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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. #include <memory>
  5. #include <map>
  6. #include <unordered_map>
  7.  
  8. using namespace std;
  9.  
  10. struct ptrwrap
  11. {
  12.     unique_ptr<int> foo;
  13. };
  14.  
  15. template <typename T>
  16. struct holder
  17. {
  18.     holder() = default;
  19.  
  20.     holder(const holder& b)
  21.         : t(b.t)
  22.     {
  23.     }
  24.  
  25.     holder(holder&& b)
  26.         : t(std::move(b.t))
  27.     {
  28.     }
  29.  
  30.     holder& operator=(const holder& h)
  31.     {
  32.         t = h.t;
  33.         return *this;
  34.     }
  35.  
  36.     holder& operator=(holder&& h)
  37.     {
  38.         t = std::move(h.t);
  39.         return *this;
  40.     }
  41.  
  42.     T t;
  43. };
  44.  
  45. struct y_u_no_elision
  46. {
  47.     holder<ptrwrap> elem;
  48. };
  49.  
  50. typedef unordered_map<std::string, y_u_no_elision> mymap;
  51.  
  52. mymap foo();
  53.  
  54. int main()
  55. {
  56.     auto m = foo();
  57.     m = foo();
  58.     return 0;
  59. }
  60.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
/home/9vauFj/ccmbTRZb.o: In function `main':
prog.cpp:(.text.startup+0x1c): undefined reference to `foo()'
prog.cpp:(.text.startup+0x22): undefined reference to `foo()'
collect2: error: ld returned 1 exit status
stdout
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Standard output is empty
https://ideone.com/xx7Uni
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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