calculator_backend

Struct History

pub struct History {
    pub entries: Vec<HistoryEntry>,
    pub last_result: Option<f64>,
}

Expand description

Represents the history of calculations performed by the calculator.

§Fields

entries: A vector of HistoryEntry structs, each representing a single calculation.
last_result: An optional floating-point number (Option<f64>) representing the result of the most recent successful calculation.

§Methods

§`new`

Creates a new, empty History instance.

§`add_entry`

Adds a new entry to the history.

§Arguments

input: A string representing the mathematical expression provided by the user.
result: An optional floating-point number representing the result of the calculation. Use None if the calculation failed.
error_message: An optional string containing an error message if the calculation failed. Use None if there was no error.

§`get_history`

Returns a reference to the vector of HistoryEntry structs.

§`get_last_result`

Returns the result of the most recent successful calculation, or None if no successful calculation has been performed.

Fields§

§entries: Vec<HistoryEntry>§last_result: Option<f64>

Implementations§

impl History

Represents the history of calculations performed by the calculator.

§Fields

entries: A vector of HistoryEntry structs, each representing a single calculation.
last_result: An optional floating-point number (Option<f64>) representing the result of the most recent successful calculation.

§Methods

§`new`

Creates a new, empty History instance.

§`add_entry`

Adds a new entry to the history.

§Arguments

input: A string representing the mathematical expression provided by the user.
result: An optional floating-point number representing the result of the calculation. Use None if the calculation failed.
error_message: An optional string containing an error message if the calculation failed. Use None if there was no error.

§`get_history`

Returns a reference to the vector of HistoryEntry structs.

§`get_last_result`

Returns the result of the most recent successful calculation, or None if no successful calculation has been performed.

pub fn new() -> Self

pub fn add_entry( &mut self, input: String, result: Option<f64>, error_message: Option<String>, )

pub fn get_history(&self) -> &Vec<HistoryEntry>

pub fn get_last_result(&self) -> Option<f64>

Trait Implementations§

impl Debug for History

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

impl Freeze for History

impl RefUnwindSafe for History

impl Send for History

impl Sync for History

impl Unpin for History

impl UnwindSafe for History

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.