Initial implementation of template deduction guides

include/boost/unordered/detail/implementation.hpp

@@ -193,6 +193,18 @@
 #endif
 #endif
 
+// BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+#if !defined(BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES)
+#if BOOST_COMP_CLANG && __cplusplus >= 201703
+#define BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES 1
+#endif
+#endif
+
+#if !defined(BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES)
+#define BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES 0
+#endif
+
 namespace boost {
   namespace unordered {
     namespace iterator_detail {

include/boost/unordered/unordered_map.hpp

@@ -831,6 +831,81 @@ namespace boost {
 #endif
     }; // class template unordered_map
 
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    namespace detail {
+      template <typename T>
+      using iter_key_t =
+        typename std::iterator_traits<T>::value_type::first_type;
+      template <typename T>
+      using iter_val_t =
+        typename std::iterator_traits<T>::value_type::second_type;
+      template <typename T>
+      using iter_to_alloc_t =
+        typename std::pair<iter_key_t<T> const, iter_val_t<T> >;
+    }
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::iter_to_alloc_t<InputIterator> > >
+    unordered_map(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
+        Allocator>;
+
+    template <class Key, class T, class Hash = boost::hash<Key>,
+      class Pred = std::equal_to<Key>,
+      class Allocator = std::allocator<std::pair<const Key, T> > >
+    unordered_map(std::initializer_list<std::pair<const Key, T> >,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_map<Key, T, Hash, Pred, Allocator>;
+
+    template <class InputIterator, class Allocator>
+    unordered_map(InputIterator, InputIterator, std::size_t, Allocator)
+      ->unordered_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Allocator>
+    unordered_map(InputIterator, InputIterator, Allocator)
+      ->unordered_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator>
+    unordered_map(InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      ->unordered_map<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class Key, class T, typename Allocator>
+    unordered_map(
+      std::initializer_list<std::pair<const Key, T> >, std::size_t, Allocator)
+      ->unordered_map<Key, T, boost::hash<Key>, std::equal_to<Key>, Allocator>;
+
+    template <class Key, class T, typename Allocator>
+    unordered_map(std::initializer_list<std::pair<const Key, T> >, Allocator)
+      ->unordered_map<Key, T, boost::hash<Key>, std::equal_to<Key>, Allocator>;
+
+    template <class Key, class T, class Hash, class Allocator>
+    unordered_map(std::initializer_list<std::pair<const Key, T> >, std::size_t,
+      Hash, Allocator)
+      ->unordered_map<Key, T, Hash, std::equal_to<Key>, Allocator>;
+
+#endif
+
     template <class K, class T, class H, class P, class A>
     class unordered_multimap
     {
@@ -1363,6 +1438,73 @@ namespace boost {
 #endif
     }; // class template unordered_multimap
 
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Pred =
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+      class Allocator = std::allocator<
+        boost::unordered::detail::iter_to_alloc_t<InputIterator> > >
+    unordered_multimap(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_multimap<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash, Pred,
+        Allocator>;
+
+    template <class Key, class T, class Hash = boost::hash<Key>,
+      class Pred = std::equal_to<Key>,
+      class Allocator = std::allocator<std::pair<const Key, T> > >
+    unordered_multimap(std::initializer_list<std::pair<const Key, T> >,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_multimap<Key, T, Hash, Pred, Allocator>;
+
+    template <class InputIterator, class Allocator>
+    unordered_multimap(InputIterator, InputIterator, std::size_t, Allocator)
+      ->unordered_multimap<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Allocator>
+    unordered_multimap(InputIterator, InputIterator, Allocator)
+      ->unordered_multimap<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>,
+        boost::hash<boost::unordered::detail::iter_key_t<InputIterator> >,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator>
+    unordered_multimap(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      ->unordered_multimap<boost::unordered::detail::iter_key_t<InputIterator>,
+        boost::unordered::detail::iter_val_t<InputIterator>, Hash,
+        std::equal_to<boost::unordered::detail::iter_key_t<InputIterator> >,
+        Allocator>;
+
+    template <class Key, class T, typename Allocator>
+    unordered_multimap(
+      std::initializer_list<std::pair<const Key, T> >, std::size_t, Allocator)
+      ->unordered_multimap<Key, T, boost::hash<Key>, std::equal_to<Key>,
+        Allocator>;
+
+    template <class Key, class T, typename Allocator>
+    unordered_multimap(
+      std::initializer_list<std::pair<const Key, T> >, Allocator)
+      ->unordered_multimap<Key, T, boost::hash<Key>, std::equal_to<Key>,
+        Allocator>;
+
+    template <class Key, class T, class Hash, class Allocator>
+    unordered_multimap(std::initializer_list<std::pair<const Key, T> >,
+      std::size_t, Hash, Allocator)
+      ->unordered_multimap<Key, T, Hash, std::equal_to<Key>, Allocator>;
+
+#endif
+
     ////////////////////////////////////////////////////////////////////////////
 
