$cast
摘要:$cast可以作为task,也可以作为function。作为task时,当cast失败,会产生runtime error, 作为function时,cast成功返回1,失败返回0,不会产生runtime error。$cast是动态类型转换,只在runtime check,而静态类型转换是compi
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posted @ 2018-09-27 14:38
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