Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 12.10 (quantal)

IDE(s):

Qt Creator 2.5.2

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.7.2

Libraries used:

STL: GNU ISO C++ Library, version 4.7.2

Qt project file: CppGreaterThan.pro


TEMPLATE = app

CONFIG += console

CONFIG -= qt

QMAKE_CXXFLAGS += -Wall -Wextra -Weffc++ -Werror

SOURCES += main.cpp

main.cpp


#include <algorithm>

#include <cassert>

#include <functional>

#include <numeric>

#include <vector>



//From http://www.richelbilderbeek.nl/CppFunctorGreaterThan.htm

#pragma GCC diagnostic ignored "-Weffc++"

struct GreaterThan : public std::unary_function<bool,int>

{

  explicit GreaterThan(const int x) : m_x(x) {}

  bool operator()(const int x) const

  {

    return x > m_x;

  }



  private:

  int m_x;

};

#pragma GCC diagnostic pop





const std::vector<int> CreateVector()

{

  std::vector<int> v;

  v.push_back(0);

  v.push_back(1);

  v.push_back(2);

  std::random_shuffle(v.begin(),v.end());

  return v;

}





int main()

{

  const std::vector<int> v = CreateVector();

  assert(std::count_if(v.begin(),v.end(),GreaterThan(-1))==3);

  assert(std::count_if(v.begin(),v.end(),GreaterThan( 0))==2);

  assert(std::count_if(v.begin(),v.end(),GreaterThan( 1))==1);

  assert(std::count_if(v.begin(),v.end(),GreaterThan( 2))==0);



  assert(std::count_if(v.begin(),v.end(),std::not1(GreaterThan(-2)))==0);

  assert(std::count_if(v.begin(),v.end(),std::not1(GreaterThan(-1)))==0);

  assert(std::count_if(v.begin(),v.end(),std::not1(GreaterThan( 0)))==1);

  assert(std::count_if(v.begin(),v.end(),std::not1(GreaterThan( 1)))==2); //FAILS???

  assert(std::count_if(v.begin(),v.end(),std::not1(GreaterThan( 2)))==3);

}

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(C++) GreaterThan

Technical facts

Qt project file: CppGreaterThan.pro

main.cpp