C++, parse 'this' in expressions.

CHANGES

@@ -36,6 +36,7 @@ Bugs fixed
 * #4577: Enumerated sublists with explicit start with wrong number
 * #4641: A external link in TOC cannot contain "?" with ``:glob:`` option
 * C++, add missing parsing of explicit casts and typeid in expression parsing.
+* C++, add missing parsing of ``this`` in expression parsing.
 
 Testing
 --------

sphinx/domains/cpp.py

@@ -784,6 +784,17 @@ class ASTStringLiteral(ASTBase):
         signode.append(nodes.Text(txt, txt))
 
 
+class ASTThisLiteral(ASTBase):
+    def __unicode__(self):
+        return "this"
+
+    def get_id(self, version):
+        return "fpT"
+
+    def describe_signature(self, signode, mode, env, symbol):
+        signode.append(nodes.Text("this"))
+
+
 class ASTParenExpr(ASTBase):
     def __init__(self, expr):
         self.expr = expr
@@ -4124,7 +4135,10 @@ class DefinitionParser(object):
         res = self._parse_literal()
         if res is not None:
             return res
-        # TODO: try 'this' and lambda expression
+        self.skip_ws()
+        if self.skip_word("this"):
+            return ASTThisLiteral()
+        # TODO: try lambda expression
         res = self._parse_fold_or_paren_expression()
         if res is not None:
             return res

tests/test_domain_cpp.py

@@ -126,6 +126,7 @@ def test_expressions():
         expr = '5.0' + suffix
         exprCheck(expr, 'L' + expr + 'E')
     exprCheck('"abc\\"cba"', 'LA8_KcE')  # string
+    exprCheck('this', 'fpT')
     # TODO: test the rest
     exprCheck('(... + Ns)', '(... + Ns)')
     exprCheck('(5)', 'L5E')