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// Copyright ©2015 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// TODO(kortschak): Generate this file from shadow.go when all complex type are available.
package mat
import "gonum.org/v1/gonum/blas/cblas128"
// checkOverlapComplex returns false if the receiver does not overlap data elements
// referenced by the parameter and panics otherwise.
//
// checkOverlapComplex methods return a boolean to allow the check call to be added to a
// boolean expression, making use of short-circuit operators.
func checkOverlapComplex(a, b cblas128.General) bool {
if cap(a.Data) == 0 || cap(b.Data) == 0 {
return false
}
off := offsetComplex(a.Data[:1], b.Data[:1])
if off == 0 {
// At least one element overlaps.
if a.Cols == b.Cols && a.Rows == b.Rows && a.Stride == b.Stride {
panic(regionIdentity)
}
panic(regionOverlap)
}
if off > 0 && len(a.Data) <= off {
// We know a is completely before b.
return false
}
if off < 0 && len(b.Data) <= -off {
// We know a is completely after b.
return false
}
if a.Stride != b.Stride && a.Stride != 1 && b.Stride != 1 {
// Too hard, so assume the worst; if either stride
// is one it will be caught in rectanglesOverlap.
panic(mismatchedStrides)
}
if off < 0 {
off = -off
a.Cols, b.Cols = b.Cols, a.Cols
}
if rectanglesOverlap(off, a.Cols, b.Cols, min(a.Stride, b.Stride)) {
panic(regionOverlap)
}
return false
}
func (m *CDense) checkOverlap(a cblas128.General) bool {
return checkOverlapComplex(m.RawCMatrix(), a)
}
func (m *CDense) checkOverlapMatrix(a CMatrix) bool {
if m == a {
return false
}
var amat cblas128.General
switch ar := a.(type) {
default:
return false
case RawCMatrixer:
amat = ar.RawCMatrix()
}
return m.checkOverlap(amat)
}
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