如何在 C++ 中动态扩展数组?{就像在向量中} [英] How to expand an array dynamically in C++? {like in vector }

问题描述

可以说，我有

int *p;
p = new int[5];
for(int i=0;i<5;i++)
   *(p+i)=i;

现在我想向数组中添加第 6 个元素.我该怎么做?

Now I want to add a 6th element to the array. How do I do it?

推荐答案

你必须重新分配数组并复制数据:

You have to reallocate the array and copy the data:

int *p;
p = new int[5];
for(int i=0;i<5;i++)
   *(p+i)=i;

// realloc
int* temp = new int[6];
std::copy(p, p + 5, temp); // Suggested by comments from Nick and Bojan
delete [] p;
p = temp;

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