fork download
copy 
  1. #include <type_traits>
  2. #include <typeinfo>
  3. #include <cxxabi.h>
  4. #include <memory>
  5. #include <string>
  6. #include <cstdlib>
  7. #include <iostream>
  8.  
  9. template <class T>
  10. std::string
  11. type_name()
  12. {
  13.     typedef typename std::remove_reference<T>::type TR;
  14.     std::unique_ptr<char, void(*)(void*)> own
  15.            (
  16.                 abi::__cxa_demangle(typeid(TR).name(), nullptr,
  17.                                            nullptr, nullptr),
  18.                 std::free
  19.            );
  20.     std::string r = own != nullptr ? own.get() : typeid(TR).name();
  21.     if (std::is_const<TR>::value)
  22.         r += " const";
  23.     if (std::is_volatile<TR>::value)
  24.         r += " volatile";
  25.     if (std::is_lvalue_reference<T>::value)
  26.         r += "&";
  27.     else if (std::is_rvalue_reference<T>::value)
  28.         r += "&&";
  29.     return r;
  30. }
  31.  
  32.  
  33.  
  34. int
  35. main()
  36. {
  37.     char* pointer[] = {"hallo"};
  38.     char **p = pointer; // SeppJ weiss alles
  39.     std::cout << "decltype(pointer) is " << type_name<decltype(pointer)>() << '\n';
  40.     std::cout << "decltype(p) is " << type_name<decltype(p)>() << '\n';
  41. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
decltype(pointer) is char* [1]
decltype(p) is char**
https://ideone.com/Nqvldf
language:
C++ (gcc 8.3)
created:
7 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!