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  1. #include "stdafx.h"
  2.  
  3. #include <iostream>
  4. #include <vector>
  5.  
  6. using namespace std;
  7.  
  8. class klasa {
  9.   public:
  10.     static int total;
  11.  
  12.     int ilosc;
  13.     klasa(int n) : ilosc(n) {
  14.         std::cout << "created with " << ilosc << "\n";
  15.         total += ilosc;
  16.     };
  17.     klasa(const klasa& drugi) {
  18.         std::cout << "copy created with " << ilosc << "\n";
  19.         ilosc = drugi.ilosc;
  20.         total += ilosc;
  21.     };
  22.     klasa& operator=(const klasa& drugi) {
  23.         std::cout << "assigned with " << ilosc << "\n";
  24.         total -= ilosc;
  25.         ilosc = drugi.ilosc;
  26.         total += ilosc;
  27.         return *this;
  28.     };
  29.     ~klasa() {
  30.         std::cout << "deleted with " << ilosc << "\n";
  31.         total -= ilosc;
  32.     };
  33. };
  34.  
  35. int klasa::total = 0;
  36.  
  37. int main() {
  38.     vector<klasa> vec;
  39.     vec.reserve(310);
  40.  
  41.     int suma = 0;
  42.     for (int i = 100; i <= 500; i += 100) {
  43.         suma += i;
  44.         vec.emplace_back(i);
  45.     }
  46.  
  47.     cout << "Suma wrzuconych elementow: " << suma << " Rozmiar vectora: " << vec.size() << endl;
  48.     cout << "klasa::total: " << klasa::total << endl;
  49.  
  50.     cout << "before erase.. \n";
  51.     for (const auto& x : vec)
  52.         std::cout << x.ilosc << "\n";
  53.  
  54.  
  55.     vec.erase(vec.begin(), vec.begin() + 2);
  56.     cout << "after erase.. \n";
  57.     for (const auto& x : vec)
  58.         std::cout << x.ilosc << "\n";
  59.  
  60.     cout << "vec.size() = " << vec.size() << endl;
  61.     cout << "klasa::total = " << klasa::total << endl;
  62.     return 0;
  63. }
Success #stdin #stdout 0s 3464KB
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stdin
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Standard input is empty
stdout
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created with 100
created with 200
created with 300
created with 400
created with 500
Suma wrzuconych elementow: 1500 Rozmiar vectora: 5
klasa::total: 1500
before erase.. 
100
200
300
400
500
assigned with 100
assigned with 200
assigned with 300
deleted with 400
deleted with 500
after erase.. 
300
400
500
vec.size() = 3
klasa::total = 1200
deleted with 300
deleted with 400
deleted with 500
https://ideone.com/WRAL9q
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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