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测试分配器捕获内存泄漏

自动检测内存错误。

测试分配器捕获内存泄漏 是 CoddyKit 上的免费 Zig Academy 课时。这是第 3 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Zig Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Zig Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Memory Bugs Are Sneaky

A program can pass every value check yet still leak memory by forgetting to free it. Zig gives tests a tool to catch exactly that.

Meet testing.allocator

Inside a test you get a special allocator at std.testing.allocator. Use it anywhere your code needs to allocate heap memory.

const a = std.testing.allocator;

It Tracks Every Allocation

The testing.allocator remembers every block it hands out. When the test ends it checks whether each one was given back.

A Leak Fails the Test

If even one allocation is never freed, the testing.allocator reports a leak and the test fails, pointing you at the missing free.

Allocate in a Test

Ask the allocator for memory just like in real code. Here alloc reserves a buffer of ten bytes that you must release later.

const buf = try a.alloc(u8, 10);

Free with defer

Pair each allocation with a defer that frees it. The cleanup is scheduled immediately, so it runs even if the test fails partway.

const buf = try a.alloc(u8, 10);
defer a.free(buf);

Forget free, Catch the Bug

Drop that defer and the test fails with a leak report. This is how the allocator turns a silent bug into a loud, fixable failure.

It Also Spots Double-Frees

The same checked allocator catches freeing the same block twice or freeing memory it never gave you, which are classic crashes.

Pass It Into Your Code

Functions that allocate take an allocator parameter. In a test, hand them testing.allocator so their memory is tracked too.

const list = try buildList(std.testing.allocator);

Clean Up What You Build

Whatever your function allocated, the test must release. Add a defer right after the call to free or deinit the returned data.

defer list.deinit();

Free Memory Testing

Because leaks fail the build, every passing test proves its memory was balanced. That confidence is unique to testing.allocator.

Quick Check

You run a test that allocates with std.testing.allocator but never frees the buffer. What happens?

Recap

You used std.testing.allocator to catch leaks and double-frees for free. Pair each alloc with a defer free and your tests stay clean. ✅

常见问题解答

「测试分配器捕获内存泄漏」课时是免费的吗？

是的 — 「测试分配器捕获内存泄漏」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Zig Academy 课程的其余内容，请升级到 CoddyKit PRO。 Zig Academy 课程共包含 4 节课。

「测试分配器捕获内存泄漏」这节课中我会学到什么？

自动检测内存错误。你通过在浏览器中直接运行的动手代码来练习 Zig Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Zig Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Zig Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 3 节课，共 4 节。

「测试分配器捕获内存泄漏」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Zig Academy 课中编写并运行代码吗？

能。每节 Zig Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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