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Just saw the use of stdexp::optional in the program(C++). Google search result points me to std::optional. It is something not common or it is something that maybe custom defined somewhere in my program?

example:

stdexp::optional<std::string> foo;

I'm a beginner in C++, so if someone can break down this into simple terms, that would be great

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    It's impossible to answer without the actual code but it's likely an alias to std::experimental. See en.cppreference.com/w/cpp/header/experimental/optional - Note that since C++17 optional is part of the standard, not experimental anymore. Commented Nov 24, 2021 at 14:14
  • @Holt found it in the code namespace stdexp { using std::experimental::optional; } Thanks! Commented Nov 24, 2021 at 14:22
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