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  1. #include <iostream>
  2.  
  3. template <typename T1, T1 value>
  4. class Class1
  5. {
  6. public:
  7.         template <typename T2>
  8.         class Class2
  9.         {
  10.         public:
  11.                 explicit Class2(
  12.                         T2 theValue
  13.                 ) : myValue(theValue)
  14.                 {
  15.                         return;
  16.                 }
  17.  
  18.                 template <typename T1Other, T1Other valueOther, typename T2Other>
  19.                 inline Class2(
  20.                         typename Class1<T1Other, valueOther>::template Class2<T2Other> const & other
  21.                 ) {
  22.                         myValue = other.myValue;
  23.                 }
  24.  
  25.                 template <typename T1Other, T1Other valueOther, typename T2Other>
  26.                 inline bool operator==(
  27.                         typename Class1<T1Other, valueOther>::template Class2<T2Other> const & other
  28.                 ) const {
  29.                         return (myValue == other.myValue);
  30.                 }
  31.  
  32.         private:
  33.                 T2 myValue;
  34.         };
  35.  
  36.         Class2<T1> const get() const
  37.         {
  38.                 return Class2<T1>(value);
  39.         }
  40. };
  41.  
  42. int main(int argc, char * argv[])
  43. {
  44.         Class1<int, 1> c1;
  45.         Class1<int, 2> c2;
  46.  
  47.         std::cout << (c1.get() == c2.get());
  48. }
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: In function ‘int main(int, char**)’:
prog.cpp:47: error: no match for ‘operator==’ in ‘c1.Class1<T1, value>::get [with T1 = int, T1 value = 1]() == c2.Class1<T1, value>::get [with T1 = int, T1 value = 2]()’
stdout
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Standard output is empty
https://ideone.com/UxVE7
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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