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  1. #include <iostream> // for std::cout and std::endl
  2. #include <cstdio> // for getchar()
  3. #include <memory> // for std::shared_ptr
  4. #include <deque> // for std::deque
  5. #include <algorithm> // for std::earse and std::remove_if
  6.  
  7. class A
  8. {
  9.     private:
  10.         int _i;
  11.         double _d;
  12.     public:
  13.         A(int i, double d)
  14.         {
  15.             _i = i;
  16.             _d = d;
  17.         }
  18.         int geti()const
  19.         {
  20.             return _i;
  21.         }
  22.         double getValueOnWhichToCheck()const
  23.         {
  24.             return _d;
  25.         }
  26. };
  27.  
  28. typedef std::shared_ptr<A> A_shared_ptr;
  29. typedef std::deque<A_shared_ptr> list_type;
  30.  
  31. void PrintDeque(list_type & dq)
  32. {
  33.     if (0 ==  dq.size())
  34.     {
  35.         std::cout << "Empty deque." << std::endl;
  36.     }
  37.     else
  38.     {
  39.         for (int i = 0 ; i < dq.size() ; ++i)
  40.         {
  41.             std::cout << i+1 << "\t" << dq[i] << std::endl;
  42.         }
  43.     }
  44. }
  45.  
  46. class B
  47. {
  48.     public:
  49.         double getThreshold() // Non constant for a reason as in real code it isn't
  50.         {
  51.             return 24.987; // comes from a calculation not needed here so I return a constant.
  52.         }
  53.         bool Predicate(const std::shared_ptr<A>& a)
  54.         {
  55.             return a->getValueOnWhichToCheck() >= getThreshold();
  56.         }
  57.         void DoStuff()
  58.         {
  59.             A_shared_ptr pT1 = std::make_shared<A>(A(2,      -6.899987));
  60.             A_shared_ptr pT2 = std::make_shared<A>(A(876,    889.878762));
  61.             A_shared_ptr pT3 = std::make_shared<A>(A(-24,    48.98924));
  62.             A_shared_ptr pT4 = std::make_shared<A>(A(78,     -6654.98980));
  63.             A_shared_ptr pT5 = std::make_shared<A>(A(6752,   3.141594209));
  64.             list_type dq = {pT1,pT2,pT3,pT4,pT5};
  65.             PrintDeque(dq);
  66.             dq.erase(std::remove_if(dq.begin(), dq.end(), std::bind(&B::Predicate, this, std::placeholders::_1)), dq.end());
  67.             PrintDeque(dq);
  68.         }
  69. };
  70.  
  71. int main()
  72. {
  73.     B * pB = new B();
  74.     pB->DoStuff();
  75.     getchar();
  76. }
Success #stdin #stdout 0s 3484KB
comments (?)
stdin
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Standard input is empty
stdout
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1	0x865ba2c
2	0x865ba4c
3	0x865ba6c
4	0x865ba8c
5	0x865baac
1	0x865ba2c
2	0x865ba8c
3	0x865baac
https://ideone.com/0StRcw
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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