iOS 各种布尔值类型讲解

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");//通过测试
NSAssert(t2, @"boolean_t t2 is NO");//通过测试
NSAssert(t3, @"boolean_t t3 is NO");//通过测试
NSAssert(t4, @"boolean_t t4 is NO");//通过测试

Boolean mac os上有历史意义的类型

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;
#else
typedef int             boolean_t;
#endif

#endif  /* _MACH_I386_BOOLEAN_H_ */

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

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