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Make element accessors constexpr

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This commit is contained in:
Tyler Veness
2024-11-14 01:05:29 +00:00
committed by Charles Schlosser
parent 8b4efc8ed8
commit 0fb2ed140d
4 changed files with 43 additions and 30 deletions
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28
test/constexpr.cpp
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@@ -16,38 +16,48 @@ EIGEN_DECLARE_TEST(constexpr) {
// until after the constructor returns:
// error: member ‘Eigen::internal::plain_array<int, 9, 0, 0>::array’ must be initialized by mem-initializer in
// ‘constexpr’ constructor
#if EIGEN_COMP_CXXVER >= 20
#if __cpp_constexpr >= 201907L
constexpr Matrix3i mat({{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
VERIFY_IS_EQUAL(mat.size(), 9);
VERIFY_IS_EQUAL(mat(0, 0), 1);
static_assert(mat(0, 0) == 1);
static_assert(mat(0) == 1);
static_assert(mat.coeff(0, 1) == 2);
constexpr Array33i arr({{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
VERIFY_IS_EQUAL(arr(0, 0), 1);
static_assert(arr(0, 0) == 1);
static_assert(arr(0) == 1);
VERIFY_IS_EQUAL(arr.size(), 9);
static_assert(arr.coeff(0, 1) == 2);
constexpr RowVector3i vec{{1, 2, 3}};
static_assert(vec(0, 0) == 1);
static_assert(vec[0] == 1);
VERIFY_IS_EQUAL(vec.size(), 3);
static_assert(vec.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.
constexpr Matrix<int, Eigen::Dynamic, Eigen::Dynamic, 0, 3, 3> dyn_mat({{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
VERIFY_IS_EQUAL(dyn_mat.size(), 9);
VERIFY_IS_EQUAL(dyn_mat(0, 0), 1);
static_assert(dyn_mat(0, 0) == 1);
static_assert(dyn_mat.coeff(0, 1) == 2);
constexpr Array<int, Eigen::Dynamic, Eigen::Dynamic, 0, 3, 3> dyn_arr({{1, 2, 3}, {4, 5, 6}, {7, 8, 9}});
VERIFY_IS_EQUAL(dyn_arr(0, 0), 1);
static_assert(dyn_arr(0, 0) == 1);
static_assert(dyn_arr(0) == 1);
VERIFY_IS_EQUAL(dyn_arr.size(), 9);
static_assert(dyn_arr.coeff(0, 1) == 2);
#endif // EIGEN_COMP_CXXVER >= 20
#endif // __cpp_constexpr >= 201907L
}
// Check that we can use the std::initializer_list constructor for constexpr variables.
#if EIGEN_COMP_CXXVER >= 20
#if __cpp_constexpr >= 201907L
// EIGEN_MAKE_UNALIGNED_ARRAY_ASSERT() will fail constexpr evaluation unless
// we have std::is_constant_evaluated().
constexpr Matrix<int, 2, 2> global_mat({{1, 2}, {3, 4}});
EIGEN_DECLARE_TEST(constexpr_global) {
VERIFY_IS_EQUAL(global_mat.size(), 4);
VERIFY_IS_EQUAL(global_mat(0, 0), 1);
static_assert(global_mat(0, 0) == 1);
static_assert(global_mat(0) == 1);
static_assert(global_mat.coeff(0, 0) == 1);
}
#endif // EIGEN_COMP_CXXVER >= 20
#endif // __cpp_constexpr >= 201907L