Foreach in c++ by rooks

Foreach in c++

[raw] LD18October Challenge 2010 29. Oct 2010 · 03:58 UTC · 70 days after compo start by rooks · 1

I created simple helper that might help few of you who use c++ with STL. It adds foreach to the c++ that traverses over all of the STL container, so the code is more readable, like in this example:

#include <cstdio>

#include <vector>

#include "foreach.h"

int main()

    // make int vector and fill it

    vector<int> k;

    for (int i=0; i<10; ++i) k.push_back(i);

    // show what the upper loop filled

    foreach_ (it, k) printf("%i ",(*it));

    printf("\n");

    // show all the data, but get rid of 4

    // http://en.wikipedia.org/wiki/Tetraphobia :)

    foreachdel_ (it, k)

        if (*it == 4) it=k.erase(it);

        printf("%i ",(*it));

    printf("\n");

    return 0;

Will result in following:

0 1 2 3 4 5 6 7 8 9

0 1 2 3 5 6 7 8 9

More on my blog: http://pleasanthacking.com/2010/06/17/foreach-in-cpp/

I hope some of you will find it useful during compos

Tags: C++, goodies, libraries, libs, tools

Comments

29. Oct 2010 · 06:58 UTC

The typeof operator is quite a new C++ feature.

Would this work? :

for(k.iterator it=k.begin(); it!=k.end(); ++it)

30. Oct 2010 · 01:16 UTC

Not only would it work, but it’d be the appropriate C++/STL way of iterating over a collection. Though I’m sure rooks’ foreach_ method is nothing more than a macro that expands to exactly that…