return new ConcurrentSkipListMap<>();
    }

    /**
     * {@link ConcurrentSkipListMap}の新しいインスタンスを作成して返します。
     *
     * @param <K>
     *            {@link ConcurrentSkipListMap}のキーの型
     * @param <V>
     *            {@link ConcurrentSkipListMap}の値の型
     * @param c
     *            {@link Comparator}
     * @return {@link ConcurrentSkipListMap}の新しいインスタンス

     * <li>A {@link File}. Interpreted relative to the project directory, as per {@link #file(Object)}.</li>
     *
     * <li>A {@link java.nio.file.Path}, as per {@link #file(Object)}.</li>
     *
     * <li>A {@link java.net.URI} or {@link java.net.URL}. The URL's path is interpreted as a file path. Only {@code file:} URLs are supported.</li>
     *
     * <li>A {@link org.gradle.api.file.Directory} or {@link org.gradle.api.file.RegularFile}.</li>

 * maximumSize}, {@link #maximumWeight(long) maximumWeight}, {@link #expireAfterWrite
 * expireAfterWrite}, {@link #expireAfterAccess expireAfterAccess}, {@link #weakKeys weakKeys},
 * {@link #weakValues weakValues}, or {@link #softValues softValues} are requested.
 *
 * <p>If {@link #maximumSize(long) maximumSize} or {@link #maximumWeight(long) maximumWeight} is

 * similar to those in this class for non-precondition checks.
 *
 * <h3>{@code java.util.Objects.requireNonNull()}</h3>
 *
 * <p>Projects which use {@code com.google.common} should generally avoid the use of {@link
 * java.util.Objects#requireNonNull(Object)}. Instead, use whichever of {@link

 * similar to those in this class for non-precondition checks.
 *
 * <h3>{@code java.util.Objects.requireNonNull()}</h3>
 *
 * <p>Projects which use {@code com.google.common} should generally avoid the use of {@link
 * java.util.Objects#requireNonNull(Object)}. Instead, use whichever of {@link

[[sec:building_cunit_executables]]
=== Building CUnit executables

   * method provides a {@link Set} implementation corresponding to any {@link Map} implementation.
   * There is no need to use this method on a {@link Map} implementation that already has a
   * corresponding {@link Set} implementation (such as {@link java.util.HashMap} or {@link
   * java.util.TreeMap}).
   *

   * method provides a {@link Set} implementation corresponding to any {@link Map} implementation.
   * There is no need to use this method on a {@link Map} implementation that already has a
   * corresponding {@link Set} implementation (such as {@link java.util.HashMap} or {@link
   * java.util.TreeMap}).
   *

/**
 * An abstract implementation of {@link ListenableFuture}, intended for advanced users only. More
 * common ways to create a {@code ListenableFuture} include instantiating a {@link SettableFuture},
 * submitting a task to a {@link ListeningExecutorService}, and deriving a {@code Future} from an
 * existing one, typically using methods like {@link Futures#transform(ListenableFuture,

/**
 * An abstract implementation of {@link ListenableFuture}, intended for advanced users only. More
 * common ways to create a {@code ListenableFuture} include instantiating a {@link SettableFuture},
 * submitting a task to a {@link ListeningExecutorService}, and deriving a {@code Future} from an
 * existing one, typically using methods like {@link Futures#transform(ListenableFuture,