iOS中的NSValue

struct student{
    char name[20];
    char gender;
};
typedef struct student Student;
int main(int argc, const char * argv[]) {
    @autoreleasepool {
       
    //NSValue 数值类,将指针,结构体等转换成对象
        int a = 10;
        int *p = &a;
        NSMutableArray *array = [NSMutableArray arrayWithCapacity:1];
        NSValue *value = [NSValue valueWithPointer:p];
        [array addObject:value];
        
        //void *是泛型
       int *newP = [value pointerValue];
        
    
        NSLog(@"%d",*newP);
        //NSRange
        
        NSRange range = {14,35};
        //NSRange range1 = NSMakeRange(3, 5);
       // [array addObject:range1];
        //[array addObject:range];
        //将NSRange 结构体转换为NSValue
        NSValue *rangeValue = [NSValue valueWithRange:range];
        
        [array addObject:rangeValue];
        //将NSRange 转换成NSRange
        NSRange newRange = {0};
        newRange = [rangeValue rangeValue];
        NSLog(@"%lu,%lu",newRange.location,newRange.length);
    
        
        Student stu =  {"laowang",'m'};
    
    
    //自定义结构体转换成NSVlaue对象
        NSValue *stuValue = [NSValue valueWithBytes:&stu objCType:@encode(Student)];
        //NSValue 对象 转换成结构体
        Student newStu = {0};
        [stuValue getValue:&newStu];
        NSLog(@"%s,%c",newStu.name,newStu.gender);