I used sometimes the Boost.Iterator library - especially the filter iterators. I like them much, but I don't like the work to create the iterator objects.
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Example:
struct IsEven { inline bool operator()(int n) const { return n%2==0; } };
vector<int> v;
IsEven iseven; filter_iterator<IsEven, vector<int>::iterator> filter_iter_begin(iseven, v.begin(), v.end()); filter_iterator<IsEven, vector<int>::iterator> filter_iter_end(iseven, v.end(), v.end());
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[snip]
Usage:
vector<int> v; auto iters = make_filter_iterators( v.begin(), v.end(), [](int n){ return n%2==0; }); copy(iters.first, iters.second, ostream_iterator<int>(cout, " "));
Have you tried the Boost.Range library? With that you can do simply vector<int> v; copy(v | filtered(IsEven()), ostream_iterator<int>(cout, " ")); That works even in C++03. Of course, in C++11 you can do: vector<int> v; copy(v | filtered([](int n){ return n%2==0; }), ostream_iterator<int>(cout, " ")); Regards, Nate