How to examine type of something in c++ ?

Question

In c++, are there any functions similar to...
* "typeof(~)" in JavaScript
* "type(~)" in Python
* "~.class" in Ruby ?

Answer 1

typeid(~).name();

The output, however, depends on the compiler.

Another trick you can use is to use a class template declaration without implementation and rely on an error message.

template<typename T>
class Z;

auto a = 0;
Z<decltype(a)> z;

error: aggregate 'Z<int> z' has incomplete type and cannot be defined

This error message is less cryptic than typeid(~).name() on gcc at least.

Answer 2

#include <typeinfo>
cout << typeid(variable).name() << endl;

Answer 3

Thanks for answers !
I will try it!