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Asked: 2026-05-26T15:07:32+00:00

Consider this code: #include <iostream> template<class C> struct time { }; int main() {

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Consider this code:

#include <iostream>

template<class C>
struct time { };

int main() { }

It produces (GCC 4.5):

error: ‘template<class C> struct time’ redeclared as different kind of symbol
/usr/include/time.h:186:15: error: previous declaration of ‘time_t time(time_t*)’
  1. Why does iostream include time_t time(time_t*) ?
  2. Why does iostream include time_t time(time_t*) outside std namespace?
  3. (unanswered) Why, if I remove template<class C>, do I not get this error?
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1 Answer

  1. Editorial Team

    If you run g++ -H -Wall -c testim.cc (where testim.cc is your example) you’ll see that 

    .... /usr/include/c++/4.6/bits/ios_base.h
..... /usr/include/c++/4.6/ext/atomicity.h
...... /usr/include/c++/4.6/x86_64-linux-gnu/./bits/gthr.h
....... /usr/include/c++/4.6/x86_64-linux-gnu/./bits/gthr-default.h
........ /usr/include/pthread.h
......... /usr/include/sched.h
.......... /usr/lib/gcc/x86_64-linux-gnu/4.6/include/stddef.h
.......... /usr/include/time.h

    So <time.h> is included for pthread support.

    This is with GCC 4.6 on Debian/Sid/AMD64

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