Clang: Fix operator <

It is actually not used but have to be implemented because
QMetaType::registerComparators expect == and <.

Change-Id: Ia93e2e7bd856d1962b683482e42ace4136d9bf34
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/libs/codemodelbackendipc/cmbregisterprojectsforcodecompletioncommand.cpp

@@ -36,6 +36,10 @@
 
 #include <ostream>
 
+#include <algorithm>
+
+#include <container_common.h>
+
 namespace CodeModelBackEnd {
 
 RegisterProjectPartsForCodeCompletionCommand::RegisterProjectPartsForCodeCompletionCommand(const QVector<ProjectPartContainer> &projectContainers)
@@ -69,7 +73,7 @@ bool operator==(const RegisterProjectPartsForCodeCompletionCommand &first, const
 
 bool operator<(const RegisterProjectPartsForCodeCompletionCommand &first, const RegisterProjectPartsForCodeCompletionCommand &second)
 {
-    return first.projectContainers_ < second.projectContainers_;
+    return compareContainer(first.projectContainers_, second.projectContainers_);
 }
 
 QDebug operator<<(QDebug debug, const RegisterProjectPartsForCodeCompletionCommand &command)

src/libs/codemodelbackendipc/cmbregistertranslationunitsforcodecompletioncommand.cpp

@@ -36,6 +36,8 @@
 
 #include <ostream>
 
+#include <container_common.h>
+
 namespace CodeModelBackEnd {
 
 RegisterTranslationUnitForCodeCompletionCommand::RegisterTranslationUnitForCodeCompletionCommand(const QVector<FileContainer> &fileContainers)
@@ -69,7 +71,7 @@ bool operator==(const RegisterTranslationUnitForCodeCompletionCommand &first, co
 
 bool operator<(const RegisterTranslationUnitForCodeCompletionCommand &first, const RegisterTranslationUnitForCodeCompletionCommand &second)
 {
-    return first.fileContainers_ < second.fileContainers_;
+    return compareContainer(first.fileContainers_, second.fileContainers_);
 }
 
 QDebug operator<<(QDebug debug, const RegisterTranslationUnitForCodeCompletionCommand &command)

src/libs/codemodelbackendipc/cmbunregisterprojectsforcodecompletioncommand.cpp

@@ -36,6 +36,8 @@
 
 #include <ostream>
 
+#include <container_common.h>
+
 namespace CodeModelBackEnd {
 
 
@@ -70,7 +72,7 @@ bool operator==(const UnregisterProjectPartsForCodeCompletionCommand &first, con
 
 bool operator<(const UnregisterProjectPartsForCodeCompletionCommand &first, const UnregisterProjectPartsForCodeCompletionCommand &second)
 {
-    return first.filePaths_ < second.filePaths_;
+    return compareContainer(first.filePaths_, second.filePaths_);
 }
 
 QDebug operator<<(QDebug debug, const UnregisterProjectPartsForCodeCompletionCommand &command)

src/libs/codemodelbackendipc/cmbunregistertranslationunitsforcodecompletioncommand.cpp

@@ -38,6 +38,8 @@
 
 #include <QDataStream>
 
+#include <container_common.h>
+
 namespace CodeModelBackEnd {
 
 
@@ -72,7 +74,7 @@ bool operator==(const UnregisterTranslationUnitsForCodeCompletionCommand &first,
 
 bool operator<(const UnregisterTranslationUnitsForCodeCompletionCommand &first, const UnregisterTranslationUnitsForCodeCompletionCommand &second)
 {
-    return first.fileContainers_ < second.fileContainers_;
+    return compareContainer(first.fileContainers_, second.fileContainers_);
 }
 
 QDebug operator<<(QDebug debug, const UnregisterTranslationUnitsForCodeCompletionCommand &command)

src/libs/codemodelbackendipc/codemodelbackendipc-lib.pri

@@ -67,6 +67,7 @@ HEADERS += $$PWD/codemodelbackendipc_global.h \
     $$PWD/translationunitdoesnotexistcommand.h \
     $$PWD/codecompletionchunk.h \
     $$PWD/projectpartcontainer.h \
-    $$PWD/projectpartsdonotexistcommand.h
+    $$PWD/projectpartsdonotexistcommand.h \
+    $$PWD/container_common.h
 
 contains(QT_CONFIG, reduce_exports):CONFIG += hide_symbols

src/libs/codemodelbackendipc/container_common.h

@@ -0,0 +1,62 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company.  For licensing terms and
+** conditions see http://www.qt.io/terms-conditions.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef CONTAINER_COMMON_H
+#define CONTAINER_COMMON_H
+
+
+namespace CodeModelBackEnd {
+
+template <typename Container>
+bool compareContainer(const Container &first, const Container &second)
+{
+    if (first.size() != second.size())
+        return first.size() < second.size();
+
+    Container firstCopy = first;
+    Container secondCopy = second;
+
+    std::sort(firstCopy.begin(), firstCopy.end());
+    std::sort(secondCopy.begin(), secondCopy.end());
+
+    auto isProjectPartContainerSmaller = [] (decltype(*first.cbegin()) &firstElement,
+                                             decltype(*second.cbegin()) &secondElement) {
+        return firstElement < secondElement;
+    };
+
+    return std::equal(firstCopy.cbegin(),
+                      firstCopy.cend(),
+                      secondCopy.cbegin(),
+                      isProjectPartContainerSmaller);
+}
+}
+
+#endif // CONTAINER_COMMON_H
+