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