<p>In Python, this code is an example of decorators:</p>
<pre class="lang-python prettyprint-override"><code>@decorator_func
def main_func():
    # Do stuff
</code></pre>
<p>When <code>main_func</code> is called, it will call <code>decorator_func</code> with <code>main_func</code> as the only argument. It will then call the returned function* instead of <code>main_func</code> with the arguments provided.</p>
<p><sup>*A decorator doesn't have to return a function, but that doesn't really matter.</sup></p>
<p>Read <a href="https://www.programiz.com/python-programming/decorator" rel="noreferrer">this</a> for more info on Python decorators.</p>
<p>Anyway, as you can see above, Python uses <code>@</code> and then  the decorator function name before the main function definition. Are there any other syntax options for implementing this? And what are their advantages and disadvantages?</p>

<syntax><decorators>
What are the syntax options for implementing decorators?
<h1>Rust/C# Attributes</h1>
<p>Rust and C# use similar syntax for their &quot;attribute&quot; feature, which is closer in functionality to Java's annotations but is used in the same manner as decorators syntactically.</p>
<p>Rust:</p>
<pre class="lang-rust prettyprint-override"><code>#[test]
fn test_foo() {
    /* ... */
}
</code></pre>
<p>(Rust also allows attributes to be applied to the whole module, using this syntax:)</p>
<pre class="lang-rust prettyprint-override"><code>#![crate_type = &quot;lib&quot;]
</code></pre>
<p>C#:</p>
<pre class="lang-csharp prettyprint-override"><code>[Serializable]
public class SampleClass
{
    // ...
}
</code></pre>

CC BY-SA 4.0
2023-05-19T18:13:39.883Z
2023-05-19T18:13:39.883Z
Ginger
# What are the syntax options for implementing decorators?
Posted by: username_0 on 2023-05-19
In Python, this code is an example of decorators:
@decorator_func
def main_func():
    # Do stuff

When main_func is called, it will call decorator_func with main_func as the only argument. It will then call the returned function* instead of main_func with the arguments provided.
*A decorator doesn't have to return a function, but that doesn't really matter.
Read this for more info on Python decorators.
Anyway, as you can see above, Python uses @ and then  the decorator function name before the main function definition. Are there any other syntax options for implementing this? And what are their advantages and disadvantages?
**Tags:** syntax decorators
---
## 1 answers
### Answer by username_1 on 2023-05-19. Score: 3 | Accepted answer
Rust/C# Attributes
Rust and C# use similar syntax for their "attribute" feature, which is closer in functionality to Java's annotations but is used in the same manner as decorators syntactically.
Rust:
#[test]
fn test_foo() {
    /* ... */
}

(Rust also allows attributes to be applied to the whole module, using this syntax:)
#![crate_type = "lib"]

C#:
[Serializable]
public class SampleClass
{
    // ...
}
---
