C++, add support for user-defined literals

CHANGES

@@ -70,6 +70,7 @@ Bugs fixed
 * C++, add support for final classes.
 * C++, fix parsing of types prefixed with 'enum'.
 * #2023: Dutch search support uses Danish stemming info
+* C++, add support for user-defined literals.
 
 Documentation
 -------------

sphinx/domains/cpp.py

@@ -821,6 +821,31 @@ class ASTOperatorType(ASTBase):
             signode += addnodes.desc_addname(identifier, identifier)
 
 
+class ASTOperatorLiteral(ASTBase):
+    def __init__(self, identifier):
+        self.identifier = identifier
+
+    def is_operator(self):
+        return True
+
+    def get_id_v1(self):
+        raise NoOldIdError()
+
+    def get_id_v2(self):
+        return u'li' + self.identifier.get_id_v2()
+
+    def __unicode__(self):
+        return u'operator""' + text_type(self.identifier)
+
+    def describe_signature(self, signode, mode, env, prefix, symbol):
+        _verify_description_mode(mode)
+        identifier = text_type(self)
+        if mode == 'lastIsName':
+            signode += addnodes.desc_name(identifier, identifier)
+        else:
+            signode += addnodes.desc_addname(identifier, identifier)
+
+
 class ASTTemplateArgConstant(ASTBase):
     def __init__(self, value):
         self.value = value
@@ -2525,6 +2550,14 @@ class DefinitionParser(object):
                 op += '[]'
             return ASTOperatorBuildIn(op)
 
+        # user-defined literal?
+        if self.skip_string('""'):
+            self.skip_ws()
+            if not self.match(_identifier_re):
+                self.fail("Expected user-defined literal suffix.")
+            identifier = ASTIdentifier(self.matched_text)
+            return ASTOperatorLiteral(identifier)
+
         # oh well, looks like a cast operator definition.
         # In that case, eat another type.
         type = self._parse_type(named=False, outer="operatorCast")

tests/test_domain_cpp.py

@@ -347,6 +347,9 @@ def test_operators():
     check('function', 'void operator ! ()',
           "not-operator", "ntv", output='void operator!()')
 
+    check('function', 'void operator "" _udl()',
+           None, 'li4_udlv', output='void operator""_udl()')
+
 #def test_print():
 #    # used for getting all the ids out for checking
 #    for a in ids: