Help global variable

[Exotic_Devel]

I believe this is a matter purely C + +, since my experience with C + + is small.

I have the following code

@
/*

• dynamicuitest.hpp
• This file is part of DynamicUi.so
• Copyright (C) 2014 - Matheus Saraiva
• DynamicUi.so 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 2 of the License, or
• (at your option) any later version.
• DynamicUi.so 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 DynamicUi.so. If not, see http://www.gnu.org/licenses/.
  */

#ifndef DYNAMICUITEST_H

define DYNAMICUITEST_H

#include <QString>
#include <QtTest>
#include "dynamicui.hpp"

class DynamicUiTest : public QObject
{
Q_OBJECT

public:
DynamicUiTest();

private Q_SLOTS:
void testCreateUi();
void testCreateUi_data();
};
#endif
@

@
/*

• dynamicuitest.cpp
• This file is part of DynamicUi.so
• Copyright (C) 2014 - Matheus Saraiva
• DynamicUi.so 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 2 of the License, or
• (at your option) any later version.
• DynamicUi.so 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 DynamicUi.so. If not, see http://www.gnu.org/licenses/.
  */

#include "dynamicuitest.hpp"

QWidget *widtest; // Pointer for object recepted from DynamicUi

DynamicUiTest::DynamicUiTest()
{
}

void DynamicUiTest::testCreateUi()
{
QFETCH(QString, file_ui);
QFETCH(bool, widget);
DynamicUi lui(file_ui); // DynamicUi object
widtest = lui.createUi();

QCOMPARE(widtest->isWidgetType(), widget); // Compare DynamicUi::createUi() return with QWidget type
}

void DynamicUiTest::testCreateUi_data()
{
QTest::addColumn<QString>("file_ui");
QTest::addColumn<bool>("widget");

QTest::newRow("Valid File") << "test.ui" << true; // Valid File
QTest::newRow("Inexistent File") << "inexistent.ui" << true; // Inexistent File
QTest::newRow("Invalid File") << "test_text.ui" << true; // Invalid File
QTest::newRow("Empty Ui File") << "testempty.ui" << true; // Empty File
delete widtest;
}
@

If I move "QWidget * widtest" of dynamicuitest.cpp to dynamicuitest.hpp. Becoming a global variable,

@
/*

• dynamicuitest.hpp
• This file is part of DynamicUi.so
• Copyright (C) 2014 - Matheus Saraiva
• DynamicUi.so 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 2 of the License, or
• (at your option) any later version.
• DynamicUi.so 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 DynamicUi.so. If not, see http://www.gnu.org/licenses/.
  */

#ifndef DYNAMICUITEST_H

define DYNAMICUITEST_H

#include <QString>
#include <QtTest>
#include "dynamicui.hpp"

class DynamicUiTest : public QObject
{
Q_OBJECT

public:
DynamicUiTest();

private:
QWidget *widtest;

private Q_SLOTS:
void testCreateUi();
void testCreateUi_data();
};
#endif
@

fail at runtime.

[Exotic_Devel]

Ok, now I understand the difference Global Variable and Variable of Instance.