foo.cc: In function ‘int main()’:
foo.cc:21:26: warning: ‘((__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type*)((char*)&str + offsetof(std::__cxx11::string, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::<unnamed>)))[1]’ is used uninitialized [-Wuninitialized]
   21 |                 if(str[i]!=str[len-i+1])
foo.cc:16:16: note: ‘str’ declared here
   16 |         string str;
      |                ^~~

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