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  1. #include <iostream>
  2. #include <memory>
  3. #include <type_traits>
  4.  
  5. template <typename T>
  6. struct SelectDeleter {
  7.   void operator()(T* t) {
  8.     std::cout << "generic deleter" << std::endl;
  9.     delete t;
  10.   }
  11. };
  12.  
  13. template <typename T>
  14. struct SelectDeleter<T[]> {
  15.   void operator()(T* t) {
  16.     std::cout << "array deleter" << std::endl;
  17.     delete[] t;
  18.   };
  19. };
  20.  
  21. template <typename T, typename Deleter = SelectDeleter<T>>
  22. struct foobar {
  23.  
  24.   template <typename K>
  25.   struct SelectPtr {
  26.     using Ptr = K*;
  27.   };
  28.  
  29.   template <typename K>
  30.   struct SelectPtr<K[]> {
  31.     using Ptr = K*;
  32.   };
  33.  
  34.   using Ptr = typename SelectPtr<T>::Ptr;
  35.  
  36.   foobar(Ptr p) : ptr(p) {
  37.   }
  38.  
  39.   ~foobar() {
  40.     Deleter()(ptr);
  41.   }
  42.  
  43.   Ptr ptr;
  44. };
  45.  
  46. int main() {
  47.   foobar<int> f1( new int(42) );
  48.   foobar<int[]> f2( new int[42] );
  49. }
  50.  
Success #stdin #stdout 0s 3456KB
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Standard input is empty
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array deleter
generic deleter
https://ideone.com/igVXxb
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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