Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

GUI application

C++ standard:

C++11

Compiler(s):

G++ 4.9.2

Libraries used:

Qt: version 5.4.1 (32 bit)
STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppStdSortExample2/CppStdSortExample2.pro


# Go ahead and use Qt.Core: it is about as platform-independent as

# the STL and Boost

QT += core



# Go ahead and use Qt.Gui: it is about as platform-independent as

# the STL and Boost. It is needed for QImage

QT += gui



# Don't define widgets: it would defy the purpose of this console

# application to work non-GUI

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



CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app



#

#

# Type of compile

#

#



CONFIG(release, debug|release) {

  DEFINES += NDEBUG NTRACE_BILDERBIKKEL

}



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



unix {

  QMAKE_CXXFLAGS += -Werror

}



SOURCES += main.cpp



win32 {

  INCLUDEPATH += \

    ../../Libraries/boost_1_54_0

}

./CppStdSortExample2/main.cpp


#include <algorithm>

#include <cassert>

#include <string>

#include <vector>



struct MyClass

{

  MyClass(const std::string& s, const int x) : m_s(s), m_x(x) {}

  const std::string& GetS() const noexcept { return m_s; }

  int GetX() const noexcept { return m_x; }

  private:

  std::string m_s;

  int m_x;

};



bool operator<(const MyClass& lhs, const MyClass& rhs)

{

  return lhs.GetX() < rhs.GetX();

}



bool OrderByS(const MyClass& lhs, const MyClass& rhs)

{

  return lhs.GetS() < rhs.GetS();

}



int main()

{

  std::vector<MyClass> v;

  v.push_back(MyClass("five",5));

  v.push_back(MyClass("four",4));

  v.push_back(MyClass("one",1));

  v.push_back(MyClass("six",6));

  v.push_back(MyClass("three",3));

  v.push_back(MyClass("two",2));



  std::sort(v.begin(),v.end()); //Calls operator<



  assert(v[0].GetX() == 1);

  assert(v[1].GetX() == 2);

  assert(v[2].GetX() == 3);

  assert(v[3].GetX() == 4);

  assert(v[4].GetX() == 5);

  assert(v[5].GetX() == 6);



  std::sort(v.begin(),v.end(),OrderByS);



  assert(v[0].GetS() == "five");

  assert(v[1].GetS() == "four");

  assert(v[2].GetS() == "one");

  assert(v[3].GetS() == "six");

  assert(v[4].GetS() == "three");

  assert(v[5].GetS() == "two");

}

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(C++) StdSortExample2

Technical facts

Qt project file: ./CppStdSortExample2/CppStdSortExample2.pro

./CppStdSortExample2/main.cpp