feat(linear-static-3d-euler-beam): step 9 - dense-math-adapters-review-fix

src/fesa/math/matrix.cpp

@@ -9,6 +9,15 @@
 namespace fesa {
 namespace {
 
+std::size_t checkedStorageSize(const std::size_t rows, const std::size_t columns) {
+    // Reject shape multiplication overflow before logical dimensions and storage diverge.
+    if (columns != 0 &&
+        rows > (std::numeric_limits<std::size_t>::max)() / columns) {
+        throw std::length_error{"Dense matrix dimensions exceed the storage size range."};
+    }
+    return rows * columns;
+}
+
 MKL_INT toMklSize(const std::size_t size) {
     if (size > static_cast<std::size_t>((std::numeric_limits<MKL_INT>::max)())) {
         throw std::length_error{"Dense matrix dimension exceeds the MKL integer range."};
@@ -30,7 +39,7 @@ Matrix::Matrix(
     const std::size_t rows,
     const std::size_t columns,
     const double value)
-    : rows_(rows), columns_(columns), values_(rows * columns, value) {}
+    : rows_(rows), columns_(columns), values_(checkedStorageSize(rows, columns), value) {}
 
 Matrix::Matrix(const Matrix& other)
     : rows_(other.rows_), columns_(other.columns_), values_(other.values_.size()) {