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Re:F-strings for C++26 proposal [pdf] by boguscoder on Monday February 03, 2025 @12:49AM (#42915363)
Those are c++17
Re:F-strings for C++26 proposal [pdf] by pjmlp on Monday February 03, 2025 @01:43AM (#42915619)
Initially, C++20 and C++23 extended its use cases, and combined with concepts is a pretty sweet spot for compile time metaprogramming without SFINAE or tag dispatch tricks.

Much better than having yet another syntax for macros.