The web content explores a core language feature in C++26 proposed by Corentin Jabot and Micheal Park in P2169R4, introducing a cool unnamed placeholder. The motivation behind this feature is to address the issue of unused variables causing compilation errors with higher warning levels. By using the [[maybe_unused]] attribute, developers can mark variables they want to ignore. However, in scenarios involving multiple ignored variables or structured bindings, the use of std::ignore or ranges might be necessary. The new solution allows developers to use “_” as a placeholder without issues, presenting a familiar concept with some restrictions. The feature is already implemented in GCC 14 and Clang 18.
https://www.sandordargo.com/blog/2025/01/08/cpp26-unnamed-placeholders