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whereami
Locate the current running executable and the current running module/library on the file system 🔎 (by gpakosz)
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Let the user pass the path/filename as an input argument to the program. Your main() function takes arguments from the console, so you could invoke your program as .\my_program --err_log "\path\to\my_errors.log". Of course this again only works if executed from the console - you can however create a desktop shortcut that invokes your program with this argument and you can also configure your IDE to pass this argument when running your program. To make parsing input arguments easier, use a library such as cxxopts
Find the path of the executable and save the file relative to this. This is beyond standard C++ and you have to use the API of the Operating System. There is luckily some people that made cross platform libraries for this, such as whereami.