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Make assignment constexpr

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This commit is contained in:
Tyler Veness
2025-02-21 18:16:46 +00:00
committed by Rasmus Munk Larsen
parent 4dda5b927a
commit 0ae7b59018
5 changed files with 81 additions and 44 deletions
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19
test/constexpr.cpp
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@@ -10,6 +10,13 @@
#define EIGEN_TESTING_CONSTEXPR
#include "main.h"
template <typename Scalar, int Rows>
struct ConstexprTest {
constexpr ConstexprTest(const Matrix<Scalar, Rows, Rows>& B) { A = B; }
Matrix<Scalar, Rows, Rows> A;
};
EIGEN_DECLARE_TEST(constexpr) {
// Clang accepts (some of) this code when using C++14/C++17, but GCC does not like
// the fact that `T array[Size]` inside Eigen::internal::plain_array is not initialized
@@ -33,6 +40,18 @@ EIGEN_DECLARE_TEST(constexpr) {
VERIFY_IS_EQUAL(vec.size(), 3);
static_assert(vec.coeff(0, 1) == 2);
// Check assignment. A wrapper struct is used to avoid copy ellision.
constexpr ConstexprTest obj1(Matrix2d({{1, 2}, {3, 4}}));
VERIFY_IS_EQUAL(obj1.A.size(), 4);
static_assert(obj1.A(0, 0) == 1);
static_assert(obj1.A(0) == 1);
static_assert(obj1.A.coeff(0, 1) == 2);
constexpr ConstexprTest obj2(Matrix3d({{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}));
VERIFY_IS_EQUAL(obj2.A.size(), 9);
static_assert(obj2.A(0, 0) == 1);
static_assert(obj2.A(0) == 1);
static_assert(obj2.A.coeff(0, 1) == 2);
// Also check dynamic size arrays/matrices with fixed-size storage (currently
// only works if all elements are initialized, since otherwise the compiler
// complains about uninitialized trailing elements.