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  1. template <typename T>
  2. class MyVector {
  3. private:
  4.     T* data;
  5.     int capacity;
  6.     int size;
  7.  
  8.     void resize() {
  9.         capacity *= 2;
  10.         T* newData = new T[capacity];
  11.         for (int i = 0; i < size; ++i)
  12.             newData[i] = data[i];
  13.         delete[] data;
  14.         data = newData;
  15.     }
  16.  
  17. public:
  18.     MyVector() : capacity(4), size(0) {
  19.         data = new T[capacity];
  20.     }
  21.  
  22.     void push_back(T value) {
  23.         if (size == capacity)
  24.             resize();
  25.         data[size++] = value;
  26.     }
  27.  
  28.     void pop_back() {
  29.         if (size > 0)
  30.             --size;
  31.     }
  32.  
  33.     void push_front(T value) {
  34.         if (size == capacity)
  35.             resize();
  36.         for (int i = size; i > 0; --i)
  37.             data[i] = data[i - 1];
  38.         data[0] = value;
  39.         ++size;
  40.     }
  41.  
  42.     void pop_front() {
  43.         if (size == 0) return;
  44.         for (int i = 0; i < size - 1; ++i)
  45.             data[i] = data[i + 1];
  46.         --size;
  47.     }
  48.  
  49.     T operator[](int index) const {
  50.         return data[index];
  51.     }
  52.  
  53.     int getSize() const {
  54.         return size;
  55.     }
  56. };
  57.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/uCp5uJ
language:
C++14 (gcc 8.3)
created:
165 days ago
visibility:
secret

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