     template <class K, class T, class H, class P, class A>

include/boost/unordered/unordered_set.hpp

@@ -545,6 +545,52 @@ namespace boost {
 #endif
     }; // class template unordered_set
 
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+      class Pred =
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+      class Allocator = std::allocator<
+        typename std::iterator_traits<InputIterator>::value_type> >
+    unordered_set(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_set<typename std::iterator_traits<InputIterator>::value_type,
+        Hash, Pred, Allocator>;
+
+    template <class T, class Hash = boost::hash<T>,
+      class Pred = std::equal_to<T>, class Allocator = std::allocator<T> >
+    unordered_set(std::initializer_list<T>,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_set<T, Hash, Pred, Allocator>;
+
+    template <class InputIterator, class Allocator>
+    unordered_set(InputIterator, InputIterator, std::size_t, Allocator)
+      ->unordered_set<typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator>
+    unordered_set(InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      ->unordered_set<typename std::iterator_traits<InputIterator>::value_type,
+        Hash,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class T, class Allocator>
+    unordered_set(std::initializer_list<T>, std::size_t, Allocator)
+      ->unordered_set<T, boost::hash<T>, std::equal_to<T>, Allocator>;
+
+    template <class T, class Hash, class Allocator>
+    unordered_set(std::initializer_list<T>, std::size_t, Hash, Allocator)
+      ->unordered_set<T, Hash, std::equal_to<T>, Allocator>;
+
+#endif
+
     template <class T, class H, class P, class A> class unordered_multiset
     {
 #if defined(BOOST_UNORDERED_USE_MOVE)
@@ -1049,6 +1095,55 @@ namespace boost {
 #endif
     }; // class template unordered_multiset
 
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+
+    template <class InputIterator,
+      class Hash =
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+      class Pred =
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+      class Allocator = std::allocator<
+        typename std::iterator_traits<InputIterator>::value_type> >
+    unordered_multiset(InputIterator, InputIterator,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_multiset<
+        typename std::iterator_traits<InputIterator>::value_type, Hash, Pred,
+        Allocator>;
+
+    template <class T, class Hash = boost::hash<T>,
+      class Pred = std::equal_to<T>, class Allocator = std::allocator<T> >
+    unordered_multiset(std::initializer_list<T>,
+      std::size_t = boost::unordered::detail::default_bucket_count,
+      Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      ->unordered_multiset<T, Hash, Pred, Allocator>;
+
+    template <class InputIterator, class Allocator>
+    unordered_multiset(InputIterator, InputIterator, std::size_t, Allocator)
+      ->unordered_multiset<
+        typename std::iterator_traits<InputIterator>::value_type,
+        boost::hash<typename std::iterator_traits<InputIterator>::value_type>,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class InputIterator, class Hash, class Allocator>
+    unordered_multiset(
+      InputIterator, InputIterator, std::size_t, Hash, Allocator)
+      ->unordered_multiset<
+        typename std::iterator_traits<InputIterator>::value_type, Hash,
+        std::equal_to<typename std::iterator_traits<InputIterator>::value_type>,
+        Allocator>;
+
+    template <class T, class Allocator>
+    unordered_multiset(std::initializer_list<T>, std::size_t, Allocator)
+      ->unordered_multiset<T, boost::hash<T>, std::equal_to<T>, Allocator>;
+
+    template <class T, class Hash, class Allocator>
+    unordered_multiset(std::initializer_list<T>, std::size_t, Hash, Allocator)
+      ->unordered_multiset<T, Hash, std::equal_to<T>, Allocator>;
+
+#endif
+
     ////////////////////////////////////////////////////////////////////////////
     template <class T, class H, class P, class A>
     unordered_set<T, H, P, A>::unordered_set()

test/Jamfile.v2

@@ -63,6 +63,7 @@ test-suite unordered
         [ run unordered/equality_tests.cpp ]
         [ run unordered/swap_tests.cpp ]
         [ run unordered/detail_tests.cpp ]
+        [ run unordered/deduction_tests.cpp ]
 
