Struct dynamodb_expression::update::set::math::Math

pub struct Math { /* private fields */ }

Represents a DynamoDB math operation used as a part of an update expression.

See also: Update

Examples

use dynamodb_expression::{path::{Name, Path}, update::Math};

let math = Math::builder(Name::from("foo")).add(4);
assert_eq!("foo = foo + 4", math.to_string());

let math_2 = Path::from(Name::from("foo")).math().add(4);
assert_eq!(math, math_2);

let math = Math::builder(Name::from("foo")).src(Name::from("bar")).sub(7);
assert_eq!("foo = bar - 7", math.to_string());

let math_2 = Path::from(Name::from("foo")).math().src(Name::from("bar")).sub(7);
assert_eq!(math, math_2);

Implementations

impl Math

A math operation to modify a field and assign the updated value to another (possibly different) field.

pub fn builder<T>(dst: T) -> Builderwhere T: Into<Path>,

Trait Implementations

impl Clone for Math

fn clone(&self) -> Math

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Math

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

Formats the value using the given formatter.

impl Display for Math

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

Formats the value using the given formatter.

impl From<Math> for SetAction

fn from(math: Math) -> Self

Converts to this type from the input type.

impl From<Math> for Update

fn from(value: Math) -> Self

Converts to this type from the input type.

impl Hash for Math

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Math

fn eq(&self, other: &Math) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Math

impl StructuralEq for Math

impl StructuralPartialEq for Math