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Fix dangling reference in IndexedView with expression indices

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libeigen/eigen!2335

Closes #1943
This commit is contained in:
Pavel Guzenfeld
2026-03-29 16:39:13 +00:00
committed by Rasmus Munk Larsen
parent 624ab58e8d
commit b7f6aed1b9
2 changed files with 74 additions and 0 deletions
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56
test/indexed_view.cpp
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@@ -840,6 +840,61 @@ void check_tutorial_examples() {
}
}
// Regression test for bug #1943: IndexedView with temporary expression indices.
void check_expression_indices() {
MatrixXd m(3, 4);
m << 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12;
// Reshaped temporary as column index (was segfault before fix).
{
auto view = m(all, Array<int, 1, 1>{0}.reshaped());
VectorXd result = view;
VERIFY_IS_APPROX(result, m.col(0));
}
// Block expression as index.
{
ArrayXi idx(3);
idx << 0, 1, 2;
auto view = m(all, idx.head(2));
MatrixXd result = view;
VERIFY_IS_APPROX(result, m.leftCols(2));
}
// CwiseBinaryOp expression as index.
{
Array<int, 2, 1> base;
base << 0, 1;
auto view = m(all, base + 0);
MatrixXd result = view;
VERIFY_IS_APPROX(result, m.leftCols(2));
}
// Reverse expression as index.
{
Array<int, 3, 1> idx;
idx << 2, 1, 0;
auto view = m(all, idx.reverse());
MatrixXd result = view;
MatrixXd expected(3, 3);
expected << m.col(0), m.col(1), m.col(2);
VERIFY_IS_APPROX(result, expected);
}
// 1D vector indexed view (VectorIndexedViewSelector path).
{
VectorXd v(5);
v << 10, 20, 30, 40, 50;
ArrayXi idx(3);
idx << 4, 2, 0;
auto view = v(idx.reverse());
VectorXd result = view;
VectorXd expected(3);
expected << 10, 30, 50;
VERIFY_IS_APPROX(result, expected);
}
}
void check_aliasing() {
Eigen::Vector<float, 5> z = {0.0f, 1.1f, 2.2f, 3.3f, 4.4f};
std::vector<int> left_indices = {0, 1, 3, 4};
@@ -854,6 +909,7 @@ EIGEN_DECLARE_TEST(indexed_view) {
CALL_SUBTEST_1(check_indexed_view());
}
CALL_SUBTEST_1(check_tutorial_examples());
CALL_SUBTEST_1(check_expression_indices());
CALL_SUBTEST_1(check_aliasing());
// static checks of some internals: