From 6a8f10f47147358569ea6083393a211298735efc Mon Sep 17 00:00:00 2001
From: Alex Shabalin <alex.shabalin@pm.me>
Date: Mon, 26 Aug 2024 15:34:59 +0200
Subject: [PATCH] Add option to pass parameters to cereal archive

---
 immer/extra/persist/cereal/with_pools.hpp | 27 +++++++++++++++--------
 test/extra/persist/test_special_pool.cpp  |  5 ++++-
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/immer/extra/persist/cereal/with_pools.hpp b/immer/extra/persist/cereal/with_pools.hpp
index 694dc24a..2828ddb8 100644
--- a/immer/extra/persist/cereal/with_pools.hpp
+++ b/immer/extra/persist/cereal/with_pools.hpp
@@ -21,10 +21,12 @@ namespace immer::persist {
  */
 template <class Archive = cereal::JSONOutputArchive,
           class T,
-          Policy<T> Policy = default_policy>
+          Policy<T> Policy = default_policy,
+          class... Args>
 void cereal_save_with_pools(std::ostream& os,
                             const T& value0,
-                            const Policy& policy = Policy{})
+                            const Policy& policy = Policy{},
+                            Args&&... args)
 {
     const auto types = boost::hana::to_set(policy.get_pool_types(value0));
     auto pools       = detail::generate_output_pools(types);
@@ -37,7 +39,8 @@ void cereal_save_with_pools(std::ostream& os,
         Archive,
         Pools,
         decltype(wrap),
-        decltype(get_pool_name_fn)>{pools, wrap, os};
+        decltype(get_pool_name_fn)>{
+        pools, wrap, os, std::forward<Args>(args)...};
     policy.save(ar, value0);
     // Calling finalize explicitly, as it might throw on saving the pools,
     // for example if pool names are not unique.
@@ -54,12 +57,15 @@ void cereal_save_with_pools(std::ostream& os,
  */
 template <class Archive = cereal::JSONOutputArchive,
           class T,
-          Policy<T> Policy = default_policy>
+          Policy<T> Policy = default_policy,
+          class... Args>
 std::string cereal_save_with_pools(const T& value0,
-                                   const Policy& policy = Policy{})
+                                   const Policy& policy = Policy{},
+                                   Args&&... args)
 {
     auto os = std::ostringstream{};
-    cereal_save_with_pools<Archive>(os, value0, policy);
+    cereal_save_with_pools<Archive>(
+        os, value0, policy, std::forward<Args>(args)...);
     return os.str();
 }
 
@@ -72,8 +78,11 @@ std::string cereal_save_with_pools(const T& value0,
  */
 template <class T,
           class Archive    = cereal::JSONInputArchive,
-          Policy<T> Policy = default_policy>
-T cereal_load_with_pools(std::istream& is, const Policy& policy = Policy{})
+          Policy<T> Policy = default_policy,
+          class... Args>
+T cereal_load_with_pools(std::istream& is,
+                         const Policy& policy = Policy{},
+                         Args&&... args)
 {
     using TypesSet =
         decltype(boost::hana::to_set(policy.get_pool_types(std::declval<T>())));
@@ -92,7 +101,7 @@ T cereal_load_with_pools(std::istream& is, const Policy& policy = Policy{})
                                                                  Pools,
                                                                  decltype(wrap),
                                                                  PoolNameFn>{
-        std::move(pools), wrap, is};
+        std::move(pools), wrap, is, std::forward<Args>(args)...};
     auto value0 = T{};
     policy.load(ar, value0);
     return value0;
diff --git a/test/extra/persist/test_special_pool.cpp b/test/extra/persist/test_special_pool.cpp
index 8438fb7f..60364078 100644
--- a/test/extra/persist/test_special_pool.cpp
+++ b/test/extra/persist/test_special_pool.cpp
@@ -270,7 +270,10 @@ TEST_CASE("Special pool minimal test")
             },
     };
 
-    const auto json_str = immer::persist::cereal_save_with_pools(test1);
+    const auto json_str = immer::persist::cereal_save_with_pools(
+        test1,
+        immer::persist::default_policy{},
+        cereal::JSONOutputArchive::Options::NoIndent());
     // REQUIRE(json_str == "");
 
     {