Add global enum constants

rules/S1271/cfamily/metadata.json

@@ -1,5 +1,5 @@
 {
-  "title": "\"::\" operator should be used to access global variables and functions",
+  "title": "\"::\" operator should be used to access global variables, functions and enum constants",
   "type": "CODE_SMELL",
   "code": {
     "impacts": {

rules/S1271/cfamily/rule.adoc

@@ -1,6 +1,6 @@
 == Why is this an issue?
 
-While it is possible to access a global variable or function without using the ``++::++`` operator, it can be considered to be misleading because it might imply to the readers of your code that this is a local or class variable/function and not a global one. Being explicit also allows more freedom in naming local variables without the chance of clashing with global names.
+While it is possible to access a global variable, function or enum constant without using the ``++::++`` operator, it can be considered to be misleading because it might imply to the readers of your code that this is a local or class variable/function/enum constant and not a global one. Being explicit also allows more freedom in naming local variables without the chance of clashing with global names.
 
 
 === Noncompliant code example
@@ -8,10 +8,16 @@ While it is possible to access a global variable or function without using the `
 [source,cpp]
 ----
 int a = 10;
+
+enum Enum {
+  C
+};
+
 int main()
 {
   ...
   int b = a;    // Noncompliant
+  Enum d = C;
   ...
 }
 ----
@@ -22,10 +28,16 @@ int main()
 [source,cpp]
 ----
 int a = 10;
+
+enum Enum {
+  C
+};
+
 int main()
 {
   ...
   int b = ::a;    // Compliant
+  Enum d = ::C;
   ...
 }
 ----
@@ -53,5 +65,6 @@ The variable or function name.
 (visible only on this page)
 
 === relates to: S2209
+=== relates to: S3642
 
 endif::env-github,rspecator-view[]