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c++/reflection: add fixed test [PR123440]

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This test crashed until r16-7330.  The errors are expected.
Let's make sure the crash doesn't come back.

	PR c++/123440

gcc/testsuite/ChangeLog:

	* g++.dg/reflect/extract10.C: New test.
This commit is contained in:
Marek Polacek
2026-02-18 15:53:01 -05:00
parent 6f777c34c9
commit 77aedc8741
1 changed files with 55 additions and 0 deletions
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55
gcc/testsuite/g++.dg/reflect/extract10.C Normal file
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// PR c++/123440
// { dg-do compile { target c++26 } }
// { dg-additional-options "-freflection" }
#include <meta>
#include <ranges>
using namespace std::meta;
struct test_struct
{
int data_member;
void fn1() {}
void fn2() {}
int getter() { return data_member; }
void setter(int i) { data_member = i; }
virtual int virtual_fn(char*, bool) { return 0; }
virtual int pure_virtual_fn(char*, int) = 0;
static int static_member_fn(bool b) { return b ? 42 : 0; }
};
template<typename T, size_t I>
consteval info get_member_at()
{
constexpr auto ctx = access_context::current();
constexpr auto pointable = [](info i) consteval -> bool {
return !is_destructor(i) && !is_constructor(i) && !is_special_member_function(i);
};
return (members_of(^^T, ctx) | std::views::filter(pointable) | std::ranges::to<std::vector>())[I];
}
template<typename T, size_t I>
consteval info get_member_type() {
return type_of(get_member_at<T, I>());
}
template<typename T, size_t I>
consteval auto get_member_ptr() {
constexpr info member = get_member_at<T, I>();
constexpr info mem_type = add_pointer(get_member_type<T, I>());
using type = typename[: mem_type :];
return extract<type>(member);
}
constexpr auto ex_0 = extract<int test_struct::*>(get_member_at<test_struct, 0>());
constexpr auto ex_1 = extract<void (test_struct::*)()>(get_member_at<test_struct, 1>());
constexpr auto ex_2 = extract<void (test_struct::*)()>(get_member_at<test_struct, 2>());
constexpr auto ex_3 = extract<int (test_struct::*)()>(get_member_at<test_struct, 3>());
constexpr auto ex_4 = extract<void (test_struct::*)(int)>(get_member_at<test_struct, 4>());
constexpr auto ex_5 = extract<int (test_struct::*)(char*, bool)>(get_member_at<test_struct, 5>());
constexpr auto ex_6 = extract<int (test_struct::*)(char*, int)>(get_member_at<test_struct, 6>());
constexpr auto ex_7 = extract<int(*)(bool)>(get_member_at<test_struct, 7>());
constexpr auto ex_8 = get_member_ptr<test_struct, 7>();
constexpr auto test_1 = get_member_ptr<test_struct, 1>(); // { dg-error "value cannot be extracted" }
constexpr auto test_2 = get_member_ptr<test_struct, 2>(); // { dg-error "value cannot be extracted" }
constexpr auto test_3 = get_member_ptr<test_struct, 3>(); // { dg-error "value cannot be extracted" }
constexpr auto test_4 = get_member_ptr<test_struct, 4>(); // { dg-error "value cannot be extracted" }
constexpr auto test_5 = get_member_ptr<test_struct, 5>(); // { dg-error "value cannot be extracted" }
constexpr auto test_6 = get_member_ptr<test_struct, 6>(); // { dg-error "value cannot be extracted" }