suggestion: use #pragma once about lokinet HOT 6 CLOSED

though this could be moot because gcc already recognizes common ifndef guards: https://gcc.gnu.org/onlinedocs/cpp/Once-Only-Headers.html

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https://en.wikipedia.org/wiki/Pragma_once wikipedia page on that

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still an unofficial compiler extension on UNIX
hit-or-miss
(yes i've tried this in other projects, get duplicate symbol errors unless i use regular cpp guards)

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gcc (except old version, but that probably doesn't support modern C++ features this project uses) and clang handle it. so does MSVC.
but yeah not supported officially in any C/C++ standard.

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#pragma once isn't cross platform, several (more niche) compilers don't implement it.

More problematically, it's also not standardised, so there are potential incompatibilities (not that I think lokinet is prone to them).

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