hexga_generational 0.0.11-beta.49

GenVec, ideal for MAS (Multi-Agent System), where each agent can be removed at any time and has references to other agents.
Documentation 
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use super::*;

pub mod prelude
{
    pub use super::GenID;
    pub(crate) use super::{GenIDOf, Generation, IGeneration};
}

pub trait IGeneration:
    Eq
    + Hash
    + Ord
    + Increment
    + Decrement
    + OverflowBehavior
    + Debug
    + MaxValue
    + MinValue
    + Copy
    + 'static
{
}
impl<T> IGeneration for T where
    T: Eq
        + Hash
        + Ord
        + Increment
        + Decrement
        + OverflowBehavior
        + Debug
        + MaxValue
        + MinValue
        + Copy
        + 'static
{
}

// Todo: Make a flag for the generation
pub type Generation = u32;
pub type GenID = GenIDOf<Generation>;

#[derive(Clone, Copy, PartialEq, Eq, Hash, Ord, PartialOrd)]
pub struct GenIDOf<Gen: IGeneration = Generation>
{
    index: usize,
    generation: Gen,
}

impl<Gen: IGeneration> Default for GenIDOf<Gen>
{
    fn default() -> Self { Self::NULL }
}

#[cfg(feature = "serde")]
impl<Gen: IGeneration> Serialize for GenIDOf<Gen>
where
    Gen: Serialize,
{
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        if self.index.is_max()
        {
            None
        }
        else
        {
            Some((self.index, self.generation))
        }
        .serialize(serializer)
    }
}

#[cfg(feature = "serde")]
impl<'de, Gen: IGeneration> Deserialize<'de> for GenIDOf<Gen>
where
    Gen: Deserialize<'de>,
{
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        match Option::deserialize(deserializer)?
        {
            Some((index, generation)) => Ok(Self::from_index_and_generation(index, generation)),
            None => Ok(Self::from_index_and_generation(usize::MAX, Gen::MIN)),
        }
    }
}
impl<Gen: IGeneration> Debug for GenIDOf<Gen>
{
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
    {
        if self.is_null()
        {
            write!(f, "NULL")
        }
        else
        {
            f.debug_tuple("")
                .field(&self.index)
                .field(&GenerationDebug(self.generation))
                .finish()
        }
    }
}

pub(crate) struct GenerationDebug<T>(pub(crate) T);
impl<T> Debug for GenerationDebug<T>
where
    T: Debug,
{
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { write!(f, "#{:?}", self.0) }
}

// Todo: add GetManyMut ?
//pub trait CollectionWithGenVecID<T,Gen:IGeneration> : Get<GenIDOf<Gen>,Output=T> + GetMut<GenIDOf<Gen>,Output=T> + Remove<GenIDOf<Gen>,Output = T> {}
//impl<T,Gen:IGeneration,S> CollectionWithGenVecID<T,Gen> for S where S: Get<GenIDOf<Gen>,Output=T> + GetMut<GenIDOf<Gen>,Output=T> + Remove<GenIDOf<Gen>,Output = T> {}

impl<Gen: IGeneration> GenIDOf<Gen>
{
    pub const fn from_index_and_generation(index: usize, generation: Gen) -> Self
    {
        Self { index, generation }
    }

    pub const fn index(self) -> usize { self.index }
    pub const fn generation(self) -> Gen { self.generation }

    pub fn is_null(self) -> bool { self == Self::NULL }
    pub fn is_not_null(self) -> bool { self != Self::NULL }

    /// Set the value to `Self::NULL`
    pub fn reset(&mut self) { *self = Self::NULL; }

    pub const NULL: Self = GenIDOf {
        index: usize::MAX,
        generation: Gen::MIN,
    };
}
impl<Gen: IGeneration, C> IndexExtension<C> for GenIDOf<Gen> {}

impl<Gen: IGeneration> From<(usize, Gen)> for GenIDOf<Gen>
{
    fn from((index, generation): (usize, Gen)) -> Self
    {
        Self::from_index_and_generation(index, generation)
    }
}
impl<Gen: IGeneration> Into<(usize, Gen)> for GenIDOf<Gen>
{
    fn into(self) -> (usize, Gen) { (self.index, self.generation) }
}