Builder Patterns

Rust Programming Best Practices

impl RequestBuilder {
    pub fn new() -> Self {...}
    pub fn url(mut Self, url: &str) -> Self {...}
    pub fn method(mut Self, method: Method) -> Self {...}
    pub fn body(mut Self, body: &str) -> Self {...}
    ...
    pub fn build(self) -> Request {...}
}

impl Request {
    // personal preference 
    // (allow caller to not have to import ...Builder type)
    pub fn builder() -> RequestBuilder { RequestBuilder::new() }
}

pub struct NoUrl;
pub struct Url(String);

pub struct RequestBuilder<U> {...}

impl<U> RequestBuilder<U> {...}

impl RequestBuilder<NoUrl> {
	pub fn new() -> Self {...}    
}

impl RequestBuilder<Url> {
	pub fn build(self) -> Result<Request> {...}
}

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Builder Patterns

Rust Programming Best Practices