boolean_t t;Boolean tt;BOOL ttt;bool tttt;這四種布爾類型有什么區(qū)別？
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TA貢獻1865條經(jīng)驗 獲得超7個贊
typedef signed char BOOL;
// BOOL is explicitly signed so @encode(BOOL) == "c" rather than "C"
// even if -funsigned-char is used.
define OBJC_BOOL_DEFINED
define YES (BOOL)1
define NO (BOOL)0
阿波羅的戰(zhàn)車
TA貢獻1862條經(jīng)驗 獲得超6個贊
bool 是int
BOOL 是char
bool b1 當b1>0 就＝YES
BOOL b2 當b2=1 才＝YES
所以框架都用BOOL
Boolean mac os上有歷史意義的類型
Boolean types and values Boolean Mac OS historic type, sizeof(Boolean)==1 bool Defined in stdbool.h, ISO C/C++ standard type false Now defined in stdbool.h true Now defined in stdbool.h
boolean_t i386
/* * File: boolean.h * * Boolean type, for I386. */#ifndef _MACH_I386_BOOLEAN_H_#define _MACH_I386_BOOLEAN_H_#if defined(__x86_64__) && !defined(KERNEL)typedef unsigned int boolean_t;#elsetypedef int boolean_t;#endif#endif /* _MACH_I386_BOOLEAN_H_ */
holdtom
TA貢獻1805條經(jīng)驗 獲得超10個贊
boolean_t t1 = 1;//int type
Boolean t2 = 1; //unsigned char type
BOOL t3 = 4;//YES or NO
bool t4 = 1;//true or false
NSAssert(t1, @"boolean_t t1 is NO");//通過測試
NSAssert(t2, @"boolean_t t2 is NO");//通過測試
NSAssert(t3, @"boolean_t t3 is NO");//通過測試
NSAssert(t4, @"boolean_t t4 is NO");//通過測試
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