C++, fix parsing of types prefixed with 'enum'.

Fixes breathe-doc/breathe#223.

Author: jakobandersen

CHANGES

@@ -68,6 +68,7 @@ Bugs fixed
 * C++, add missing support for 'friend' functions.
 * C++, add missing support for virtual base classes (thanks to Rapptz).
 * C++, add support for final classes.
+* C++, fix parsing of types prefixed with 'enum'.
 
 Documentation
 -------------

sphinx/domains/cpp.py

@@ -38,7 +38,9 @@
     All versions are generated and attached to elements. The newest is used for
     the index. All of the versions should work as permalinks.
 
-    See http://www.nongnu.org/hcb/ for the grammar.
+    See http://www.nongnu.org/hcb/ for the grammar,
+    or https://github.com/cplusplus/draft/blob/master/source/grammar.tex
+    for the newest grammar.
 
     common grammar things:
         template-declaration ->
@@ -2387,7 +2389,7 @@ class DefinitionParser(object):
         'float', 'double', 'auto'
     )
 
-    _prefix_keys = ('class', 'struct', 'union', 'typename')
+    _prefix_keys = ('class', 'struct', 'enum', 'union', 'typename')
 
     def __init__(self, definition, warnEnv):
         self.definition = definition.strip()

tests/test_domain_cpp.py

@@ -226,6 +226,13 @@ def test_type_definitions():
     check('function', 'friend std::ostream &f(std::ostream&, int)',
           'f__osR.i', '1fRNSt7ostreamEi')
 
+    # from breathe#223
+    check('function', 'void f(struct E e)', 'f__E', '1f1E')
+    check('function', 'void f(class E e)', 'f__E', '1f1E')
+    check('function', 'void f(typename E e)', 'f__E', '1f1E')
+    check('function', 'void f(enum E e)', 'f__E', '1f1E')
+    check('function', 'void f(union E e)', 'f__E', '1f1E')
+
     check('class', 'public A', "A", "1A", output='A')
     check('class', 'private A', "A", "1A")