Add std::initializer_list to the following containers:

* deque
* map
* multimap
* set
* multiset
* list
* slist

Tested on clant and g++

test/list_test.cpp

@@ -115,6 +115,35 @@ int test_cont_variants()
    return 0;
 }
 
+bool test_support_for_initializer_list()
+{
+#if !defined(BOOST_NO_CXX11_HDR_INITIALIZER_LIST)
+   const std::initializer_list<int> il = {1, 10};
+   const list<int> expectedList(il.begin(), il.end());
+
+   const list<int> testConstructor = il;
+   if(testConstructor != expectedList)
+      return false;
+
+   list<int> testAssignOperator = {10, 11};
+   testAssignOperator = il;
+   if(testAssignOperator != expectedList)
+      return false;
+
+   list<int> testAssignMethod = {99};
+   testAssignMethod = il;
+   if(testAssignMethod != expectedList)
+      return false;
+
+   list<int> testInsertMethod;
+   testInsertMethod.insert(testInsertMethod.cbegin(), il);
+   if(testInsertMethod != testInsertMethod)
+      return false;
+
+   return true;
+#endif
+   return true;
+}
 
 int main ()
 {
@@ -166,6 +195,9 @@ int main ()
    if(!boost::container::test::test_propagate_allocator<list>())
       return 1;
 
+   if(!test_support_for_initializer_list())
+      return 1;
+
    return 0;
 }