libdpf/examples/evaluation/eval_interval.cpp

#include <cstdint>
#include <iostream>

#include "dpf.hpp"

/// Inclusive range. The returned iterable yields one share per input in
/// `[from, to]`, in that order.
int main()
{
    const std::uint8_t alpha = 42;
    const std::uint64_t beta = 7;
    const std::uint8_t from = 40;
    const std::uint8_t to = 50;
    auto [k0, k1] = dpf::make_dpf(alpha, beta);

    //! [eval-interval]
    auto [buf0, iter0] = dpf::eval_interval(k0, from, to);
    auto [buf1, iter1] = dpf::eval_interval(k1, from, to);

    auto it0 = std::begin(iter0);
    auto it1 = std::begin(iter1);
    for (std::uint8_t x = from; x <= to; ++x, ++it0, ++it1)
    {
        std::uint64_t got = dpf::reconstruct(*it0, *it1);
        std::uint64_t expect = (x == alpha) ? beta : 0;
        if (got != expect)
        {
            std::cerr << "eval_interval\n";
            return 1;
        }
    }
    //! [eval-interval]
    if (it0 != std::end(iter0) || it1 != std::end(iter1))
    {
        std::cerr << "eval_interval length\n";
        return 1;
    }

    std::cout << dpf::reconstruct(*std::begin(iter0), *std::begin(iter1)) << "\n";
    (void)buf0;
    (void)buf1;
    return 0;
}