Struct CowIdentifier 

pub struct CowIdentifier<'a>(/* private fields */);

A copy-on-write identifier that borrows static strings without allocation.

Use this when identifiers are often string literals but occasionally need to be dynamically generated.

Examples

use prax_query::builder::CowIdentifier;

// Static string - zero allocation
let id = CowIdentifier::borrowed("user_id");

// Dynamic string - allocates if not static
let dynamic_name = format!("col_{}", 1);
let id = CowIdentifier::owned(dynamic_name);

Implementations

impl<'a> CowIdentifier<'a>

pub const fn borrowed(s: &'a str) -> Self

Create from a borrowed static string (zero allocation).

pub fn owned(s: String) -> Self

Create from an owned string.

pub fn new(s: impl Into<Cow<'a, str>>) -> Self

Create from any string-like type.

pub fn as_str(&self) -> &str

Get as string slice.

pub fn is_borrowed(&self) -> bool

Check if this is a borrowed (non-allocating) reference.

pub fn into_owned(self) -> String

Convert to owned, cloning if necessary.

Trait Implementations

impl<'a> AsRef<str> for CowIdentifier<'a>

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl<'a> Clone for CowIdentifier<'a>

fn clone(&self) -> CowIdentifier<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for CowIdentifier<'a>

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

Formats the value using the given formatter.

impl<'a> Default for CowIdentifier<'a>

fn default() -> Self

Returns the “default value” for a type.

impl<'a> Display for CowIdentifier<'a>

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

Formats the value using the given formatter.

impl<'a> From<&'a str> for CowIdentifier<'a>

fn from(s: &'a str) -> Self

Converts to this type from the input type.

impl From<String> for CowIdentifier<'static>

fn from(s: String) -> Self

Converts to this type from the input type.

impl<'a> Hash for CowIdentifier<'a>

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<'a> PartialEq for CowIdentifier<'a>

fn eq(&self, other: &CowIdentifier<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

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

impl<'a> Eq for CowIdentifier<'a>

impl<'a> StructuralPartialEq for CowIdentifier<'a>