概述我试图转换以下 Swift 2.3代码： //Example usage://(0 ..< 778).binarySearch { $0 < 145 } // 145extension CollectionType where Index: RandomAccessIndexType {    /// Finds such index N that predicate is true fo                         我试图转换以下  Swift 2.3代码：      
//Example usage://(0 ..< 778).binarySearch { 
//Example usage://(0 ..< 778).binarySearch { 
extension Collection {    func binarySearch(predicate: (Iterator.Element) -> Bool) -> Index {        var low = startIndex        var high = endindex        while low != high {            let mID = index(low,offsetBy: distance(from: low,to: high)/2)            if predicate(self[mID]) {                low = index(after: mID)            } else {                high = mID            }        }        return low    }}

< 145 } // 145extension Collection where Index: StrIDeable { /// Finds such index N that predicate is true for all elements up to /// but not including the index N,and is false for all elements /// starting with index N. /// Behavior is undefined if there is no such N. func binarySearch(predicate: (Generator.Element) -> Bool) -> Index { var low = startIndex var high = endindex while low != high { let mID = low.advanced(by: low.distance(to: high) / 2) if predicate(self[mID]) { low = mID.advanced(to: 1) } else { high = mID } } return low }}

< 145 } // 145extension CollectionType where Index: RandomAccessIndexType { /// Finds such index N that predicate is true for all elements up to /// but not including the index N,and is false for all elements /// starting with index N. /// Behavior is undefined if there is no such N. func binarySearch(predicate: Generator.Element -> Bool) -> Index { var low = startIndex var high = endindex while low != high { let mID = low.advancedBy(low.distanceto(high) / 2) if predicate(self[mID]) { low = mID.advancedBy(1) } else { high = mID } } return low }}

进入Swift 3如下：

错误

Binary operator ‘/’ cannot be applIEd to operands of type ‘self.Index.StrIDe’ and ‘Int’

抛出让mID = low.advanced(by：low.distance(to：high)/ 2)

有关如何修复它的任何帮助？
在Swift 3中,“集合移动他们的索引”,比较

关于Swift进化的 A New Model for Collections and Indices.特别是,您不要在索引上调用advancedBy(),

但是在集合上使用index()方法来推进索引.

所以你的方法将在Swift 3中实现

不需要对索引类型进行任何限制.

总结

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