Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppConstExample2/CppConstExample2.pro


include(../../ConsoleApplication.pri) #Or use the code below

# QT += core

# QT += gui

# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

# CONFIG   += console

# CONFIG   -= app_bundle

# TEMPLATE = app

# CONFIG(release, debug|release) {

#   DEFINES += NDEBUG NTRACE_BILDERBIKKEL

# }

# QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++

# unix {

#   QMAKE_CXXFLAGS += -Werror

# }



SOURCES += main.cpp

./CppConstExample2/main.cpp


#include <cassert>



int main()

{

  //Non-const pointer to non-const int

  {

    int * p = new int(42);

    assert(p);

    assert(*p == 42);

    *p = 24;

    assert(*p == 24);

    delete p;

    p = nullptr;

    assert(!p);

  }

  //Const pointer to non-const int

  {

    int * const p = new int(42);

    assert(p);

    assert(*p == 42);

    *p = 24;

    assert(*p == 24);

    delete p;

    //p = nullptr;

    //assert(!p);

  }

  //Non-const pointer to const int

  {

    const int * p = new int(42);

    assert(p);

    assert(*p == 42);

    //*p = 24;

    //assert(*p == 24);

    delete p;

    p = nullptr;

    assert(!p);

  }

  //Const pointer to const int

  {

    const int * const p = new int(42);

    assert(p);

    assert(*p == 42);

    //*p = 24;

    //assert(*p == 24);

    delete p; //It is still possible to delete p

    //p = nullptr;

    //assert(!p);

  }

}

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(C++) ConstExample2

Technical facts

Qt project file: ./CppConstExample2/CppConstExample2.pro

./CppConstExample2/main.cpp