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  1. #include <iostream>
  2. #include <vector>
  3. #include <tr1/functional>
  4.  
  5. class foo {
  6.   private:
  7.     int val;
  8.     foo() {}
  9.     foo(int v) : val(v) {}
  10.   public:
  11.     static foo create(int v) { return foo(v); }
  12.     int value() const { return val; }
  13. };
  14.  
  15. class bar {
  16.   private:
  17.     int val;
  18.     bar(const bar&) {}
  19.   public:
  20.     bar() {}
  21.     bar(int v) : val(v) {}
  22.     int value() const { return val; }
  23.     void value(int v) { val = v; }
  24. };
  25.  
  26. class baz {
  27.   private:
  28.     int val;
  29.     baz() {}
  30.     baz(int v) : val(v) {}
  31.     baz(const baz&) {}
  32.   public:
  33.     int value() const { return val; }
  34.     static baz create(int v) { return baz(v); }
  35. };
  36.  
  37. int main()
  38. {
  39.   using namespace std;
  40.   {
  41.     vector<foo> v;
  42.     v.push_back(foo::create(1));
  43.     cout << v[0].value() << endl;
  44.   }
  45.  
  46.   {
  47.     vector<tr1::reference_wrapper<bar> > v;
  48.     bar x(2);
  49.     v.push_back(tr1::ref(x));
  50.     bar& y = v[0];
  51.     cout << v[0].get().value();
  52.     y.value(3);
  53.     cout << ' ' << v[0].get().value() << ' ' << x.value() << endl;
  54.   }
  55.  
  56.   {
  57.     vector<tr1::reference_wrapper<const baz> > v;
  58.     const baz& x = baz::create(4);
  59.     v.push_back(tr1::ref(x));
  60.     const baz& y = v[0];
  61.     cout << y.value() << ' ' << v[0].get().value() << endl;
  62.   }
  63.  
  64.   return 0;
  65. }
Success #stdin #stdout 0s 2860KB
comments (?)
stdin 
Standard input is empty
stdout 
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https://ideone.com/XaKQV
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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