Struct SynapseStore 

pub struct SynapseStore {
    pub row_ptr: Vec<u32>,
    pub synapses: Vec<Synapse>,
}

Compressed Sparse Row synapse storage.

All outgoing synapses for neuron i are at indices row_ptr[i]..row_ptr[i+1] in the synapses array. This gives cache-friendly iteration during spike propagation — all targets of a spiking neuron are contiguous in memory.

Fields

row_ptr: Vec<u32>

Index into synapses for each neuron. Length = n_neurons + 1. row_ptr[i] = start index, row_ptr[i+1] = end index (exclusive).

synapses: Vec<Synapse>

All synapses, grouped contiguously by source neuron.

Implementations

impl SynapseStore

pub fn empty(n_neurons: u32) -> Self

Create empty store for n neurons (no connections).

pub fn from_edges(n_neurons: u32, edges: Vec<(u32, Synapse)>) -> Self

Build CSR from a list of (source_neuron, Synapse) pairs.

The pairs do NOT need to be sorted — this function sorts them internally.

pub fn outgoing(&self, neuron: u32) -> &[Synapse]

Get outgoing synapses for a given source neuron.

pub fn outgoing_mut(&mut self, neuron: u32) -> &mut [Synapse]

Get mutable outgoing synapses for a given source neuron.

pub fn total_synapses(&self) -> usize

Total number of synapses across all neurons.

pub fn n_neurons(&self) -> u32

Number of neurons this store covers.

pub fn prune_dead(&mut self) -> usize

Remove dead synapses (maturity == 0x00) and rebuild CSR. Returns count of pruned synapses.

pub fn add_synapse(&mut self, source: u32, syn: Synapse)

Add a synapse from source to the given target. Rebuilds the CSR row. This is expensive — batch additions and rebuild when possible.

pub fn extend(&mut self, count: usize)

Extend the store to accommodate additional neurons (with no synapses).

Used when dynamically spawning neurons from templates.