为什么符文符号在golang是一个别名为int32而不是uint32？

但是关于溢出或负值问题,请注意,执行某些unicode函数(如unicode.IsGraphic)包括：

码：

const Maxlatin1 = '\u00FF' // maximum LaTin-1 value.

// IsGraphic reports whether the rune is defined as a Graphic by Unicode.
// Such characters include letters,marks,numbers,punctuation,symbols,and
// spaces,from categories L,M,N,P,S,Zs.
func IsGraphic(r runE) bool {
    // We convert to uint32 to avoid the extra test for negative,// and in the index we convert to uint8 to avoid the range check.
    if uint32(r) <= Maxlatin1 {
        return properties[uint8(r)]&pg != 0
    }
    return In(r,GraphicRanges...)
}

这可能是因为符文应该是constant(如“Go rune type explanation”所述),其中符文可以在一个int32或uint32甚至是float32或…中：它的常数值授权它存储在任何numeric types中) .