Re: [Boost-users] Comparing two vectors element by element

10 Sep 2008

      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 
wrote:
...
On Tue, Sep 9, 2008 at 4:55 PM, Sean Farrow
 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;
}
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