ForeachZip.h

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#ifndef _OPENCOG_FOREACH_ZIP_H
#define _OPENCOG_FOREACH_ZIP_H

#include <opencog/atomspace/Handle.h>

namespace opencog
{
template<class T>
inline bool foreach_atom_pair(const std::vector<Handle> &va,
                              const std::vector<Handle> &vb,
                              bool (T::*cb)(const Handle&, const Handle&), T *data)
{
    size_t vasz = va.size();
    size_t vbsz = vb.size();
    size_t minsz = std::min(vasz, vbsz);

    for (size_t i = 0; i < minsz; i++) {
        bool rc = (data->*cb)(va[i], vb[i]);
        if (not rc) return false;
    }

    for (size_t i = vasz; i < vbsz; i++) {
        bool rc = (data->*cb)(Handle::UNDEFINED, vb[i]);
        if (not rc) return false;
    }
    for (size_t i = vbsz; i < vasz; i++) {
        bool rc = (data->*cb)(va[i], Handle::UNDEFINED);
        if (not rc) return false;
    }
    return true;
}

} // namespace opencog

#endif // _OPENCOG_FOREACH_ZIP_H