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  1. #include <iostream>
  2. #include <array>
  3. #include <memory>
  4.  
  5. std::unique_ptr<float[]> data(new float[40]());
  6.  
  7. struct LinhaSobre4f
  8. {
  9.     LinhaSobre4f(float * pos_begin, size_t size_):
  10.         pos0(pos_begin),
  11.         size_(size_){}
  12.     std::array<float, 4> & operator[](size_t i)const
  13.     {
  14.         std::array<float,4> * r = 
  15.             reinterpret_cast<std::array<float,4>*> (pos0+(4*i));
  16.         return *r;
  17.     }
  18.     size_t size()const
  19.     {
  20.     	return size_;
  21.     }
  22. private:
  23.     float * pos0;
  24.     size_t size_;
  25. };
  26.  
  27. int main() {
  28. 	LinhaSobre4f l(data.get()+(3*4), 4);
  29. 	//assigning from container
  30.     	for(size_t i = 0; i < l.size(); i++)
  31.     		l[i] = { {1.5f, 2.5f, 3.5f, 4.5f} };
  32. 	//printing from data itself
  33.     	for(size_t i = 0; i < 10; i++)
  34.     	{
  35.     		std::cout << "f4 " << i << " : " ;
  36.     		for(size_t j = 0; j < 4; j++)
  37.     			std::cout << data[i*4+j] << " ";
  38.     		std::cout << std::endl;
  39.     	}
  40. 	return 0;
  41. }
Success #stdin #stdout 0s 3412KB
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stdin
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Standard input is empty
stdout
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f4 0 : 0 0 0 0 
f4 1 : 0 0 0 0 
f4 2 : 0 0 0 0 
f4 3 : 1.5 2.5 3.5 4.5 
f4 4 : 1.5 2.5 3.5 4.5 
f4 5 : 1.5 2.5 3.5 4.5 
f4 6 : 1.5 2.5 3.5 4.5 
f4 7 : 0 0 0 0 
f4 8 : 0 0 0 0 
f4 9 : 0 0 0 0
https://ideone.com/mB6s81
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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