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  1.     #include <iostream>
  2.  
  3.     struct Tester {
  4.         template <typename T, typename FT>
  5.         void operator()( const FT & (T::*ptr)() const ) const
  6.         {
  7.             std::cout << "const exists" << std::endl;
  8.         }
  9.  
  10.         template <typename T, typename FT>
  11.         void operator()( FT & (T::*ptr)() )
  12.         {
  13.             std::cout << "non-const exists" << std::endl;
  14.         }
  15.     };
  16.  
  17.  
  18.     struct A {
  19.         const double & a() const { return a_; }
  20.         double & a() { return a_; }
  21.  
  22.         private:
  23.             double a_;
  24.     };
  25.  
  26.     struct B {
  27.         const double & b() const { return b_; }
  28.  
  29.         private:
  30.             double b_;
  31.     };
  32.  
  33.  
  34.  
  35.     int main( int argc, char **argv )
  36.     {
  37.         Tester t;
  38.         t(&A::a);
  39.         t(&B::b);
  40.  
  41.         return 0;
  42.     }
Success #stdin #stdout 0.02s 2724KB
comments (?)
stdin 
Standard input is empty
stdout 
non-const exists
const exists
https://ideone.com/eKzWz
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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