test.cpp

#include <iostream>

int main()
{
   const bool true_val();
   const bool val;

   bool *const ptr();
   bool *const other_ptr;
   
   std::cout << "Default initialization: " << true_val << '\n'
             << "Uninitialized" << val << '\n'
             << "Default initialization (pointer): " << ptr << '\n'
             << "Uninitialized (pointer): " << other_ptr << '\n';
}