C++ - Reddit: “explicitly annotated members, so their indices must be exactly 0, 3).…”

Post #25685 20 Jul 29, 2026, 12:23 UTC

explicitly annotated members, so their indices must be exactly 0, 3). Member 'simple_tuple::c' uses index 3.

Example 3:

[[=tuple_element(0)]
[=tuple_element(1)]
long a;

/app/myreflectutils.hpp:632:21: error: static assertion failed: reflectutils: invalid tuple layout for 'simpletuple': member 'simpletuple::a' has 2 tuple annotations; use exactly one of [[=tupleelement(i)]] and [=read_only_tuple_element(i)].

Full code: https://godbolt.org/z/exjW6YGEr

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godbolt.org Compiler Explorer - C++ (x86-64 gcc (trunk)) using namespace reflect_utils; struct [[=tuple_like]] simple_tuple { long a; int b; char c; }; static_assert(std::tuple_size_v<simple_tuple> == 3); constexpr simple_tuple simple { 1, 2, 3 }; static_assert(1 == get<0>(simple)); static_assert(2…

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