Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

examples/evaluation/eval_interval.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+#include "dpf.hpp"
+
+int main(int arc, char * argv[])
+{
+    uint16_t x = 42, y;
+    using prg = dpf::prg::counter_wrapper<dpf::prg::dummy>; 
+
+    // Make the DPF
+    auto before = prg::count();
+    auto [dpf0, dpf1] = dpf::make_dpf<prg>(x);
+    auto after = prg::count();
+    std::cout << "dpf::make_dpf prg invocation: " << (after-before) << "\n";
+
+    // Evaluate the DPF by interval
+    before = prg::count();
+    int from = 0, to = 49;
+    auto [buf0, iter0] = dpf::eval_interval(dpf0, from, to); 
+    auto [buf1, iter1] = dpf::eval_interval(dpf1, from, to);
+    after = prg::count();
+    std::cout << "dpf::eval_interval prg invocation: " << (after-before) << "\n";
+
+    // Retrieve the original input by iterating over the two buffers
+    std::vector<bool> result;
+    for (size_t i = from; i < to+1; ++i) {
+        bool item1 = buf0[i];
+        bool item2 = buf1[i];
+        result.push_back(item1 ^ item2);
+        if (item1 ^ item2) y=i;
+    }
+    // Print out the XOR interval
+    for (const auto& item : result) {
+        std::cout << static_cast<bool>(item);
+    }
+    std::cout << std::endl;
+    if (y == x) std::cout << "The orginal value is: " << x << std::endl;
+    else std::cout << "The evaluated inputs did not match the original value." << std::endl; 
+
+    std::cout << "Total PRG invocation: " << prg::count() << std::endl;
+
+    return 0;
+}