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  1. #include <vector>
  2. #include <iostream>
  3.  
  4. using foo = std::vector<double>;
  5.  
  6. int main()
  7. {
  8.     std::vector<foo> Vfoo(3);
  9.  
  10. 	Vfoo[0].resize(20);
  11.     Vfoo[1].resize(1);
  12.  
  13.     for ( unsigned i = 0; i<20; ++i)
  14.         Vfoo[2].push_back(3.14*i) ;
  15.  
  16.     std::cout << "Vfoo[0]:\n";    
  17.     std::cout << "\tsizeof = " << sizeof(Vfoo[0]) << '\n' ;
  18.     std::cout << "\telements stored = " << Vfoo[0].size() << '\n' ;
  19.     std::cout << "\tcapacity = " << Vfoo[0].capacity() << "\n\n" ;
  20.  
  21.     std::cout << "Vfoo[1]:\n";
  22.     std::cout << "\tsizeof = " << sizeof(Vfoo[1]) << '\n' ;
  23.     std::cout << "\telements stored = " << Vfoo[1].size() << '\n' ;
  24.     std::cout << "\tcapacity = " << Vfoo[1].capacity() << "\n\n" ;
  25.  
  26.     std::cout << "Vfoo[2]:\n";
  27.     std::cout << "\tsizeof = " << sizeof(Vfoo[2]) << '\n' ;
  28.     std::cout << "\telements stored = " << Vfoo[2].size() << '\n' ;
  29.     std::cout << "\tcapacity = " << Vfoo[2].capacity() << '\n' ;
  30. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
Standard input is empty
stdout 
Vfoo[0]:
	sizeof = 12
	elements stored = 20
	capacity = 20

Vfoo[1]:
	sizeof = 12
	elements stored = 1
	capacity = 1

Vfoo[2]:
	sizeof = 12
	elements stored = 20
	capacity = 32
https://ideone.com/GDtnTy
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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