April 28, 2026
Compile-time chaos, now with extra drama
Things C++26 define_static_array can't do
C++ gets a shiny new shortcut, but fans say the language still makes everything a boss fight
TLDR: C++26 adds a simpler way to bake precomputed data into programs, replacing a clunky workaround developers used before. But commenters say the language still turns basic tasks into a struggle, making this feel like progress wrapped in the usual C++ chaos.
C++ just unveiled a cleaner way to turn data figured out at compile time into a fixed block baked into your program: define_static_array. In plain English, it’s supposed to replace an awkward old workaround nicknamed the “constexpr two-step,” where developers had to jump through hoops to turn a temporary result into something permanent. Sounds like a win — except the celebration in the comments quickly turned into a support group.
The loudest mood was basically: why does this language always make simple things feel cursed? One commenter groaned that in C++, you have to “fight it with all you have,” using features in ways that feel like accidents rather than design. Another called the whole thing “so on-brand for C++,” which is either loving shade or devastating praise, depending on your tolerance for pain. Even the article’s dreamy line about compile-time work happening in “the compiler’s imagination” got applause, with one reader joking they’d need an AI assistant just to try these features without feeling “like a hopeless idiot.”
There was also real debate under the snark. Some readers tried to unpack whether this is all about speeding programs up by baking data directly into the finished app, while others wondered if alternate memory tools could solve the same problem. But the main drama is clear: C++26 offers a slicker shortcut, yet it still can’t handle several common cases — so the community reaction is equal parts finally and seriously, not again?
Key Points
- •The article explains that global constexpr or constinit objects cannot directly contain pointers to memory created only during compile-time evaluation, including heap allocations inside non-empty std::vector or std::list objects.
- •A workaround called the "constexpr two-step" computes data in a constexpr container and then copies the contents into a std::array with compile-time-known size.
- •The article cites Barry Revzin’s P3491 and Jason Turner’s C++ On Sea 2024 talk as references connected to the constexpr two-step term and formulation.
- •C++26 introduces std::define_static_array, which can materialize compile-time-computed data into a static-storage constant array and expose it through std::span.
- •The article states that std::define_static_array is limited by std::meta::reflect_constant and therefore does not support some cases, including non-structural types such as std::optional<int>, std::string, std::string_view, and std::span itself.