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{fmt} used to support pre-C++11 compilers that didn't have variadic templates. It was a pain to emulate variadics but it wasn't impossible.

Wow, I don't know that! I would be curious to know how they did it.

Oh, I didn't realize you're the author! Thank you so much for fmt/std::format - it's truely a godsend!

Glad you like it =)

It was emulated using horrible macros: https://github.com/fmtlib/fmt/blob/8f5e07656e25ec64ec7c843f0.... IIRC some early versions of `std::tuple` did something similar.