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make if constexpr macro variadic

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libeigen/eigen!2727

Closes #3102
This commit is contained in:
Charles Schlosser
2026-07-20 10:14:15 +00:00
parent e0f18b799e
commit 8a4a417dde
2 changed files with 20 additions and 2 deletions
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test/constexpr.cpp
+18
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@@ -102,3 +102,21 @@ EIGEN_DECLARE_TEST(constexpr_global) {
static_assert(global_mat.coeff(0, 0) == 1);
}
#endif // __cpp_constexpr >= 201907L
// Check that preprocessor correctly parses and expands EIGEN_IF_CONSTEXPR arguments containing commas
EIGEN_DECLARE_TEST(constexpr_if) {
int true_branch_executed = 0;
int false_branch_executed = 0;
EIGEN_IF_CONSTEXPR (std::is_same<int, int>::value) {
true_branch_executed++;
} else {
false_branch_executed++;
}
EIGEN_IF_CONSTEXPR (std::is_same<int, float>::value) {
true_branch_executed++;
} else {
false_branch_executed++;
}
VERIFY_IS_EQUAL(true_branch_executed, 1);
VERIFY_IS_EQUAL(false_branch_executed, 1);
}