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The WorldWind Kotlin SDK (WWK) includes the library, examples and tutorials for building multiplatform 3D virtual globe applications for Android, Web and Java.

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package earth.worldwind.util

/**
 * Pool provides an interface for managing a pool of object instances.
 *
 * @param  the pooled type */
interface Pool {
    /**
     * Acquires an instance from the pool. This returns null if the pool is empty.
     *
     * @return an instance from the pool, or null if the pool is empty
     */
    fun acquire(): T?

    /**
     * Releases an instance to the pool. This has no effect if the instance is null.
     *
     * @param instance the instance to release
     */
    fun release(instance: T?)
}