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

Subject: Re: [Boost-users] Comparing two vectors element by element
From: Sean Farrow (sean.farrow_at_[hidden])
Date: 2008-09-10 02:20:06

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_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Peter Barker
Sent: 09 September 2008 17:17
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] Comparing two vectors element by element

On Tue, Sep 9, 2008 at 5:15 PM, Peter Barker <newbarker_at_[hidden]>
wrote:
> On Tue, Sep 9, 2008 at 4:55 PM, Sean Farrow
> <sean.farrow_at_[hidden]> 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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