为什么io.WriterTo的WriteTo方法返回int64而不是int? [英] Why does io.WriterTo's WriteTo method return an int64 rather than an int?

问题描述

Go的io包中的大多数输出​​方法都返回(int, error)，例如io.Writer的Write([]byte)方法和io.WriteString(io.Writer, string)函数.但是，某些输出方法(例如io.WriterTo的WriteTo方法)将返回(int64, error).这使得根据Write或WriteString来实现WriteTo而不存储中间值并将其从int转换为int64的类型非常不便.这种差异的原因是什么?

Most of the output methods in Go's io package return (int, error), for example io.Writer's Write([]byte) method and the io.WriteString(io.Writer, string) function. However, a few of the output methods, such as io.WriterTo's WriteTo method, return (int64, error) instead. This makes it inconvenient to implement WriteTo in terms of Write or WriteString without storing an intermediate value and type converting it from int to int64. What is the reason for this discrepancy?

推荐答案

WriteTo可能复制了超过int32字节的数据.

It's possible that WriteTo copies more than int32 bytes of data.

使用io.Reader和io.Writer接口，数据量受给定切片的大小限制，对于当前体系结构，切片的长度受int限制.

With the io.Readerand io.Writer interfaces, the amount of data is limited by the size of the given slice, which has a length limited by int for the current architecture.

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