         [ run unordered/compile_set.cpp : :
             : <define>BOOST_UNORDERED_USE_MOVE

test/unordered/deduction_tests.cpp

@@ -0,0 +1,347 @@
+#include <boost/unordered_map.hpp>
+#include <iostream>
+#include <vector>
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+struct hash_equals
+{
+  template <typename T> bool operator()(T const& x) const
+  {
+    boost::hash<T> hf;
+    return hf(x);
+  }
+
+  template <typename T> bool operator()(T const& x, T const& y) const
+  {
+    std::equal_to<T> eq;
+    return eq(x, y);
+  }
+};
+
+template <typename T> struct test_allocator
+{
+  typedef T value_type;
+  test_allocator() = default;
+  template <typename T2> test_allocator(test_allocator<T2> const&) {}
+  T* allocate(std::size_t n) const { return (T*)malloc(sizeof(T) * n); }
+  void deallocate(T* ptr, std::size_t) const { free(ptr); }
+  bool operator==(test_allocator const&) { return true; }
+  bool operator!=(test_allocator const&) { return false; }
+};
+#endif
+
+int main()
+{
+  std::cout << "BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES: "
+            << BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES << std::endl;
+
+#if BOOST_UNORDERED_TEMPLATE_DEDUCTION_GUIDES
+  std::vector<std::pair<int, int> > x;
+  x.push_back(std::make_pair(1, 3));
+  x.push_back(std::make_pair(5, 10));
+  test_allocator<std::pair<const int, int> > pair_allocator;
+  hash_equals f;
+
+  // unordered_map
+
+  /*
+   template<class InputIterator,
+           class Hash = hash<iter_key_t<InputIterator>>,
+           class Pred = equal_to<iter_key_t<InputIterator>>,
+           class Allocator = allocator<iter_to_alloc_t<InputIterator>>>
+    unordered_map(InputIterator, InputIterator, typename see below::size_type =
+   see below,
+                  Hash = Hash(), Pred = Pred(), Allocator = Allocator())
+      -> unordered_map<iter_key_t<InputIterator>, iter_val_t<InputIterator>,
+   Hash, Pred,
+                       Allocator>;
+  */
+
+  {
+    boost::unordered_map m(x.begin(), x.end());
+    static_assert(
+      std::is_same<decltype(m), boost::unordered_map<int, int> >::value);
+  }
+
+  /* Ambiguous:
+  {
+    boost::unordered_map m(x.begin(), x.end(), 0, std::hash<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_map<int, int,
+  std::hash<int>>>::value);
+  }
+
+  {
+    boost::unordered_map m(x.begin(), x.end(), 0, std::hash<int>(),
+  std::equal_to<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_map<int, int,
+  std::hash<int>, std::equal_to<int>>>::value);
+  }
+  */
+
+  {
+    boost::unordered_map m(x.begin(), x.end(), 0, std::hash<int>(),
+      std::equal_to<int>(), pair_allocator);
+    static_assert(std::is_same<decltype(m),
+      boost::unordered_map<int, int, std::hash<int>, std::equal_to<int>,
+        test_allocator<std::pair<const int, int> > > >::value);
+  }
+
+  /*
+  template<class Key, class T, class Hash = hash<Key>,
+           class Pred = equal_to<Key>, class Allocator = allocator<pair<const
+  Key, T>>>
+    unordered_map(initializer_list<pair<const Key, T>>,
+                  typename see below::size_type = see below, Hash = Hash(),
+                  Pred = Pred(), Allocator = Allocator())
+      -> unordered_map<Key, T, Hash, Pred, Allocator>;
+  */
+
+  {
+    boost::unordered_map m({std::pair<int const, int>(1, 2)});
+    static_assert(
+      std::is_same<decltype(m), boost::unordered_map<int, int> >::value);
+  }
+
+  /* Ambiguous
+  {
+    boost::unordered_map m({std::pair<int const, int>(1,2)}, 0,
+  std::hash<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_map<int, int,
