C++ 字符数组的动态内存分配
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Dynamic memory allocation for character arrays
提问by devjeetroy
Okay, so I was trying to resize an array as follows :
好的，所以我试图按如下方式调整数组大小：
if((editBufferCounter + 20) > editBufferSize)
{
char* temp;
temp = new char[editBufferSize + 5];
strcpy(temp, editBuffer);
delete[] editBuffer;
editBufferSize *= 2;
editBuffer = new char[editBufferSize];
strcpy(editBuffer, temp);
delete[] temp;
}
The last line delete[] tempcauses a memory problem. The program simply crashes. I can't seem to get what the problem here is.
最后一行delete[] temp导致内存问题。该程序只是崩溃。我似乎不明白这里的问题是什么。
Note:
The program runs fine if i remove the line delete[] temp;
注意：如果我删除该行，程序运行良好 delete[] temp;
回答by arnkore
Do your editBuffer have a terminating NUL character? if not, please replace strcpywith strncpy.
您的 editBuffer 是否有终止 NUL 字符？如果不是，请替换strcpy为strncpy。
回答by Blastfurnace
You function can be simplified to:
您的功能可以简化为：
if ((editBufferCounter + 20) > editBufferSize)
{
char* temp = new char[editBufferSize * 2];
std::copy_n(editBuffer, editBufferSize, temp);
delete[] editBuffer;
editBufferSize *= 2;
editBuffer = temp;
}
