NSAssert和NSParameterAssert

#if !defined(NS_BLOCK_ASSERTIONS)

//NSAssert定义
#if !defined(_NSAssertBody)
#define NSAssert(condition, desc, ...)    
    do {                
    __PRAGMA_PUSH_NO_EXTRA_ARG_WARNINGS 
    if (__builtin_expect(!(condition), 0)) {        
            NSString *__assert_file__ = [NSString stringWithUTF8String:__FILE__]; 
            __assert_file__ = __assert_file__ ? __assert_file__ : @"<Unknown File>"; 
        [[NSAssertionHandler currentHandler] handleFailureInMethod:_cmd 
        object:self file:__assert_file__ 
            lineNumber:__LINE__ description:(desc), ##__VA_ARGS__]; 
    }                
        __PRAGMA_POP_NO_EXTRA_ARG_WARNINGS 
    } while(0)
#endif


//NSCAssert定义
#if !defined(_NSCAssertBody)
#define NSCAssert(condition, desc, ...) 
    do {                
    __PRAGMA_PUSH_NO_EXTRA_ARG_WARNINGS 
    if (__builtin_expect(!(condition), 0)) {        
            NSString *__assert_fn__ = [NSString stringWithUTF8String:__PRETTY_FUNCTION__]; 
            __assert_fn__ = __assert_fn__ ? __assert_fn__ : @"<Unknown Function>"; 
            NSString *__assert_file__ = [NSString stringWithUTF8String:__FILE__]; 
            __assert_file__ = __assert_file__ ? __assert_file__ : @"<Unknown File>"; 
        [[NSAssertionHandler currentHandler] handleFailureInFunction:__assert_fn__ 
        file:__assert_file__ 
            lineNumber:__LINE__ description:(desc), ##__VA_ARGS__]; 
    }                
        __PRAGMA_POP_NO_EXTRA_ARG_WARNINGS 
    } while(0)
#endif

//NSParameterAssert定义
#define NSParameterAssert(condition) NSAssert((condition), @"Invalid parameter not satisfying: %@", @#condition)

//NACParameterAssert定义
#define NSCParameterAssert(condition) NSCAssert((condition), @"Invalid parameter not satisfying: %@", @#condition)

参看链接:https://www.jianshu.com/p/6e444981ab45