initial commit

third_party/eigen/doc/special_examples/random_cpp11.cpp

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+#include <Eigen/Core>
+#include <iostream>
+#include <random>
+
+int main() {
+  std::default_random_engine generator;
+  std::poisson_distribution<int> distribution(4.1);
+  auto poisson = [&]() { return distribution(generator); };
+
+  Eigen::RowVectorXi v = Eigen::RowVectorXi::NullaryExpr(10, poisson);
+  std::cout << v << "\n";
+}