C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  vector<bool>          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Alexandros Guest Posted: Fri Dec 26, 2003 12:52 pm    Post subject: vector<bool> Can anyone tell me how to convert several bits stored in a vectro<bool> to bytes (char)? for example: vector<bool> v; v.reserve(; v.push_back(0); v.push_back(0); v.push_back(0); v.push_back(0); v.push_back(1); v.push_back(0); v.push_back(0); v.push_back(0); and now I want to get char* c = static_cast<char*>(v.begin()); so that c[0] == 8; that above doesn't work. How can I do it? Is there any funcion "toByte()" or sth like that? thanks. Back to top lallous Guest Posted: Fri Dec 26, 2003 1:24 pm    Post subject: Re: vector<bool> Hello, "Alexandros" <email (AT) company (DOT) com> wrote Quote: Can anyone tell me how to convert several bits stored in a vectro<bool to bytes (char)? for example: vector v.reserve(; v.push_back(0); v.push_back(0); v.push_back(0); v.push_back(0); v.push_back(1); v.push_back(0); v.push_back(0); v.push_back(0); and now I want to get char* c = static_cast<char*>(v.begin()); so that c[0] == 8; that above doesn't work. How can I do it? Is there any funcion "toByte()" or sth like that? thanks. The code should be similar to this: char c = 0; for (int i=0;i { c = (c << i) | (v[i] == true ? 1 : 0); } -- Elias Back to top Ron Natalie Guest Posted: Fri Dec 26, 2003 3:44 pm    Post subject: Re: vector<bool> "lallous" <lallous (AT) lgwm (DOT) org> wrote Quote: c = (c << i) | (v[i] == true ? 1 : 0); c = (c << 1) | v[i]; Back to top lallous Guest Posted: Fri Dec 26, 2003 3:45 pm    Post subject: Re: vector<bool> "Ron Natalie" <ron (AT) sensor (DOT) com> wrote Quote: "lallous" <lallous (AT) lgwm (DOT) org> wrote c = (c << i) | (v[i] == true ? 1 : 0); c = (c << 1) | v[i]; Yes.... -- Elias Back to top Cy Edmunds Guest Posted: Fri Dec 26, 2003 6:40 pm    Post subject: Re: vector<bool> "Alexandros" <email (AT) company (DOT) com> wrote Quote: Can anyone tell me how to convert several bits stored in a vectro<bool to bytes (char)? for example: vector v.reserve(; v.push_back(0); v.push_back(0); v.push_back(0); v.push_back(0); v.push_back(1); v.push_back(0); v.push_back(0); v.push_back(0); and now I want to get char* c = static_cast<char*>(v.begin()); so that c[0] == 8; that above doesn't work. How can I do it? Is there any funcion "toByte()" or sth like that? thanks. std::vector<bool> blivvet; blivvet.push_back(true); blivvet.push_back(false); blivvet.push_back(false); blivvet.push_back(true); std::vector<char> snarfle(blivvet.begin(), blivvet.end()); for (unsigned int j = 0; j < snarfle.size(); ++j) std::cout << int(snarfle[j]); std::cout << 'n'; output is: 1001 -- Cy http://home.rochester.rr.com/cyhome/ Back to top Alexandros Guest Posted: Sun Dec 28, 2003 2:33 pm    Post subject: Re: vector<bool> Quote: output is: 1001 But according to what I want to do output should be 9. I mean: if i have this vector<bool> v: (0,0,0,0,1,0,0,1) I want to get a vector<char> or a char* vc: (9) another example: if v is (0,0,0,0,1,0,0,1, 0,0,0,0,0,0,1,1) then vc should be (9,3) do I make sense? Back to top Victor Bazarov Guest Posted: Sun Dec 28, 2003 3:33 pm    Post subject: Re: vector<bool> "Alexandros" <email (AT) company (DOT) com> wrote... Quote: output is: 1001 But according to what I want to do output should be 9. I mean: if i have this vector<bool> v: (0,0,0,0,1,0,0,1) I want to get a vector<char> or a char* vc: (9) another example: if v is (0,0,0,0,1,0,0,1, 0,0,0,0,0,0,1,1) then vc should be (9,3) do I make sense? Probably. There is no pret-a-porte way for you to use. You have to program it yourself. Victor Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.