本文探讨了在迭代器操作中使用前置递增操作符（++pos）而非后置递增操作符（pos++）的原因。前置递增通常提供更好的性能，因为它避免了创建临时对象来保存旧位置。
prefer ++pos over pos++
This is because it might have better
performance than the postincrement operator. The latter involves a temporary object because it
must return the old position of the iterator. For this reason, it generally is best to prefer ++pos
over pos++.
This is because it might have better
performance than the postincrement operator. The latter involves a temporary object because it
must return the old position of the iterator. For this reason, it generally is best to prefer ++pos
over pos++.
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