macro_tools 0.85.0

Tools for writing procedural macroses.
Documentation 
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//! A generic `bool` attribute property which consists of only keyword.
//! Defaults to `None`.
//!
//! This property can have two states: `true`, or `false`.
//!
//! # Example
//!
//! ```ignore
//! #[ attribute( some ) ]
//! ```
//!
//! This is useful for attributes that need to enable or disable features or flags.

use core ::marker ::PhantomData;

use crate :: *;
// use component_model_types ::Assign;

/// Default marker for `AttributePropertySingletone`.
/// Used if no marker is defined as parameter.
#[ derive( Debug, Default, Clone, Copy ) ]
pub struct AttributePropertySingletoneMarker;

/// A generic boolean attribute property which consists of only keyword.
/// This property can have two states: `true`, or `false`.
/// Defaults to `false`.
///
/// Unlike other properties, it does not implement parse, because it consists only of keyword which should be parsed outside of the property.
#[ derive( Debug, Default, Clone, Copy ) ]
pub struct AttributePropertySingletone< Marker = AttributePropertySingletoneMarker >(bool, ::core ::marker ::PhantomData< Marker >);

impl< Marker > AttributePropertySingletone< Marker > 
{
  /// Unwraps and returns the internal optional boolean value.
  #[ must_use ]
  #[ inline( always ) ]
  pub fn internal(self) -> bool
  {
  self.0
 }

  /// Returns a reference to the internal optional boolean value.
  #[ must_use ]
  #[ inline( always ) ]
  pub fn ref_internal( &self ) -> &bool
  {
  &self.0
 }
}

impl< Marker, IntoT > Assign< AttributePropertySingletone<Marker >, IntoT> for AttributePropertySingletone< Marker >
where
  IntoT: Into< AttributePropertySingletone<Marker >>,
{
  #[ inline( always ) ]
  fn assign(&mut self, component: IntoT) 
  {
  *self = component.into();
 }
}

impl< Marker > AttributePropertyComponent for AttributePropertySingletone< Marker >
where
  Marker: AttributePropertyComponent,
{
  const KEYWORD: &'static str = Marker ::KEYWORD;
}

impl< Marker > From< bool > for AttributePropertySingletone< Marker > 
{
  #[ inline( always ) ]
  #[ allow( clippy ::default_constructed_unit_structs ) ]
  fn from(src: bool) -> Self 
  {
  Self(src, PhantomData ::default())
 }
}

impl< Marker > From< AttributePropertySingletone<Marker >> for bool 
{
  #[ inline( always ) ]
  fn from(src: AttributePropertySingletone< Marker >) -> Self 
  {
  src.0
 }
}

impl< Marker > core ::ops ::Deref for AttributePropertySingletone< Marker > 
{
  type Target = bool;

  #[ inline( always ) ]
  fn deref( &self ) -> &bool 
  {
  &self.0
 }
}

impl< Marker > AsRef< bool > for AttributePropertySingletone< Marker > 
{
  #[ inline( always ) ]
  fn as_ref( &self ) -> &bool 
  {
  &self.0
 }
}