+ **
+ **  @brief
+ **  @copyright
+ **  This source code is part of the Valentine project, a pattern making
+ **  program, whose allow create and modeling patterns of clothing.
+ **  Copyright (C) 2014 Valentina project
+ **  <https://bitbucket.org/dismine/valentina> All Rights Reserved.
+ **
+ **  Valentina is free software: you can redistribute it and/or modify
+ **  it under the terms of the GNU General Public License as published by
+ **  the Free Software Foundation, either version 3 of the License, or
+ **  (at your option) any later version.
+ **
+ **  Valentina is distributed in the hope that it will be useful,
+ **  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ **  GNU General Public License for more details.
+ **
+ **  You should have received a copy of the GNU General Public License
+ **  along with Valentina.  If not, see <http://www.gnu.org/licenses/>.
+ **
+ *************************************************************************/
+
+#ifndef VINTERNALVARIABLE_P_H
+#define VINTERNALVARIABLE_P_H
+
+#include <QSharedData>
+#include "../options.h"
+
+class VInternalVariableData : public QSharedData
+{
+public:
+
+    VInternalVariableData()
+        :type(VarType::Unknown), value(0), name(QString())
+    {}
+
+    VInternalVariableData(const VInternalVariableData &var)
+        :QSharedData(var), type(var.type), value(var.value), name(var.name)
+    {}
+
+    virtual ~VInternalVariableData() {}
+
+    VarType type;
+
+    /** @brief value variable's value */
+    qreal   value;
+
+    QString name;
+};
+
+
+#endif // VINTERNALVARIABLE_P_H
diff --git a/src/app/container/vlineangle.cpp b/src/app/container/vlineangle.cpp
index 01396d224..c05fcea6d 100644
--- a/src/app/container/vlineangle.cpp
+++ b/src/app/container/vlineangle.cpp
@@ -36,19 +36,19 @@
 VLineAngle::VLineAngle()
     :VInternalVariable(), p1Id(NULL_ID), p2Id(NULL_ID)
 {
-    type = VarType::LineAngle;
+    SetType(VarType::LineAngle);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
 VLineAngle::VLineAngle(const VPointF *p1, const quint32 &p1Id, const VPointF *p2, const quint32 &p2Id)
     :VInternalVariable(), p1Id(p1Id), p2Id(p2Id)
 {
-    type = VarType::LineAngle;
+    SetType(VarType::LineAngle);
 
     SCASSERT(p1 != nullptr);
     SCASSERT(p2 != nullptr);
 
-    name = QString(angleLine_+"%1_%2").arg(p1->name(), p2->name());
+    SetName(QString(angleLine_+"%1_%2").arg(p1->name(), p2->name()));
     SetValue(p1, p2);
 }
 
@@ -85,5 +85,5 @@ void VLineAngle::SetValue(const VPointF *p1, const VPointF *p2)
 {
     SCASSERT(p1 != nullptr);
     SCASSERT(p2 != nullptr);
-    value = QLineF(p1->toQPointF(), p2->toQPointF()).angle();
+    VInternalVariable::SetValue(QLineF(p1->toQPointF(), p2->toQPointF()).angle());
 }
diff --git a/src/app/container/vlinelength.cpp b/src/app/container/vlinelength.cpp
index 886d63a89..7ba87a8b3 100644
--- a/src/app/container/vlinelength.cpp
+++ b/src/app/container/vlinelength.cpp
@@ -36,7 +36,7 @@
 VLengthLine::VLengthLine()
     :VInternalVariable(), p1Id(NULL_ID), p2Id(NULL_ID)
 {
-    type = VarType::LineLength;
+    SetType(VarType::LineLength);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -46,8 +46,8 @@ VLengthLine::VLengthLine(const VPointF *p1, const quint32 &p1Id, const VPointF *
     SCASSERT(p1 != nullptr);
     SCASSERT(p2 != nullptr);
 
-    type = VarType::LineLength;
-    name = QString(line_+"%1_%2").arg(p1->name(), p2->name());
+    SetType(VarType::LineLength);
+    SetName(QString(line_+"%1_%2").arg(p1->name(), p2->name()));
     SetValue(p1, p2);
 }
 
@@ -85,5 +85,5 @@ void VLengthLine::SetValue(const VPointF *p1, const VPointF *p2)
     SCASSERT(p1 != nullptr);
     SCASSERT(p2 != nullptr);
 
