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  1. #include <stdlib.h>
  2. #include <iostream>
  3. #include <assert.h>
  4.  
  5. template<int Capcity>
  6. class cbuffer
  7. {
  8. public:
  9.     cbuffer() : sz(0), p(0){}
  10.     void push_back(int n)
  11.     {
  12.         buf[p++] = n;
  13.         if (sz < Capcity)
  14.             sz++;
  15.         if (p >= Capcity)
  16.             p = 0;
  17.     }
  18.     int size() const
  19.     {
  20.         return sz;
  21.     }
  22.     int operator[](int n) const
  23.     {
  24.         assert(n < sz);
  25.         n = p - sz + n;
  26.         if (n < 0)
  27.             n += Capcity;
  28.         return buf[n];
  29.     }
  30.     int buf[Capcity];
  31.     int sz, p;
  32. };
  33.  
  34. int main()
  35. {
  36.     cbuffer<5> buf;
  37.  
  38.     // insert random 100 numbers
  39.     for (int i = 0; i < 100; ++i)
  40.         buf.push_back(rand());
  41.  
  42.     // output to cout contents of the circular buffer
  43.     for (int i = 0; i < buf.size(); ++i)
  44.         std::cout << buf[i] << ' ';
  45. }
  46.  
Success #stdin #stdout 0s 15224KB
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stdin
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Standard input is empty
stdout
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1984210012 855636226 1749698586 1469348094 1956297539
https://ideone.com/fqEtoa
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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