From a45fabad98a0f65e73244485430ea6738ad808ee Mon Sep 17 00:00:00 2001
From: Sergey Prigogin <eclipse.sprigogin@gmail.com>
Date: Wed, 27 Nov 2013 16:21:54 -0800
Subject: [PATCH] Bug 422700 - Name resolution problem with variadic template.

---
 .../cdt/core/parser/tests/ast2/AST2TemplateTests.java  | 10 ++++++++++
 .../cdt/internal/core/dom/parser/cpp/CPPFunction.java  | 10 ++++------
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
index 096f16561c5..451db29d304 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2TemplateTests.java
@@ -4999,6 +4999,16 @@ public class AST2TemplateTests extends AST2TestBase {
 		parseAndCheckBindings();
 	}
 
+	//	template <typename... T>
+	//	struct A {
+	//	  static int waldo(T... p, int q);
+	//	};
+	//
+	//	int x = A<>::waldo(0);
+	public void testVariadicTemplateWithNoArguments_422700() throws Exception {
+		parseAndCheckBindings();
+	}
+
 	//	struct Test {
 	//		void Update() {}
 	//	};
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunction.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunction.java
index 609079c9ed7..088bd9e752f 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunction.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPFunction.java
@@ -43,7 +43,6 @@ import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTDeclSpecifier;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionDeclarator;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTFunctionDefinition;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTInitializerClause;
-import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTQualifiedName;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPBlockScope;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassScope;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPFunction;
@@ -602,19 +601,18 @@ public class CPPFunction extends PlatformObject implements ICPPFunction, ICPPInt
 	}
 
 	public static int getRequiredArgumentCount(ICPPParameter[] pars) {
-		int result= pars.length;
-		while (result > 0) {
-			final ICPPParameter p = pars[result - 1];
+		int result = pars.length;
+		for (int i = pars.length; --i >= 0;) {
+			final ICPPParameter p = pars[i];
 			if (p.hasDefaultValue() || p.isParameterPack()) {
 				result--;
 			} else {
 				if (pars.length == 1 && SemanticUtil.isVoidType(p.getType())) {
 					return 0;
 				}
-				return result;
 			}
 		}
-		return 0;
+		return result;
 	}
 
 	@Override