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use lapack::c;
use error::*;
use layout::MatrixLayout;
use types::*;
use super::{Transpose, into_result};
pub type Pivot = Vec<i32>;
pub trait Solve_: Sized {
fn lu(MatrixLayout, a: &mut [Self]) -> Result<Pivot>;
fn inv(MatrixLayout, a: &mut [Self], &Pivot) -> Result<()>;
fn solve(MatrixLayout, Transpose, a: &[Self], &Pivot, b: &mut [Self]) -> Result<()>;
}
macro_rules! impl_solve {
($scalar:ty, $getrf:path, $getri:path, $getrs:path) => {
impl Solve_ for $scalar {
fn lu(l: MatrixLayout, a: &mut [Self]) -> Result<Pivot> {
let (row, col) = l.size();
let k = ::std::cmp::min(row, col);
let mut ipiv = vec![0; k as usize];
let info = $getrf(l.lapacke_layout(), row, col, a, l.lda(), &mut ipiv);
into_result(info, ipiv)
}
fn inv(l: MatrixLayout, a: &mut [Self], ipiv: &Pivot) -> Result<()> {
let (n, _) = l.size();
let info = $getri(l.lapacke_layout(), n, a, l.lda(), ipiv);
into_result(info, ())
}
fn solve(l: MatrixLayout, t: Transpose, a: &[Self], ipiv: &Pivot, b: &mut [Self]) -> Result<()> {
let (n, _) = l.size();
let nrhs = 1;
let ldb = 1;
let info = $getrs(l.lapacke_layout(), t as u8, n, nrhs, a, l.lda(), ipiv, b, ldb);
into_result(info, ())
}
}
}}
impl_solve!(f64, c::dgetrf, c::dgetri, c::dgetrs);
impl_solve!(f32, c::sgetrf, c::sgetri, c::sgetrs);
impl_solve!(c64, c::zgetrf, c::zgetri, c::zgetrs);
impl_solve!(c32, c::cgetrf, c::cgetri, c::cgetrs);