内存分配查询

问题描述

当我们动态分配内存时，说100个整数，说

int *x = new int(1000);

那么语句完成后是否会立即分配全部内存?

我的意思是页面错误的概念会在这里出现吗?

When we dynamically allocate the memory say 100 integers say

int *x = new int(1000);

then does entire chunk of memory gets allocated at once after the completion of the statement?

I mean will the the concept of page fault come into picture over here?

推荐答案

sarfaraznawaz写道:

sarfaraznawaz wrote:

当我们动态分配内存时，说100个整数说

When we dynamically allocate the memory say 100 integers say

int *x = new int(1000);

当我们要分配100整数时，应使用正确的语法.
您的代码段只是为1(是，一个)整数分配内存，然后使用值1000初始化.正确的语句(用于分配100整数)是:

When we want to allocate 100 integers, we should use the correct syntax.
Your code snippet just allocates memory for 1 (yes, one) integer and then initializes it with the value 1000. The correct statement (for allocating 100 integers) is:

int * x = new int[100];

成功时，它会(立即)为100整数分配连续的内存，失败时，会抛出异常，如 [ ^ ].

on success, it allocates (at once) contiguous memory for 100 integers, on failure an exception is thrown as specified in documentation of new operator[^].

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