CODEWITHSUNDEEP
c++for-loop
flakes
flakes

Reputation: 23674

Achieve range-based for in older c++

I'm used to other languages that support foreach loops or the range-based for in c++11. I'm trying to emulate it in c++98.. Mainly because I don't like using the (*it) notation every time I need the object.

Say I have this c++11 code:

std::vector<int> myVec{...};
for(auto& outerLoopVar : myVec)
{
    for(auto& innerLoopVar : myVec)
    {
        // do logic
    }
}

Is there a better way to replicate that in c++98 than doing something like this?

std::vector<int> myVec;
// populate vector
for(std::vector<int>::iterator it1 = myVec.begin(); it1 < myVec.end(); it1++)
{
    int& outerLoopVar = *it1;
    for(std::vector<int>::iterator it2 = myVec.begin(); it2 < myVec.end(); it2++)
    {
        int& innerLoopVar = *it2;
        // do logic
    }
}

Upvotes: 1

Views: 84

Answers (2)

Paul Evans
Paul Evans

Reputation: 27577

You want to use boost foreach:

#include <boost/foreach.hpp>

BOOST_FOREACH(int& elem, myVec) {
    // do logic
}

Upvotes: 2

Mo Beigi
Mo Beigi

Reputation: 1765

Not really, I mean the iterator notation is quite standard and is applicable to multiple containers and objects. Its a valuable tool which should be used. I don't really know why you don't like using the notation but I think its better if you embrace it.

Upvotes: 1

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