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Groups > comp.lang.c++ > #10999

Help with post-increment and sequence points

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#include <iostream>
int main() {
  int i = 1;
  std::cout << i << i++ << i << "\n";
}

Compiling this code in g++ prints out 212 . Is this correct? If so, I don't understand why. 

Shouldn't this actually be equivalent to f(f(f(f(std::cout,i),i++),i),"\n") where f is operator<< ? In that case, each time a function is entered, there should be a sequence point which makes the side effects happen. So I'd expect the output to be 112 instead. 

% g++ --version
g++ (Debian 4.6.1-4) 4.6.1

Best regards,
Laird Breyer

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Help with post-increment and sequence points laird@lbreyer.com - 2011-10-20 00:23 -0700
  Re: Help with post-increment and sequence points Leigh Johnston <leigh@i42.co.uk> - 2011-10-20 12:57 +0100
  Re: Help with post-increment and sequence points softwareEngineer <ovNOSPAM@NOSPAMlibero.it> - 2011-10-20 14:16 +0200
  Re: Help with post-increment and sequence points Victor Bazarov <v.bazarov@comcast.invalid> - 2011-10-20 08:26 -0400
    Re: Help with post-increment and sequence points Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-10-20 06:06 -0700
      Re: Help with post-increment and sequence points Victor Bazarov <v.bazarov@comcast.invalid> - 2011-10-20 09:50 -0400
    Re: Help with post-increment and sequence points laird@lbreyer.com - 2011-10-20 14:16 -0700
  Re: Help with post-increment and sequence points Markus Wichmann <nullplan@gmx.net> - 2011-10-20 18:09 +0200

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