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Comments on Proper location of docstring on struct with attributes

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Proper location of docstring on struct with attributes

+2
−1

When documenting a struct with attributes, where does the docstring go? Before or after the attribute(s)?

Option 1:

/// Does it go here?
#[derive(Deserialize, Debug)]
pub struct Metadata {
    pub version: f32,
    pub contributors: Vec<String>
}

Option 2:

#[derive(Deserialize, Debug)]
/// Does it go here?
pub struct Metadata {
    pub version: f32,
    pub contributors: Vec<String>
}

Option 3 (presumably wrong but adding just in case):

#[derive(Deserialize, Debug)]
pub struct Metadata {
    /// Does it go here? (I assume this would document `version`, 
    /// not the struct)
    pub version: f32,
    pub contributors: Vec<String>
}
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1 comment thread

Unclear (2 comments)
Post
+2
−0

Option 1. The docstring precedes the attributes by convention. Here is an example of the docstring for std::vec::Vec.

However, if using cargo doc to generate documentation, it works just fine if you put it after as well.

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1 comment thread

Convention or enforced? (3 comments)
Convention or enforced?
Iizuki‭ wrote 9 months ago

Is this just a convention, or will it actually break the other way around?

qohelet‭ wrote 9 months ago

I don't know. Good question!

qohelet‭ wrote 9 months ago

I just updated the answer. It works fine both ways in cargo doc