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c++c++11typeid

C++11 - typeid uniqueness

In C++11, I am using this

typeid(T).name()

for my own hash computation. I don't need the result to be same between the program runs or compilations. I just need it to be unique for the types. I know, that it can return same name for different types, but it is usually with const, pointers etc. In my case, T is only class XY, struct XX or derived types.

In this case, can I assume, that T will be unique?

Solution

  • You should use std::type_index for mapping purposes.

    The type_index class is a wrapper class around a std::type_info object, that can be used as index in associative and unordered associative containers. The relationship with type_info object is maintained through a pointer, therefore type_index is CopyConstructible and CopyAssignable.