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  1. #include <iostream>
  2.  
  3. struct A 
  4. { 
  5.     A(int v=1): m(v) {}
  6.     int m; 
  7. };
  8.  
  9. struct B
  10. { 
  11.     B(): m(2) {}
  12.     int m; 
  13. };
  14.  
  15. struct C
  16. { 
  17.     C()
  18.     {
  19.         m = 3;
  20.     }
  21.     int m; 
  22. };
  23.  
  24. struct D
  25. { 
  26.     int m = 11; 
  27. };
  28.  
  29. int main()
  30. {
  31.     using namespace std;
  32.     #define TRACE(arg) cout << #arg ": " << arg.m << endl; 
  33.     A a1;
  34.     TRACE(a1)
  35.     A a2(4); 
  36.     TRACE(a2)
  37.     B b;
  38.     TRACE(b)
  39.     b.m = 5;
  40.     TRACE(b)
  41.     C c;
  42.     TRACE(c)
  43.     c.m = 6;
  44.     TRACE(c)
  45.     D d;
  46.     TRACE(d)
  47.     d.m = 0;
  48.     TRACE(d)
  49.     #undef TRACE
  50. }
  51.  
Success #stdin #stdout 0s 15232KB
comments (?)
stdin 
Standard input is empty
stdout 
a1: 1
a2: 4
b: 2
b: 5
c: 3
c: 6
d: 11
d: 0
https://ideone.com/CVZ2Me
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
secret

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