Enum SquarePlanarPermutation 

pub enum SquarePlanarPermutation {
    SP1,
    SP2,
    SP3,
}

A @SP1/@SP2/@SP3 square-planar stereo tag (OpenSMILES’s extended chirality-class syntax, e.g. Pt(II)/Pd(II) complexes like cisplatin).

Each variant names which pair of the 4 explicit neighbor positions (0-indexed, in the order recorded by crate::Molecule::stereo_neighbor_order) sit trans (~180°) to each other:

• SP1: positions (0,2) trans, (1,3) trans
• SP2: positions (0,1) trans, (2,3) trans
• SP3: positions (0,3) trans, (1,2) trans

Oracle-verified against RDKit 2026.03.3 (3D embedding bond angles, cross-checked against RDKit’s own documented cisplatin/transplatin example) — see docs/rfcs/square_planar_stereo_rfc.md.

Variants

SP1

SP2

SP3

Implementations

impl SquarePlanarPermutation

pub fn trans_pairs(self) -> [(u8, u8); 2]

The two trans-pairs this permutation implies, as 0-indexed neighbor positions.

Trait Implementations

impl Clone for SquarePlanarPermutation

fn clone(&self) -> SquarePlanarPermutation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SquarePlanarPermutation

impl Debug for SquarePlanarPermutation

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

Formats the value using the given formatter.

impl Eq for SquarePlanarPermutation

impl Hash for SquarePlanarPermutation

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 SquarePlanarPermutation

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SquarePlanarPermutation