Re: [Boost-users] Comparing two vectors element by element
On Tue, Sep 9, 2008 at 5:15 PM, Peter Barker <newbarker@gmail.com> wrote:
On Tue, Sep 9, 2008 at 4:55 PM, Sean Farrow <sean.farrow@seanfarrow.co.uk> wrote:
Hi: I need to compare two vectors. I already have a function to compare two individual elements (std::bitsets) in this case. Can I use boost.foreach to do this, or is there a better way. I need to know whether vector one, is less than vector two.
Any help apreciated. Cheers Sean.
Just use == as you do with built in data types e.g.:
#include <vector> #include <iostream>
int main() { std::vector<int> v1; std::vector<int> v2;
if(v1 == v2) std::cout << "They're the same" << std::endl; }
Oops - sorry - I posted too quickly. Let's try again... Just use the < operator as you would with built in types. e.g.: #include <vector> #include <iostream> int main() { std::vector<int> v1; v1.push_back(5); std::vector<int> v2; v2.push_back(6); if(v1 < v2) std::cout << "v1 is smaller than v2" << std::endl; }
Hi: The code doesn't compile here as std:bitset<bits> doesn't define the < operator according to visual studio. I have a custom operator defined as a structure: struct BitSetComp { bool operator()(const std::bitset<6>& lhs, const std::bitset<6>& rhs) const { return lhs.to_ulong() < rhs.to_ulong(); } }; How can I use this in the code you providee, or do I need to redefine in a certain way? Cheers Sean. -----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peter Barker Sent: 09 September 2008 17:17 To: boost-users@lists.boost.org Subject: Re: [Boost-users] Comparing two vectors element by element On Tue, Sep 9, 2008 at 5:15 PM, Peter Barker <newbarker@gmail.com> wrote:
On Tue, Sep 9, 2008 at 4:55 PM, Sean Farrow <sean.farrow@seanfarrow.co.uk> wrote:
Hi: I need to compare two vectors. I already have a function to compare two individual elements (std::bitsets) in this case. Can I use boost.foreach to do this, or is there a better way. I need to know whether vector one, is less than vector two.
Any help apreciated. Cheers Sean.
Just use == as you do with built in data types e.g.:
#include <vector> #include <iostream>
int main() { std::vector<int> v1; std::vector<int> v2;
if(v1 == v2) std::cout << "They're the same" << std::endl; }
Oops - sorry - I posted too quickly. Let's try again... Just use the < operator as you would with built in types. e.g.: #include <vector> #include <iostream> int main() { std::vector<int> v1; v1.push_back(5); std::vector<int> v2; v2.push_back(6); if(v1 < v2) std::cout << "v1 is smaller than v2" << std::endl; } _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users __________ Information from ESET NOD32 Antivirus, version of virus signature database 3430 (20080910) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3430 (20080910) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
participants (3)
-
Peter Barker -
Sean Farrow