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  1. #include <string>
  2.  
  3. int lua_getnumber() { return 42; }
  4. std::string lua_getstring() { return "foo"; }
  5.  
  6. #include <type_traits>
  7.  
  8. template <typename T>
  9. using EnableIf = typename std::enable_if<T::value, int>::type;
  10. template <typename T>
  11. using DisableIf = typename std::enable_if<not T::value, int>::type;
  12.  
  13. namespace lua {
  14.     template <typename T,
  15.               EnableIf<std::is_arithmetic<T>>...>
  16.     T get() { return lua_getnumber(); }
  17.  
  18.     template <typename T,
  19.               DisableIf<std::is_arithmetic<T>>...>
  20.     T get() { return lua_getstring(); }
  21. }
  22.  
  23. #include <iostream>
  24.  
  25. int main() {
  26.     std::cout << lua::get<int>() << '\n';
  27.     std::cout << lua::get<double>() << '\n';
  28.     std::cout << lua::get<std::string>() << '\n';
  29. }
Success #stdin #stdout 0s 2984KB
comments (?)
stdin
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Standard input is empty
stdout
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42
42
foo
https://ideone.com/j95NPU
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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