+  std::hash<int>>>::value);
+  }
+
+  {
+    boost::unordered_map m({std::pair<int const, int>(1,2)}, 0,
+  std::hash<int>(), std::equal_to<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_map<int, int,
+  std::hash<int>, std::equal_to<int>>>::value);
+  }
+  */
+
+  {
+    boost::unordered_map m(
+      {std::pair<int const, int>(1, 2)}, 0, f, f, pair_allocator);
+    static_assert(std::is_same<decltype(m),
+      boost::unordered_map<int, int, hash_equals, hash_equals,
+        test_allocator<std::pair<const int, int> > > >::value);
+  }
+
+  /*
+  template<class InputIterator, class Allocator>
+    unordered_map(InputIterator, InputIterator, typename see below::size_type,
+  Allocator)
+      -> unordered_map<iter_key_t<InputIterator>, iter_val_t<InputIterator>,
+                       hash<iter_key_t<InputIterator>>,
+  equal_to<iter_key_t<InputIterator>>,
+                       Allocator>;
+  */
+
+  /* Ambiguous
+  {
+    boost::unordered_map m(x.begin(), x.end(), 0u, pair_allocator);
+    static_assert(std::is_same<decltype(m), boost::unordered_map<int, int,
+  boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  /*
+    template<class InputIterator, class Allocator>
+    unordered_map(InputIterator, InputIterator, Allocator)
+      -> unordered_map<iter_key_t<InputIterator>, iter_val_t<InputIterator>,
+                       hash<iter_key_t<InputIterator>>,
+    equal_to<iter_key_t<InputIterator>>,
+                       Allocator>;
+  */
+
+  /* No constructor:
+  {
+    boost::unordered_map m(x.begin(), x.end(), pair_allocator);
+    static_assert(std::is_same<decltype(m), boost::unordered_map<int, int,
+  boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  /*
+  template<class InputIterator, class Hash, class Allocator>
+    unordered_map(InputIterator, InputIterator, typename see below::size_type,
+  Hash, Allocator)
+      -> unordered_map<iter_key_t<InputIterator>, iter_val_t<InputIterator>,
+  Hash,
+                       equal_to<iter_key_t<InputIterator>>, Allocator>;
+  */
+
+  /* Ambiguous
+  {
+    boost::unordered_map m(x.begin(), x.end(), 0u, f, pair_allocator);
+    static_assert(std::is_same<decltype(m), boost::unordered_map<int, int,
+  hash_equals, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  /*
+    template<class Key, class T, typename Allocator>
+    unordered_map(initializer_list<pair<const Key, T>>, typename see
+    below::size_type,
+                  Allocator)
+      -> unordered_map<Key, T, hash<Key>, equal_to<Key>, Allocator>;
+  */
+
+  /* Ambiguous
+  {
+    boost::unordered_map m({std::pair<int const, int>(1,2)}, 0, pair_allocator);
+    static_assert(std::is_same<decltype(m),boost::unordered_map<int, int,
+  boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  /*
+  template<class Key, class T, typename Allocator>
+    unordered_map(initializer_list<pair<const Key, T>>, Allocator)
+      -> unordered_map<Key, T, hash<Key>, equal_to<Key>, Allocator>;
+  */
+
+  {
+    boost::unordered_map m({std::pair<int const, int>(1, 2)}, pair_allocator);
+    static_assert(std::is_same<decltype(m),
+      boost::unordered_map<int, int, boost::hash<int>, std::equal_to<int>,
+        test_allocator<std::pair<const int, int> > > >::value);
+  }
+
+  /*
+  template<class Key, class T, class Hash, class Allocator>
+    unordered_map(initializer_list<pair<const Key, T>>, typename see
+  below::size_type, Hash,
+                  Allocator)
+      -> unordered_map<Key, T, Hash, equal_to<Key>, Allocator>;
+  */
+
+  /* Ambiguous
+  {
+    boost::unordered_map m({std::pair<int const, int>(1,2)}, 0, f,
