我知道 BOOL 实际上是有符号字符的 typedef,但是 Boolean 呢?
bool、Boolean 和 BOOL 有什么区别?
Boolean
是一个旧的 Carbon 关键字(历史 Mac 类型),定义为 unsigned char
.BOOL
是一种Objective-C 类型,定义为signed char
.bool
是 _Bool
标准 C 类型的定义版本.它被定义为一个int
.使用 BOOL
.
编辑(2019 年):Apple 在一些 BOOL 的底层实现">新文档.基本上,在 macOS 上,BOOL
最终还是一个 signed char
,但在 iOS 和相关平台上,它是一个原生的 C bool
下面.p>
I know BOOL is actually a typedef of signed char, but what about Boolean?
What is the difference between bool, Boolean and BOOL?
Boolean
is an old Carbon keyword (historic Mac type), defined as an unsigned char
. BOOL
is an Objective-C type defined as signed char
. bool
is a defined version of the _Bool
standard C type. It's defined as an int
. Use BOOL
.
Edit (2019): Apple talks about the underlying implementation of BOOL
in some new documentation. Basically, on macOS, BOOL
is still ultimately a signed char
, but on iOS and related platforms, it a native C bool
underneath.
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