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  1. #include <iostream>
  2. #include <typeinfo>
  3. #include <memory>
  4. #include <cxxabi.h>
  5. #include <string>
  6.  
  7. template <typename T> std::string TypeName(T) {
  8.  
  9.     auto name = typeid(T).name();
  10.     int status = 0;
  11.  
  12.     std::unique_ptr<char, void(*)(void*)> res {
  13.         abi::__cxa_demangle(name, NULL, NULL, &status),
  14.         std::free
  15.     };
  16.  
  17.     return ((status == 0) ? res.get() : name);
  18. }
  19.  
  20.  
  21. int main()
  22. {
  23. 	int i = 0;
  24. 	float f = 0.f;
  25.  
  26. 	std::cout << TypeName(i) << '\n'; // int
  27. 	std::cout << TypeName(f) << '\n'; // float, so far so good
  28.  
  29. 	std::cout << TypeName(&i) << '\n'; // int *
  30. 	std::cout << TypeName(&f) << '\n'; // float *, as expected
  31.  
  32. 	const int ci = 1;
  33. 	const float cf = 1.f;
  34.  
  35. 	std::cout << TypeName(ci) << '\n'; // int!
  36. 	std::cout << TypeName(cf) << '\n'; // float!
  37.  
  38. 	int &ri = i;
  39. 	float &rf = f;
  40.  
  41. 	std::cout << TypeName(ri) << '\n'; // int!
  42. 	std::cout << TypeName(rf) << '\n'; // float!
  43.  
  44. 	const int &cri = i;
  45. 	const float &crf = f;
  46.  
  47. 	std::cout << TypeName(cri) << '\n'; // int!
  48. 	std::cout << TypeName(crf) << '\n'; // float!
  49.  
  50. 	return 0;
  51. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin 
Standard input is empty
stdout 
int
float
int*
float*
int
float
int
float
int
float
https://ideone.com/ieboQs
Pregunta sobre deducción de tipos
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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