Taking a multivitamin every day for two years appears to slow some markers of biological ageing – albeit to a small degree, research suggests.
Mean: 57.321 ms | 5.551 ms，更多细节参见wps
Елизавета Гринберг (редактор)。业内人士推荐谷歌作为进阶阅读
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.