kryst 3.2.1

Krylov subspace and preconditioned iterative solvers for dense and sparse linear systems, with shared and distributed memory parallelism.
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use crate::context::pc_context::PcConfig;
use crate::context::pc_context::NoOpPreconditioner;
use crate::error::KError;
use crate::preconditioner::Preconditioner;

pub fn try_build(cfg: &PcConfig) -> Result<Option<Box<dyn Preconditioner>>, KError> {
    match cfg {
        PcConfig::None => Ok(Some(Box::new(NoOpPreconditioner))),
        _ => Ok(None),
    }
}