fork download
copy 
  1. #include <iostream>
  2. #include<new>
  3. #include<vector>
  4.  
  5. class Singleton
  6. {
  7.     private:
  8.         Singleton() = default; 
  9.         ~Singleton() = default; 
  10.  
  11.     public: 
  12.  
  13.         Singleton(const Singleton&) = delete;  
  14.         Singleton& operator=(const Singleton&) = delete;
  15.  
  16.         void* operator new(std::size_t) = delete;
  17.         void* operator new[](std::size_t) = delete;
  18.  
  19.         void operator delete(void*) = delete;
  20.         void operator delete[](void*) = delete;
  21.  
  22.         static const Singleton& getInstance()
  23.         {
  24.             static Singleton mySingleton;
  25.  
  26.             return mySingleton; 
  27.         }
  28.  
  29.         void foo() const
  30.         {
  31.         	std::cout << this;
  32.         }
  33. };
  34.  
  35.  
  36. int main(int argc, const char *argv[])
  37. {
  38.     const Singleton& s1 = Singleton::getInstance(); 
  39.  
  40.     // Why does this compile?
  41.     std::vector<Singleton> v(2);
  42.  
  43.     v.front().foo();
  44.  
  45.     return 0;
  46. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0x8750008
https://ideone.com/QEe5SN
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!