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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <iterator>
  4. #include <vector>
  5.  
  6. typedef std::vector<std::vector<int>> IntMatrix;
  7.  
  8. void print_matrix(IntMatrix& mat)
  9. {
  10.     std::cout << "[ ";
  11.     std::for_each(mat.begin(), mat.end(), [](const std::vector<int>& row)
  12.     {
  13.     	std::cout << "  [ ";
  14.     	std::for_each(row.begin(), row.end(), [](int i)
  15.     	{
  16.     		std::cout << i << " ";
  17.     	});
  18.     	std::cout << "]\n";
  19.     });
  20.     std::cout << "]\n";
  21. }
  22.  
  23. int main() 
  24. {
  25. 	IntMatrix mat{ {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
  26. 	std::cout << "Before:\n";
  27. 	print_matrix(mat);
  28. 	mat.resize(2);
  29. 	std::for_each(mat.begin(), mat.end(), [](std::vector<int>& v)
  30. 	{
  31. 		v.resize(2);	
  32. 	});
  33. 	std::cout << "After:\n";
  34. 	print_matrix(mat);
  35. 	return 0;
  36. }
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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Before:
[   [ 1 2 3 ]
  [ 4 5 6 ]
  [ 7 8 9 ]
]
After:
[   [ 1 2 ]
  [ 4 5 ]
]
https://ideone.com/KK85Pz
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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