/in/foo.cc:9:11: error: 'int index' redeclared as different kind of symbol
 int next, index, pipe, time;
           ^~~~~
In file included from /usr/include/c++/6/cstring:42:0,
                 from /in/foo.cc:2:
/usr/include/string.h:477:1: note: previous declaration 'const char* index(const char*, int)'
 index (const char *__s, int __c) __THROW
 ^~~~~