clodboy

today in c++ value category fuckery:

what is the value category of an rvalue reference cast of a function?

2 people · Jun 17, 2025, 16:18
1+
Vaporeon :vaporeon:

@wallhackio Can you give me example of what rvalue reference cast of a function looks like? :psyduck:

1
clodboy
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@vaporeon_ I've actually never done it before so this'll take me a second haha

· · 1 · 0 · 1
clodboy

@vaporeon_ 

#include <iostream>

int add(int a, int b) { return a + b; }

int main() {
  // create type alias "AddType" for function of two ints that returns an int
  // (this is just C syntax I believe)
  typedef int (AddType) (int, int);

  AddType&& add_rvalue_ref = (AddType&&)add;

  std::cout << add_rvalue_ref(1, 2) << "\n";
}
1
clodboy

@vaporeon_ okay, for some reason std::cout << &add_rvalue_ref << "\n"; logs the number 1 to console and compilation gives me the warning "reference cannot be bound to dereferenced null pointer in well-defined C++ code; pointer may be assumed to always convert to true [-Wundefined-bool-conversion]" so um, what the fuck

1
Vaporeon :vaporeon:

@wallhackio Wundefined bool conversion

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