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  1. #include <string>
  2. #include <vector>
  3. #include <iostream>
  4.  
  5. template <class T>
  6. class Inventory
  7. {
  8.     public:
  9.         void operator += (const T& b)   { backpack.push_back(b); }
  10.  
  11.         T operator [] (const unsigned& b)
  12.         {
  13.             try 
  14.             {
  15.                return backpack.at(b);
  16.             }
  17.             catch (std::out_of_range& e)
  18.             {
  19.                 throw std::string("Out of Range");
  20.             }
  21.         }
  22.  
  23.         void operator -= (const unsigned& b)
  24.         {
  25.         	try 
  26.         	{
  27.         		backpack.at(b);
  28.                 backpack.erase(backpack.begin() + b);
  29.         	}
  30.         	catch(std::out_of_range& e)
  31.         	{
  32.                 throw std::string("No such element exists.");
  33.         	}
  34.         }
  35.  
  36.     private:
  37.         std::vector<int> backpack;
  38. };
  39.  
  40. using namespace std;
  41.  
  42. int main()
  43. {
  44.     Inventory<int> pack;
  45.     pack += 2;
  46.     pack += 4;
  47.     try
  48.     {
  49.         cout << "It was " << pack[0] << endl;
  50.         cout << "It was " << pack[1] << endl;
  51.         pack -= 0;
  52.         cout << "It is now " << pack[0] << endl;
  53.         pack -= 1; // Segfaults?
  54.     }
  55.     catch (string e)
  56.     {
  57.         cout << "Error: " << e << endl;
  58.     }
  59. }
Success #stdin #stdout 0s 3464KB
comments (?)
stdin 
Standard input is empty
stdout 
It was 2
It was 4
It is now 4
Error: No such element exists.
https://ideone.com/G7dmVd
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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