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Selectively add constexpr to Core expression template scaffolding

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libeigen/eigen!2184

Closes #3041

Co-authored-by: Rasmus Munk Larsen <rmlarsen@gmail.com>
This commit is contained in:
Rasmus Munk Larsen
2026-02-24 19:59:10 -08:00
parent 34092d2788
commit 61895c5978
70 changed files with 986 additions and 841 deletions
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21
test/constexpr.cpp
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@@ -64,6 +64,27 @@ EIGEN_DECLARE_TEST(constexpr) {
static_assert(dyn_arr(0) == 1);
VERIFY_IS_EQUAL(dyn_arr.size(), 9);
static_assert(dyn_arr.coeff(0, 1) == 2);
// Test matrix addition.
constexpr Matrix3i mat_a({{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
constexpr Matrix3i mat_b({{9, 8, 7}, {6, 5, 4}, {3, 2, 1}});
constexpr Matrix3i mat_sum = mat_a + mat_b;
static_assert(mat_sum(0, 0) == 10);
static_assert(mat_sum(1, 1) == 10);
static_assert(mat_sum(2, 2) == 10);
// Test matrix subtraction.
constexpr Matrix3i mat_diff = mat_a - mat_b;
static_assert(mat_diff(0, 0) == -8);
static_assert(mat_diff(1, 1) == 0);
static_assert(mat_diff(2, 2) == 8);
// Test scalar multiplication.
constexpr Matrix3i mat_scaled = mat_a * 2;
static_assert(mat_scaled(0, 0) == 2);
static_assert(mat_scaled(1, 1) == 10);
static_assert(mat_scaled(2, 2) == 18);
#endif // __cpp_constexpr >= 201907L
}