-    value = qApp->fromPixel(QLineF(p1->toQPointF(), p2->toQPointF()).length());
+    VInternalVariable::SetValue(qApp->fromPixel(QLineF(p1->toQPointF(), p2->toQPointF()).length()));
 }
diff --git a/src/app/container/vmeasurement.cpp b/src/app/container/vmeasurement.cpp
index a93ef1a41..183876659 100644
--- a/src/app/container/vmeasurement.cpp
+++ b/src/app/container/vmeasurement.cpp
@@ -37,7 +37,7 @@
 VMeasurement::VMeasurement()
     :VVariable(), gui_text(QString()), _tagName(QString())
 {
-    type = VarType::Measurement;
+    SetType(VarType::Measurement);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -55,7 +55,7 @@ VMeasurement::VMeasurement(const QString &name, const qreal &base, const qreal &
                            const QString &gui_text, const QString &description, const QString &tagName)
     :VVariable(name, base, ksize, kheight, description), gui_text(gui_text), _tagName(tagName)
 {
-    type = VarType::Measurement;
+    SetType(VarType::Measurement);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -71,7 +71,7 @@ VMeasurement::VMeasurement(const QString &name, const qreal &base, const QString
                            const QString &tagName)
     :VVariable(name, base, description), gui_text(gui_text), _tagName(tagName)
 {
-    type = VarType::Measurement;
+    SetType(VarType::Measurement);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/container/vsplinelength.cpp b/src/app/container/vsplinelength.cpp
index de7af7520..ae92567e7 100644
--- a/src/app/container/vsplinelength.cpp
+++ b/src/app/container/vsplinelength.cpp
@@ -34,15 +34,15 @@
 VSplineLength::VSplineLength()
     :VCurveLength()
 {
-    type = VarType::SplineLength;
+    SetType(VarType::SplineLength);
 }
 
 VSplineLength::VSplineLength(const quint32 &id, const quint32 &parentId, const QString &name, const qreal &value)
     :VCurveLength()
 {
-    type = VarType::SplineLength;
-    this->name = name;
-    this->value = value;
+    SetType(VarType::SplineLength);
+    SetName(name);
+    SetValue(value);
     this->id = id;
     this->parentId = parentId;
 }
@@ -51,7 +51,7 @@ VSplineLength::VSplineLength(const quint32 &id, const quint32 &parentId, const Q
 VSplineLength::VSplineLength(const quint32 &id, const quint32 &parentId, const VAbstractCurve *path)
     :VCurveLength(id, parentId, path)
 {
-    type = VarType::SplineLength;
+    SetType(VarType::SplineLength);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/container/vvariable.cpp b/src/app/container/vvariable.cpp
index dfa30be83..2e322fcf9 100644
--- a/src/app/container/vvariable.cpp
+++ b/src/app/container/vvariable.cpp
@@ -35,7 +35,7 @@ VVariable::VVariable()
     :VInternalVariable(), base(0), ksize(0), kheight(0), description(QString())
 {
     Init();
-    value = base;
+    VInternalVariable::SetValue(base);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -43,8 +43,8 @@ VVariable::VVariable(const QString &name, const qreal &base, const qreal &ksize,
                      const QString &description)
     :VInternalVariable(), base(base), ksize(ksize), kheight(kheight), description(description)
 {
-    value = base;
-    this->name = name;
+    VInternalVariable::SetValue(base);
+    SetName(name);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -52,8 +52,8 @@ VVariable::VVariable(const QString &name, const qreal &base, const QString &desc
     :base(base), ksize(0), kheight(0), description(description)
 {
     Init();
-    value = base;
-    this->name = name;
+    VInternalVariable::SetValue(base);
+    SetName(name);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -97,7 +97,7 @@ void VVariable::SetValue(const qreal &size, const qreal &height)
     // Formula for calculation gradation
     const qreal k_size    = ( size - baseSize ) / sizeIncrement;
     const qreal k_height  = ( height - baseHeight ) / heightIncrement;
-    value = base + k_size * ksize + k_height * kheight;
+    VInternalVariable::SetValue(base + k_size * ksize + k_height * kheight);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
diff --git a/src/app/options.h b/src/app/options.h
index 7cfebe1f2..2baec9341 100644
--- a/src/app/options.h
+++ b/src/app/options.h
@@ -80,6 +80,7 @@ enum class Contour : char { OpenContour, CloseContour };
 enum class EquidistantType : char { OpenEquidistant, CloseEquidistant };
 enum class GOType : char { Point, Arc, Spline, SplinePath, Unknown };
 enum class SplinePointPosition : char { FirstPoint, LastPoint };
+enum class VarType : char { Measurement, Increment, LineLength, SplineLength, ArcLength, LineAngle, Unknown };
 
 enum class GHeights : unsigned char { ALL,
                                       H92=92,   H98=98,   H104=104, H110=110, H116=116, H122=122, H128=128, H134=134,