Struct OptionalBuilder

pub struct OptionalBuilder<RequiredStatus__> { /* private fields */ }

A builder which creates an instance of OptionalBuilt.

Use OptionalBuilder::new() to start the builder. Calling build() consumes the builder, returning the completed item. Before calling build(), you can modify values the builder will use by calling any of the other functions. For this builder, you must call all of the following functions at least once before calling build(), or you will receive a compilation error:

• required(value: i32)

Here is a minimal example:

let instance = OptionalBuilder::new()
    .required(value).build();

An example of how to use this builder is as follows:

let instance = OptionalBuilder::new().required(12).build();
assert_eq!(instance.constructed_from_optional, 0);
let instance = OptionalBuilder::new().required(12).optional(5.0).build();
assert_eq!(instance.constructed_from_optional, 5);
let instance = OptionalBuilder::new().optional(12.0).required(5).build();
assert_eq!(instance.constructed_from_optional, 12);

Implementations

impl OptionalBuilder<Missing>

pub fn new() -> Self

impl<RequiredStatus__> OptionalBuilder<RequiredStatus__>

pub fn optional(self, value: f32) -> Self

pub fn required(self, value: i32) -> OptionalBuilder<Present>

impl OptionalBuilder<Present>

pub fn build(self) -> OptionalBuilt