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+// testusing.hh --- semantic-ia-utest completion engine unit tests
+
+// Copyright (C) 2008-2021 Free Software Foundation, Inc.
+
+// Author: Eric M. Ludlam <zappo@gnu.org>
+
+// This file is part of GNU Emacs.
+
+// GNU Emacs is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// GNU Emacs is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace moose {
+
+  class Point;
+
+  class MyClass;
+
+}
+
+
+namespace moose {
+
+  class Point;
+
+  class MyClass {
+  public:
+    MyClass() : fVal(0) {
+    }
+
+    ~MyClass() {};
+
+    /**
+     * fVal Accessors
+     * @{
+     */
+    int getVal() const {
+      return fVal;
+    }
+    void setVal(int Val) const {
+      fVal = Val;
+    }
+    /**
+     * @}
+     */
+
+  private:
+    int fVal;
+  };
+
+}
+
+namespace togglemoose {
+
+  class MyOtherClass {
+  public:
+    int testToggle1();
+    int testToggle2();
+    int testToggle3();
+  };
+}
+
+namespace deer {
+
+  class Pickle;
+
+};
+
+// Code from Zhiqiu Kong
+
+#ifndef BREAD_H
+#define BREAD_H
+
+namespace bread_name {
+  class bread
+  {
+  public:
+    void geta();
+  private:
+    int m_a;
+    int m_b;
+  };
+}
+
+#endif
+
+// Code from David Engster
+// Creating alias types through 'using' trickery
+
+namespace somestuff {
+  class OneClass {
+  public:
+    void aFunc();
+    int anInt;
+  };
+  struct aStruct {
+    int foo;
+    int bar;
+  };
+}
+
+namespace otherstuff {
+  // make otherstuff::OneClass an alias for somestuff::OneClass
+  using somestuff::OneClass;
+}
+
+namespace morestuff {
+  // make morestuff an alias namespace for somestuff
+  using namespace somestuff;
+  // but hide aStruct with own type
+  struct aStruct {
+    int anotherFoo;
+    int anotherBar;
+  };
+}
+
+// We can also create an alias for an alias
+namespace evenmorestuff {
+  using otherstuff::OneClass;
+}
+
+// Now with nested namespaces
+namespace outer {
+  namespace inner {
+    struct StructNested {
+      int one;
+      int two;
+    };
+    struct AnotherStruct {
+      int three;
+      int four;
+    };
+  }
+}
+
+// Namespace which pulls in one of its own nested namespaces
+namespace first {
+  class AAA1;
+  namespace second {
+    class AAA2;
+  }
+  // Elevate nested namespace into first one
+  using namespace second;
+}
+
+namespace third {
+  using namespace first;
+  class AAA3;
+}
+
+
+// Elevate the first struct into 'outer'
+// so that we can access it via 'outer::StructNested'
+namespace outer {
+  using outer::inner::StructNested;
+}
+
+// Create an alias for a nested namespace
+namespace outerinner {
+  // equivalent to 'namespace outerinner = outer::inner;'
+  using namespace outer::inner;
+}
+
+// Create namespace alias
+namespace alias_for_somestuff = somestuff;
+// Same for nested namespace
+namespace alias_for_outerinner = outer::inner;