From 99091420ae553b27345e04279fd19fe24fb684c1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ion=20Gazta=C3=B1aga?= <igaztanaga@gmail.com>
Date: Wed, 24 Aug 2022 14:43:39 +0200
Subject: [PATCH] Add experimental forward declaration of hash containers

---
 include/boost/container/container_fwd.hpp | 29 +++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/include/boost/container/container_fwd.hpp b/include/boost/container/container_fwd.hpp
index 9e82fde..df0fc12 100644
--- a/include/boost/container/container_fwd.hpp
+++ b/include/boost/container/container_fwd.hpp
@@ -186,6 +186,35 @@ template <class Key
          ,class Allocator = void >
 class flat_multimap;
 
+//Experimental forward declarations, not implemented yet!
+template <class Key
+         ,class Hash //= hash<Key>,
+         ,class Pred = std::equal_to<Key>
+         ,class Compare  = std::less<Key>
+         ,class Allocator = void
+         ,class Options = void>
+class hash_set;
+
+template <class Key
+         ,class Compare  = std::less<Key>
+         ,class Allocator = void
+         ,class Options = void >
+class hash_multiset;
+
+template <class Key
+         ,class T
+         ,class Compare  = std::less<Key>
+         ,class Allocator = void
+         ,class Options = void >
+class hash_map;
+
+template <class Key
+         ,class T
+         ,class Compare  = std::less<Key>
+         ,class Allocator = void
+         ,class Options = void >
+class hash_multimap;
+
 #ifndef BOOST_NO_CXX11_TEMPLATE_ALIASES
 
 //! Alias templates for small_flat_[multi]{set|map} using small_vector as container