unit_tests: fix build with boost 1.69

tests/unit_tests/net.cpp

@@ -893,7 +893,8 @@ TEST(dandelionpp_map, empty)
 TEST(dandelionpp_map, zero_stems)
 {
     std::vector<boost::uuids::uuid> connections{6};
-    std::generate(connections.begin(), connections.end(), boost::uuids::random_generator{});
+    for (auto &c: connections)
+      c = boost::uuids::random_generator{}();
 
     net::dandelionpp::connection_map mapper{connections, 0};
     EXPECT_EQ(mapper.begin(), mapper.end());
@@ -917,7 +918,8 @@ TEST(dandelionpp_map, zero_stems)
 TEST(dandelionpp_map, dropped_connection)
 {
     std::vector<boost::uuids::uuid> connections{6};
-    std::generate(connections.begin(), connections.end(), boost::uuids::random_generator{});
+    for (auto &c: connections)
+      c = boost::uuids::random_generator{}();
     std::sort(connections.begin(), connections.end());
 
     // select 3 of 6 outgoing connections
@@ -953,7 +955,8 @@ TEST(dandelionpp_map, dropped_connection)
     }
     std::map<boost::uuids::uuid, boost::uuids::uuid> mapping;
     std::vector<boost::uuids::uuid> in_connections{9};
-    std::generate(in_connections.begin(), in_connections.end(), boost::uuids::random_generator{});
+    for (auto &c: in_connections)
+      c = boost::uuids::random_generator{}();
     {
         std::map<boost::uuids::uuid, std::size_t> used;
         std::multimap<boost::uuids::uuid, boost::uuids::uuid> inverse_mapping;