Objective-C的：BOOL VS布尔 [英] Objective-C : BOOL vs bool

问题描述

我看到了新型 BOOL （是， NO ）。

我读到这一类几乎就像一个char。

I read that this type is almost like a char.

有关测试我所做的：

NSLog(@"Size of BOOL %d", sizeof(BOOL));
NSLog(@"Size of bool %d", sizeof(bool));

高兴地看到，这两个日志显示1（有时在C ++中BOOL是int和它的sizeof为4）

Good to see that both logs display "1" (sometimes in C++ bool is an int and its sizeof is 4)

所以，我只是想知道，如果有一些问题，bool类型什么的？

So I was just wondering if there were some issues with the bool type or something ?

我可以只使用布尔（即似乎工作）不失速度？

Can I just use bool (that seems to work) without losing speed?

推荐答案

从定义 objc.h ：

#if (TARGET_OS_IPHONE && __LP64__)  ||  TARGET_OS_WATCH
typedef bool BOOL;
#else
typedef signed char BOOL; 
// BOOL is explicitly signed so @encode(BOOL) == "c" rather than "C" 
// even if -funsigned-char is used.
#endif

#define YES ((BOOL)1)
#define NO  ((BOOL)0)

所以，是的，你可以假设布尔是一个字符。您可以使用（C99）布尔类型，但所有苹果的Objective-C框架和大部分的Objective-C /可可code使用BOOL，所以你可以节省自己头痛，如果有史以来的typedef仅仅使用BOOL变化。

So, yes, you can assume that BOOL is a char. You can use the (C99) bool type, but all of Apple's Objective-C frameworks and most Objective-C/Cocoa code uses BOOL, so you'll save yourself headache if the typedef ever changes by just using BOOL.

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