Sequential sequence containers OR How to pack vectors

Question

Imagine I have two vectors:

std::vector<int> A,B;
//Push a bunch of data into A
//Push a bunch of data into B

For whatever reason, I want to create an interface to these vectors such as follows:

packed combined(A,B);
for(packed::iterator i=combined.begin();i!=combined.end();++i)
  *i+=1;

This will have the same effect as:

for(std::vector::iterator i=A.begin();i!=A.end();++i)
  *i+=1;
for(std::vector::iterator i=B.begin();i!=B.end();++i)
  *i+=1;

I could code up a class to do this, but it seems like the code may already exist in a library somewhere. Does anyone know if this is the case?

Alternatively, can you think of a cunning way to do this?

I tried, @rhalbersma, but he slipped away and escaped before I could ask him. — Richard, Apr 25 '13 at 22:28

score 5 · Accepted Answer · answered Apr 25 '13 at 22:28

5

boost::join:

#include <vector>
#include <boost/range/join.hpp>

int main()
{
    std::vector<int> a = {1,2,3}, b = {4,5,6};
    for(int& i : boost::join(a, b)) {
        i += 1;
    }
}

answered Apr 25 '13 at 22:28

Jesse Good

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+1 for some reason I didn't think of boost.join but the more fragile zip iterators – TemplateRex Apr 25 '13 at 22:36

Sequential sequence containers OR How to pack vectors

1 Answers1