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  1. #include "stdio.h"
  2.  
  3. namespace A {
  4.     template <typename T>
  5.     struct Key {
  6.       T value;
  7.     };
  8.  
  9.     template <typename T>
  10.     bool operator==(const Key<T> &a, const Key<T> &b) {
  11.       return a.value == b.value;
  12.     }
  13. }
  14. namespace B {
  15.     template <typename KT, typename VT>
  16.     struct MappedVal {
  17.       VT value;
  18.       A::Key<KT> key;
  19.     };
  20.  
  21.     template <typename KT, typename VT>
  22.     bool operator==(const MappedVal<KT, VT> &a, const MappedVal<KT, VT> &b) {
  23.       return (a.key == b.key && a.value == b.value);
  24.     }
  25. }
  26.  
  27. int main() {
  28.   A::Key<short> key1, key2;
  29.   key1.value = 1;
  30.   key2.value = 1;
  31.  
  32.   B::MappedVal<short, double> val1, val2;
  33.   val1.key = key1;
  34.   val1.value = 12.41;
  35.  
  36.   val2.key = key1;
  37.   val2.value = 12.41;
  38.  
  39.   bool test1 = (key1 == key2);
  40.   bool test2 = (val1 == val2);
  41.  
  42.   printf("key1 == key2: %s", (test1 ? "true" : "false"));
  43.   printf("val1 == val2: %s", (test2 ? "true" : "false"));
  44.  
  45.   return 0;
  46. }
Success #stdin #stdout 0s 3296KB
comments (?)
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Standard input is empty
stdout
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key1 == key2: trueval1 == val2: true
https://ideone.com/C7IGHM
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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