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// Nesting a namespace.

namespace Chapter15

{

namespace My3DShapes

{

// 3D Circle class

class Circle{ }

// 3D Hexagon class

class Hexagon{ }

// 3D Square class

class Square{ }

}

}

In many cases, the role of a root namespace is simply to provide a further level of scope, and

therefore may not define any types directly within its scope (as in the case of the Chapter15 name-

space). If this is the case, a nested namespace can be defined using the following compact form:

// Nesting a namespace (take two).

namespace Chapter15.My3DShapes

{

// 3D Circle class

class Circle{ }

// 3D Hexagon class

class Hexagon{ }

// 3D Square class

class Square{ }

}

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---

Given that you have now nested the My3DShapes namespace within the Chapter15 root name-

space, you need to update any existing using directives and type aliases:

using Chapter15.My3DShapes;

using The3DHexagon = Chapter15.My3DShapes.Hexagon;