Created
March 18, 2014 02:31
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http://d.hatena.ne.jp/Nagise/20140315/1394884271 の、Iterator, Iterableを一個のクラスにまとめて実装してしまうのは .iterator() を複数回呼び出したときに問題があるので匿名クラスを使った実装を書いてみました。
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public static <T1,T2> Iterable<Tuple<T1,T2>> zip ( | |
final Iterable<? extends T1> src1, | |
final Iterable<? extends T2> src2) { | |
return new Iterable<Tuple<T1, T2>>() { | |
@Override | |
public Iterator<Tuple<T1, T2>> iterator() { | |
final Iterator<? extends T1> iterator1 = src1.iterator(); | |
final Iterator<? extends T2> iterator2 = src2.iterator(); | |
return new Iterator<Tuple<T1, T2>>() { | |
@Override | |
public boolean hasNext() { | |
boolean n1 = iterator1.hasNext(); | |
boolean n2 = iterator2.hasNext(); | |
if (n1 != n2) { | |
throw new IllegalStateException("個数の不一致"); | |
} | |
return n1; | |
} | |
@Override | |
public Tuple<T1, T2> next() { | |
return new Tuple<T1, T2>(iterator1.next(), iterator2.next()); | |
} | |
@Override | |
public void remove() { | |
iterator1.remove(); | |
iterator2.remove(); | |
} | |
}; | |
} | |
}; | |
} |
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