Generic Instance Method 総称体インスタンスメソッド

enumerateSubstrings(in:options:_:)

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Declaration 宣言 

func enumerateSubstrings<R>(in range: R, options opts: String.EnumerationOptions = [], _ body: @escaping (_ substring: String?, _ substringRange: Range<Self.Index>, _ enclosingRange: Range<Self.Index>, inout Bool) -> Void) where R : RangeExpression, R.Bound == String.Index