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  1.     #include<iostream>
  2.     #include<vector>
  3.  
  4.     template <typename T> struct Polynomial { std::vector<T> data; };
  5.  
  6.     template <typename T> 
  7.     std::ostream& operator<<(std::ostream& o,const Polynomial<T>& pol) {
  8.     	const auto& data = pol.data;
  9.     	auto power = [](int n){ 
  10.             return (n==0) ? "" : (n==1) ? "x" : "x^" + std::to_string(n);
  11.         };
  12.     	auto sign = [&](int i){ 
  13.     		return (pol.data[i]<0 || i==pol.data.size()-1) ? "" : "+";
  14.     	}; 
  15.     	// RELY ON UNSIGNED OVERFLOW FOR THE LOOP CONDITION !!!
  16.         for (size_t i = pol.data.size()-1; i < pol.data.size(); i-- ) {
  17.             o << sign(i) << pol.data[i] << power(i); 
  18.         }
  19.         return o;
  20.     }
  21. //
  22. template <typename T> struct Matrix {
  23.       using element_type = T;
  24.       using row_type = std::vector<element_type> ;
  25.       using data_type = std::vector<row_type> ;
  26.       Matrix(int rows, int cols, T const & init) : data(data_type(rows,row_type(cols,init))) {}
  27.       data_type data;
  28. };
  29.  
  30.     template <typename T> std::ostream& operator<<(std::ostream& o,const std::vector<T>& v) {
  31.     	for (auto& x : v) o << x << "\t";
  32.     	return o;
  33.     }
  34.     template <typename T> std::ostream& operator<<(std::ostream& o,const Matrix<T>& mat) {
  35.     	for (const auto& row : mat.data) o << row << "\n";
  36.     	return o;
  37.     }
  38.  
  39.     int main() { 
  40.       using Matrix = Matrix<Polynomial<double>>;
  41.       Polynomial<double> p1{{1,2}};
  42.       Matrix mp(2,3,p1);
  43.       std::cout << mp;
  44.       return 0;
  45.     }
Success #stdin #stdout 0s 4320KB
comments (?)
stdin 
Standard input is empty
stdout 
2x+1	2x+1	2x+1	
2x+1	2x+1	2x+1
https://ideone.com/n00bqn
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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