Created
March 19, 2015 20:56
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enumerate emulation in C++ with boost
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#include <boost/iterator/zip_iterator.hpp> | |
#include <boost/range.hpp> | |
#include <iostream> | |
#include <boost/range/counting_range.hpp> | |
#include <list> | |
template <typename... T> | |
auto zip(const 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); | |
} | |
template <typename T> auto enumerate(const T &container) { | |
return zip(boost::counting_range(0, static_cast<int>(container.size())), | |
container); | |
} | |
int main() { | |
std::list<std::string> a{"a", "b", "c"}; | |
for (auto tup : enumerate(a)) { | |
int i; | |
std::string el; | |
boost::tie(i, el) = tup; | |
std::cout << i << " " << el << std::endl; | |
} | |
} |
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