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使用 ptr.* 解引用

通过指针读取和写入数据。

使用 ptr.* 解引用 是 CoddyKit 上的免费 Zig Academy 课时。这是第 2 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。

Reaching the Value

A pointer holds an address, not a value. To use the value behind it you must dereference the pointer first.

The .* Syntax

Zig dereferences with a trailing .* on the pointer. So ptr.* means the value that ptr currently points to.

var x: i32 = 7;
const p = &x;
const v = p.*;

Read Through a Pointer

Writing ptr.* in an expression reads the pointed-to value, giving you a normal copy you can use anywhere.

const doubled = p.* * 2;

Write Through a Pointer

Put ptr.* on the left of an assignment to write a new value into the original location.

p.* = 99;

Changes Are Visible

Because the pointer shares the original storage, writing through it updates the variable everyone else sees too.

var x: i32 = 1;
const p = &x;
p.* = 5;
// x is now 5

No Arrow Operator

Zig has no -> like C. Whether you read or write a field, you always go through the same .* dereference.

Dereference Then Field

For a pointer to a struct, p.field works directly: Zig auto-dereferences for field access, so you skip the .* there.

const p = &point;
const y = p.y;

Explicit Is Allowed

You may still spell it out as p.*.field, but the shorter p.field is idiomatic Zig and reads more cleanly.

Const Blocks Writes

If the pointer is a *const T, then ptr.* is read-only; trying to assign through it is a compile error.

const x: i32 = 3;
const p = &x;
// p.* = 4; // error

Dereference in Math

You can use ptr.* anywhere a value fits, including arithmetic, so p.* + 1 just means the pointee plus one.

const next = p.* + 1;

A Common Mistake

Forgetting .* tries to use the address as a number, which is a type error. Zig catches it at compile time, not at runtime.

Quick Check

You have const p = &x and want to store a new number into x through p. What do you write?

Recap

Use ptr.* to read or write the value a pointer targets, struct fields auto-dereference, and *const T pointers stay read-only. 🎯

常见问题解答

「使用 ptr.* 解引用」课时是免费的吗？

是的 — 「使用 ptr.* 解引用」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。

「使用 ptr.* 解引用」这节课中我会学到什么？

通过指针读取和写入数据。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 2 节课，共 4 节。

「使用 ptr.* 解引用」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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