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use core::{BoundedSpace, Space, Card};
use std::fmt;
#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
pub struct Naturals;
impl Space for Naturals {
type Value = u64;
fn dim(&self) -> usize { 1 }
fn card(&self) -> Card { Card::Infinite }
}
impl BoundedSpace for Naturals {
type BoundValue = Self::Value;
fn inf(&self) -> Option<u64> { Some(1) }
fn sup(&self) -> Option<u64> { None }
fn contains(&self, val: Self::BoundValue) -> bool { val > 0 }
}
impl fmt::Display for Naturals {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "\u{2115}")
}
}