C++, add missing isPack for some template params

Fixes sphinx-doc/sphinx#5126

CHANGES

@@ -207,6 +207,7 @@ Bugs fixed
 * epub: spine has been broken when "self" is listed on toctree (refs: #4611)
 * #344: autosummary does not understand docstring of module level attributes
 * #5191: C++, prevent nested declarations in functions to avoid lookup problems.
+* #5126: C++, add missing isPack method for certain template parameter types.
 * #5002: graphviz: SVGs do not adapt to the column width
 
 Testing

sphinx/domains/cpp.py

@@ -1492,6 +1492,10 @@ class ASTTemplateParamConstrainedTypeWithInit(ASTBase):
         # type: () -> ASTNestedName
         return self.type.name
 
+    @property
+    def isPack(self):
+        return self.type.isPack
+
     def get_id(self, version, objectType=None, symbol=None):
         # type: (int, unicode, Symbol) -> unicode
         # this is not part of the normal name mangling in C++
@@ -1531,6 +1535,10 @@ class ASTTemplateParamTemplateType(ASTBase):
         id = self.get_identifier()
         return ASTNestedName([ASTNestedNameElement(id, None)], [False], rooted=False)
 
+    @property
+    def isPack(self):
+        return self.data.parameterPack
+
     def get_identifier(self):
         # type: () -> unicode
         return self.data.get_identifier()
@@ -1567,6 +1575,10 @@ class ASTTemplateParamNonType(ASTBase):
         id = self.get_identifier()
         return ASTNestedName([ASTNestedNameElement(id, None)], [False], rooted=False)
 
+    @property
+    def isPack(self):
+        return self.param.isPack
+
     def get_identifier(self):
         # type: () -> unicode
         name = self.param.name
@@ -2635,6 +2647,10 @@ class ASTDeclaratorRef(ASTBase):
         # type: () -> ASTNestedName
         return self.next.name
 
+    @property
+    def isPack(self):
+        return True
+
     @property
     def function_params(self):
         # type: () -> Any
@@ -2916,6 +2932,10 @@ class ASTDeclaratorNameParamQual(ASTBase):
         # type: () -> ASTNestedName
         return self.declId
 
+    @property
+    def isPack(self):
+        return False
+
     @property
     def function_params(self):
         # type: () -> Any
@@ -3014,6 +3034,10 @@ class ASTType(ASTBase):
         # type: () -> ASTNestedName
         return self.decl.name
 
+    @property
+    def isPack(self):
+        return self.decl.isPack
+
     @property
     def function_params(self):
         # type: () -> Any
@@ -3105,6 +3129,10 @@ class ASTTypeWithInit(ASTBase):
         # type: () -> ASTNestedName
         return self.type.name
 
+    @property
+    def isPack(self):
+        return self.type.isPack
+
     def get_id(self, version, objectType=None, symbol=None):
         # type: (int, unicode, Symbol) -> unicode
         if objectType != 'member':