generatorChunking.cpp

// This example shows off generators' ability to un-chunk chunked data.
 
#include <iostream>
#include <z/all.hpp>
 
using z::core::generatorFrom;
using z::core::join;
using z::core::range;
 
int main() {
    std::cout << "Chunking a generator:" << std::endl;
    for (auto chunk : range(10).chunk(5)) {
        std::cout << '[' << join(chunk, ",") << ']' << std::endl;
    }
 
    std::cout << "Unchunking from a chunked generator:" << std::endl;
    auto gen = range(10).chunk(5);
    for (auto item : gen.flatten()) {
        std::cout << item << ", ";
    }
    std::cout << std::endl;
 
    // Technically, the generator doesn't need to have been chunked
    // in order to be flattened; it just needs to yield objects with an iterator.
    // In this example, the yield from notChunked would be pairs of numbers,
    // but we can call `flatten()` to just yield individual numbers from the list.
    std::vector<std::vector<int>> listOfLists{{0, 1}, {2, 3}, {4, 5}, {6, 7}, {8, 9}};
    auto notChunked = generatorFrom(listOfLists);
 
    std::cout << "Unchunking from an arbitrary iterator:" << std::endl;
    for (auto item : notChunked.flatten()) {
        std::cout << item << ", ";
    }
    std::cout << std::endl;
}