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  1. #include <Eigen/Core>
  2.  
  3. #include <vector>
  4. #include <iostream>
  5.  
  6. using namespace std;
  7. using namespace Eigen;
  8.  
  9. template <typename T>
  10. void log_alignment(const T* t)
  11. {
  12.   unsigned long long address = reinterpret_cast<unsigned long long>(t);  
  13.  
  14.   int max_alignment_check = 256;
  15.   for (; max_alignment_check>1; max_alignment_check/=2)
  16.   {
  17.     if (address % max_alignment_check == 0)
  18.       break;
  19.   }
  20.  
  21.   std::cout << "Address 0x" << std::hex << address << " is " << std::dec << max_alignment_check << " bit aligned.\n";
  22. }
  23.  
  24. struct B
  25. {
  26.   char c;
  27.   Vector4f a;
  28. };
  29.  
  30. int main()
  31. {
  32.   B b;
  33.   B* b_ptr = new B;
  34.   B* b_arr = new B[10];  
  35.   std::vector<B> b_vec(10);
  36.  
  37.   log_alignment(&b);
  38.   log_alignment(b_ptr);
  39.   log_alignment(b_arr);  
  40.   log_alignment(b_vec.data());
  41. }
  42.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:1:22: fatal error: Eigen/Core: No such file or directory
 #include <Eigen/Core>
                      ^
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/rqkjuo
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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