How Can I Achieve Python's `zip` Functionality with Multiple Ranges in C 11?-C++-php.cn

How Can I Achieve Python's `zip` Functionality with Multiple Ranges in C 11?

Barbara Streisand

Release： 2024-12-13 17:18:11

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How Can I Achieve Python's `zip` Functionality with Multiple Ranges in C 11?

Sequence-zip Function for C 11?

The range-based for-loop in C 11 offers significant improvements in code readability and succinctness. It allows you to iterate over a range of elements using a simplified syntax, as seen in:

for (auto x : Y) {}

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However, this syntax does not directly extend to looping over multiple concurrent ranges, like Python's zip function.

Boost Solution

Prior to C 11, the Boost library provided two methods to emulate Python's zip functionality:

Boost.Range.Combine:

#include <boost/range/combine.hpp>

std::vector<int> a {4, 5, 6};
double b[] = {7, 8, 9};
std::list<std::string> c {"a", "b", "c"};

for (auto tup : boost::combine(a, b, c, a)) {
    int x, w;
    double y;
    std::string z;
    boost::tie(x, y, z, w) = tup;
    printf("%d %g %s %d\n", x, y, z.c_str(), w);
}

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Boost.Iterator.ZipIterator:

#include <boost/iterator/zip_iterator.hpp>
#include <boost/range.hpp>

template <typename... T>
auto zip(T&&... containers) -> boost::iterator_range<boost::zip_iterator<decltype(boost::make_tuple(std::begin(containers)...))>>
{
    auto zip_begin = boost::make_zip_iterator(boost::make_tuple(std::begin(containers)...));
    auto zip_end = boost::make_zip_iterator(boost::make_tuple(std::end(containers)...));
    return boost::make_iterator_range(zip_begin, zip_end);
}

std::vector<int> a {4, 5, 6};
double b[] = {7, 8, 9};
std::list<std::string> c {"a", "b", "c"};

for (auto tup : zip(a, b, c, a)) {
    int x, w;
    double y;
    std::string z;
    std::tie(x, y, z, w) = tup;
    printf("%d %g %s %d\n", x, y, z.c_str(), w);
}

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