1 files changed, 41 insertions, 0 deletions
diff --git a/src/libstore/common-protocol-impl.hh b/src/libstore/common-protocol-impl.hh
new file mode 100644
index 000000000..079c182b8
--- /dev/null
+++ b/src/libstore/common-protocol-impl.hh
@@ -0,0 +1,41 @@
+#pragma once
+/**
+ * @file
+ *
+ * Template implementations (as opposed to mere declarations).
+ *
+ * This file is an exmample of the "impl.hh" pattern. See the
+ * contributing guide.
+ */
+
+#include "common-protocol.hh"
+#include "length-prefixed-protocol-helper.hh"
+
+namespace nix {
+
+/* protocol-agnostic templates */
+
+#define COMMON_USE_LENGTH_PREFIX_SERIALISER(TEMPLATE, T) \
+    TEMPLATE T CommonProto::Serialise< T >::read(const Store & store, CommonProto::ReadConn conn) \
+    { \
+        return LengthPrefixedProtoHelper<CommonProto, T >::read(store, conn); \
+    } \
+    TEMPLATE void CommonProto::Serialise< T >::write(const Store & store, CommonProto::WriteConn conn, const T & t) \
+    { \
+        LengthPrefixedProtoHelper<CommonProto, T >::write(store, conn, t); \
+    }
+
+COMMON_USE_LENGTH_PREFIX_SERIALISER(template<typename T>, std::vector<T>)
+COMMON_USE_LENGTH_PREFIX_SERIALISER(template<typename T>, std::set<T>)
+COMMON_USE_LENGTH_PREFIX_SERIALISER(template<typename... Ts>, std::tuple<Ts...>)
+
+#define COMMA_ ,
+COMMON_USE_LENGTH_PREFIX_SERIALISER(
+    template<typename K COMMA_ typename V>,
+    std::map<K COMMA_ V>)
+#undef COMMA_
+
+
+/* protocol-specific templates */
+
+}