comphelper: add a generic implementation of std container operator==

... that contain std::unique_ptr.  With C++11 variadic templates this
apparently works for both std::vector and std::set; associative
containers like std::map have different iterators so need a different
implementation.

Change-Id: I6872445b007875c310d08fa7a8d7311075880b1d
Reviewed-on: https://gerrit.libreoffice.org/19818Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

include/comphelper/stl_types.hxx

@@ -100,6 +100,29 @@ template<class T> struct UniquePtrValueLess
         }
 };
 
+/// by-value implementation of std::foo<std::unique_ptr<T>>::operator==
+template<template<typename, typename...> class C, typename T, typename... Etc>
+bool ContainerUniquePtrEquals(
+        C<std::unique_ptr<T>, Etc...> const& lhs,
+        C<std::unique_ptr<T>, Etc...> const& rhs)
+{
+    if (lhs.size() != rhs.size())
+    {
+        return false;
+    }
+    for (auto iter1 = lhs.begin(), iter2 = rhs.begin();
+         iter1 != lhs.end();
+         ++iter1, ++iter2)
+    {
+        if (!(**iter1 == **iter2))
+        {
+            return false;
+        }
+    }
+    return true;
+};
+
+
 /** STL-compliant structure for comparing Reference&lt; &lt;iface&gt; &gt; instances
 */
 template < class IAFCE >

sc/source/core/tool/dbdata.cxx

@@ -34,6 +34,8 @@
 #include "dociter.hxx"
 #include "brdcst.hxx"
 
+#include <comphelper/stl_types.hxx>
+
 #include <memory>
 #include <utility>
 
@@ -1169,18 +1171,7 @@ size_t ScDBCollection::NamedDBs::size() const
 
 bool ScDBCollection::NamedDBs::operator== (const NamedDBs& r) const
 {
-    if (m_DBs.size() != r.m_DBs.size())
-    {
-        return false;
-    }
-    for (auto iter1 = m_DBs.begin(), iter2 = r.m_DBs.begin(); iter1 != m_DBs.end(); ++iter1, ++iter2)
-    {
-        if (**iter1 != **iter2)
-        {
-            return false;
-        }
-    }
-    return true;
+    return ::comphelper::ContainerUniquePtrEquals(m_DBs, r.m_DBs);
 }
 
 ScDBCollection::AnonDBs::iterator ScDBCollection::AnonDBs::begin()
@@ -1257,14 +1248,7 @@ bool ScDBCollection::AnonDBs::has( const ScDBData* p ) const
 
 bool ScDBCollection::AnonDBs::operator== (const AnonDBs& r) const
 {
-    if (m_DBs.size() != r.m_DBs.size())
-        return false;
-    for (auto iter1 = begin(), iter2 = r.begin(); iter1 != end(); ++iter1, ++iter2)
-    {
-        if (**iter1 != **iter2)
-            return false;
-    }
-    return true;
+    return ::comphelper::ContainerUniquePtrEquals(m_DBs, r.m_DBs);
 }
 
 ScDBCollection::AnonDBs::AnonDBs()