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  1.     #include <iostream>
  2.     #include <vector>
  3.     using namespace std;
  4.  
  5.     template<typename T>
  6.     struct Params : public std::vector<T>
  7.     {
  8.         template<typename V> // avoids fallback to language-defined behavior
  9.         inline Params<T>& operator,(const V& value)
  10.         {
  11.             this->push_back(value);
  12.             return *this;
  13.         }
  14.     };
  15.  
  16.     void printParams(const Params<int>& params = Params<int>())
  17.     {
  18.         cout << "[";
  19.  
  20.         for (size_t i = 0; i < params.size(); ++i)
  21.         {
  22.             cout << (i == 0 ? "" : ", ");
  23.             cout << params[i];
  24.         }
  25.  
  26.         cout << "]" << endl;
  27.     }
  28.  
  29.     int main()
  30.     {
  31.         // No params
  32.         printParams(); // []
  33.  
  34.         // No params with explicit empty params
  35.         printParams(Params<int>()); // []
  36.  
  37.         // Some params
  38.         printParams((Params<int>(), 1, 2, 3)); // [1, 2, 3]
  39.  
  40.         // compile-time error: invalid conversion from `const char[4]` to `int`
  41.         // printParams((Params<int>(), 1, 2, 3, "error"));
  42.     }
Success #stdin #stdout 0s 4292KB
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Standard input is empty
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[]
[]
[1, 2, 3]
https://ideone.com/KjZxbT
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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