swift generics 泛型

// 泛型函数

funcrepeat<ItemType>(item:ItemType,count:Int)->[ItemType] {

varresult = [ItemType]();

foriin0..<count {

result.append(item);

}

returnresult;

}

varre =repeat("zxh",4);

println(re);

//泛型枚举

enumOPtion<T>{

caseNone

caseSome(T)

}

varop:OPtion<Int> = .None;

op= .Some(100);

//泛型类

classca<T>{

varv:T;

init(val:T){

v= val;

println(v);

}

}

varcaval =ca<Double>(val:2.2);