1. sizeof操作符的结果类型是size_t,它在头文件中typedef为unsigned int类型。该类型保证能容纳实现所建立的最大对象的字节大小。 2. sizeof是算符,strlen是函数。 3. sizeof可以用类型做参数,strlen只能用char*做参数,且必须是以''\0''结尾的。 4. 数组做sizeof的参数不退化,传递给strlen就退化为指针了。
int main(void) { //int array[]; // error: storage size of 'error' isn't known int array[5]; // //int *p = &array; // error: cannot convert 'int (*)[5]' to 'int*' in initialization void * p = &array; //0x72fe10 int * p1 = &array[0]; //0x72fe10 int * p2 ...
1== sizeof(char) <= sizeof(short) <= sizeof(int) <= sizeof(long) <= sizeof(longlong) 由于历史原因,整型的位宽有多种标准: 为解决这一问题,C99/C++11引入了定宽整数类型。 定宽整数类型 定宽整数类型本质上是普通整数类型的类型别名。 <cstdint>提供了若干定宽整数的类型和各定宽整数类型最大值...
When used withnew[]-expression, the size of an array may be zero; such an array has no elements: int*p=newint[0];// accessing p[0] or *p is undefineddelete[]p;// cleanup still required Assignment Objects of array type cannot be modified as a whole: even though they arelvalues(e...
("大小:", global_metadata_size); var file = new File("/data/data/" + get_self_process_name() + "/global-metadata.dat", "wb"); file.write(Memory.readByteArray(address, global_metadata_size)); file.flush(); file.close(); console.log('导出完毕...'); }, onComplete: function (...
Troubleshoot operating system service issues - Training This module discusses the role of operating system services and how to troubleshoot issues that restrict functionality. This module also discusses resolving issues with signing in to Windows....
The attacker controls the variable x to load the code pointer fptr out the bound of array1. Its calculation result is used as the index of array2. Reading data from array2 will change the cache status which will leak the value of the code pointer. Speculative execution attack [1] leaks...
total += things[i].CalculateSize(); returntotal; } 这样看起来似乎足够安全了,但是让我们仔细观察C#编译器生成的中间语言(IL)的部分代码: ? // This is the start of the for loop // Load the array IL_0009: ldarg.0 // Load the current index ...
When applied to an expression,sizeofdoesnot evaluate the expression(i.e. the expression is an unevaluated operand)(since C++11), and even if the expression designates a polymorphic object, the result is the size of the static type of the expression. Lvalue-to-rvalue, array-to-pointer, or...
auto.cpp:30:19: error: 'auto_arr2' declared as array of 'auto' auto auto_arr2[10] = arr; decltype decltype 关键字是为了解决 auto 关键字只能对变量进行类型推导的缺陷而出现的。它的用法和 sizeof 很相似: decltype(表达式) 有时候,我们可能需要计算某个表达式的类型,例如: auto ...