+  pair_allocator);
+    static_assert(std::is_same<decltype(m),boost::unordered_map<int, int,
+  boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  // unordered_multimap
+
+  {
+    boost::unordered_multimap m(x.begin(), x.end());
+    static_assert(
+      std::is_same<decltype(m), boost::unordered_multimap<int, int> >::value);
+  }
+
+  /* Ambiguous:
+  {
+    boost::unordered_multimap m(x.begin(), x.end(), 0, std::hash<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_multimap<int, int,
+  std::hash<int>>>::value);
+  }
+
+  {
+    boost::unordered_multimap m(x.begin(), x.end(), 0, std::hash<int>(),
+  std::equal_to<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_multimap<int, int,
+  std::hash<int>, std::equal_to<int>>>::value);
+  }
+  */
+
+  {
+    boost::unordered_multimap m(x.begin(), x.end(), 0, std::hash<int>(),
+      std::equal_to<int>(), pair_allocator);
+    static_assert(std::is_same<decltype(m),
+      boost::unordered_multimap<int, int, std::hash<int>, std::equal_to<int>,
+        test_allocator<std::pair<const int, int> > > >::value);
+  }
+
+  {
+    boost::unordered_multimap m({std::pair<int const, int>(1, 2)});
+    static_assert(
+      std::is_same<decltype(m), boost::unordered_multimap<int, int> >::value);
+  }
+
+  /* Ambiguous
+  {
+    boost::unordered_multimap m({std::pair<int const, int>(1,2)}, 0,
+  std::hash<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_multimap<int, int,
+  std::hash<int>>>::value);
+  }
+
+  {
+    boost::unordered_multimap m({std::pair<int const, int>(1,2)}, 0,
+  std::hash<int>(), std::equal_to<int>());
+    static_assert(std::is_same<decltype(m),boost::unordered_multimap<int, int,
+  std::hash<int>, std::equal_to<int>>>::value);
+  }
+  */
+
+  {
+    boost::unordered_multimap m(
+      {std::pair<int const, int>(1, 2)}, 0, f, f, pair_allocator);
+    static_assert(std::is_same<decltype(m),
+      boost::unordered_multimap<int, int, hash_equals, hash_equals,
+        test_allocator<std::pair<const int, int> > > >::value);
+  }
+
+  /* Ambiguous
+  {
+    boost::unordered_multimap m(x.begin(), x.end(), 0u, pair_allocator);
+    static_assert(std::is_same<decltype(m), boost::unordered_multimap<int, int,
+  boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  /* No constructor:
+  {
+    boost::unordered_multimap m(x.begin(), x.end(), pair_allocator);
+    static_assert(std::is_same<decltype(m), boost::unordered_multimap<int, int,
+  boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  /* Ambiguous
+  {
+    boost::unordered_multimap m(x.begin(), x.end(), 0u, f, pair_allocator);
+    static_assert(std::is_same<decltype(m), boost::unordered_multimap<int, int,
+  hash_equals, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+
+  {
+    boost::unordered_multimap m({std::pair<int const, int>(1,2)}, 0,
+  pair_allocator);
+    static_assert(std::is_same<decltype(m),boost::unordered_multimap<int, int,
+  boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+  int>>>>::value);
+  }
+  */
+
+  {
+    boost::unordered_multimap m(
+      {std::pair<int const, int>(1, 2)}, pair_allocator);
+    static_assert(std::is_same<decltype(m),
+      boost::unordered_multimap<int, int, boost::hash<int>, std::equal_to<int>,
+        test_allocator<std::pair<const int, int> > > >::value);
+  }
+
+/* Ambiguous
+{
+  boost::unordered_multimap m({std::pair<int const, int>(1,2)}, 0, f,
+pair_allocator);
+  static_assert(std::is_same<decltype(m),boost::unordered_multimap<int, int,
+boost::hash<int>, std::equal_to<int>, test_allocator<std::pair<const int,
+int>>>>::value);
+}
+*/
+
+#endif
+}