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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. const int LOOKUP = 3;
  5.  
  6. struct Box {
  7.     int use;
  8.     int cap;
  9. };
  10.  
  11. void print_vec(const std::vector<Box>& bx) {
  12.     for (const Box &b : bx ) { 
  13.         std::cout << "Box: " << b.use << "/" << b.cap << std::endl;
  14.     }; 
  15. }
  16.  
  17. void find_box(std::vector<Box>& bx, Box*& bptr) {
  18.     for (Box &b : bx) {
  19.         if (b.use == LOOKUP) {
  20.             bptr = &b;
  21.             return;
  22.         }
  23.     }
  24. }
  25.  
  26. int main() {
  27.     std::vector<Box> boxes = { {1,1}, {2,2}, {3,3}, {4,4}, {5,5} };
  28.  
  29.     Box* bptr = nullptr;
  30.  
  31.     print_vec(boxes);
  32.  
  33.     find_box(boxes, bptr);
  34.  
  35.     Box& b = *bptr;
  36.  
  37.     std::cout << std::endl;
  38.     std::cout << "Found box w size: " << b.use << std::endl;
  39.     b.cap = 99;
  40.     std::cout << "New capacity: " << b.cap << std::endl << std::endl;
  41.  
  42.     print_vec(boxes);
  43. }
  44.  
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
Standard input is empty
stdout 
Box: 1/1
Box: 2/2
Box: 3/3
Box: 4/4
Box: 5/5

Found box w size: 3
New capacity: 99

Box: 1/1
Box: 2/2
Box: 3/99
Box: 4/4
Box: 5/5
https://ideone.com/0EfOzu
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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