如何复制在C载体？ [英] How to replicate vector in c?

问题描述

在C以前的日子++和矢量/列表，当他们需要存储更多的数据他们是如何扩大数组的大小？

In the days before c++ and vector/lists, how did they expand the size of arrays when they needed to store more data?

推荐答案

典型的C code是这样的：

Typical C code looks like this:

void* newMem = realloc(oldMem, newSize);
if(!newMem)
{
    // handle error
}

oldMem = newMem;

请注意，如果realloc的失败则返回零，但旧内存仍然有效，这个典型的使用会导致内存泄漏：

Note that if realloc fails then it returns zero but the old memory is still valid, this typical usage causes memory leak:

oldMem = realloc(oldMem, newSize);
if(!oldMem)
{
    // handle error
}

不幸的是这是非常常见的;

Unfortunately it is very common;

另外请注意，没有什么特别的C ++矢量/列表。类似的结构可以用C实现的，只是语法（和错误处理）看起来不同。例如看性病载体:: LodePNG的模拟对C

Also note that there is nothing special about C++ vector/list. Similar structures can be implemented in C, just the syntax (and error handling) look different. For example see LodePNG's analog of std::vector for C.

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