pipecircuit 0.0.5

Correct. Robust. Fast. Portable.
Documentation 
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use super::{WarpTable, WarpTableInsertWithIdOutcome, WarpTableRow};

#[derive(Debug, Eq, PartialEq)]
#[must_use]
pub enum WarpTableUpsertOutcome<Id, Row> {
    Inserted { id: Id, row: usize },
    Replaced { id: Id, row: usize, previous: Row },
    Full { id: Id, rejected: Row },
}

impl<Row: WarpTableRow, Brand> WarpTable<Row, Brand> {
    /// Inserts an absent caller-supplied ID or replaces its existing row.
    pub fn upsert(&mut self, id: Row::Id, row: Row) -> WarpTableUpsertOutcome<Row::Id, Row> {
        match self.insert_with_id(id, row) {
            WarpTableInsertWithIdOutcome::Inserted { id, row } => {
                WarpTableUpsertOutcome::Inserted { id, row }
            }
            WarpTableInsertWithIdOutcome::AlreadyPresent {
                id,
                existing_row,
                rejected: replacement,
            } => WarpTableUpsertOutcome::Replaced {
                id,
                row: existing_row,
                previous: self.replace_at(id, existing_row, replacement),
            },
            WarpTableInsertWithIdOutcome::Full { id, rejected } => {
                WarpTableUpsertOutcome::Full { id, rejected }
            }
        }
    }
}