SummaryIf you want to have good performance for your singleton implementation and you need to provide a constructor, you should go for the static data member implementation. In case you can default the default constructor, the two implementation strategies are equivalent performancewise. I would suggest using the block local approach as it saves having to define and initialize the singleton object in an implementation file.
（一）正常履行拖航合同或者其他服务合同的义务进行救助的，但是提供不属于履行上述义务的特殊劳务除外；。新收录的资料是该领域的重要参考
be sent there automatically... and then when you needed a little walking around，这一点在新收录的资料中也有详细论述
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