Unresolved External Symbol despite including header

[dusky mulch]

When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question run !howto ask.

[manic jay]

!howto ask

[dusky mulch]

How to Ask A Programming Question

Anyone can ask a question in our programming channels. Following the guide Writing The Perfect Question is recommended.

What To Post

State your problem clearly and provide all necessary details:

• the relevant portion of your code, or all of it
• the expected output
• the actual output (or the full error) 🏆 Gold Standard: Minimal Reproducible Example

Where To Post

Provide the relevant code in the message, and format it nicely with a code block*. If it's too much for one message, you can upload it:

• Compiler Explorer for most C/C++ snippets
• OnlineGDB for interaction, debugging ⛔ Do not post screenshots, let alone photos of your screen!

* Use /code if you don't know how to format code blocks

[left heath]

🖕

!close

[dusky mulch]

Thank you and let us know if you have any more questions!

This thread is now set to auto-hide after an hour of inactivity

@left heath

Please Do Not Delete Posts!

Please don't delete forum posts. They can be helpful to refer to later and other members can learn from them. In the future you can use !solved to close a post and mark a post as solved.

[left heath]

!solved

[dusky mulch]

Thank you and let us know if you have any more questions!

This thread is now set to auto-hide after an hour of inactivity

[manic jay]

Rude :/

[left heath]

well idk what to share without sharing 100s of lines so

[main plaza]

Please don't be rude to people trying to help

That guide, if you read it, will tell you how to ask a programming question and what information to share

I.e., the relevant parts of your code and what you've tried and what issues you are running into

[left heath]

again relevant parts being a ridiculous amount because errors are everywhere suddenly

[main plaza]

@left heath Always start with the first error.

The first error from the compiler is the only one you should trust (until you know what to look for), everything else can be a red herring

[left heath]

Everything was fine until it wasn't. I changed one thing and 100+ errors flooded in and didn't know why. It is not as simple as starting with the first error because they all resulted as a result of one change.

I made progress and the first error was not relevant to the solution, so thanks

[main plaza]

Syntax errors tend to snowball

So start with the first one

Click on the output tab in vs rather than the error tab

Send the first error and the relevant code

[left heath]

Nothing like these ones appearing only after my power went out

I'm so confused. I almost had it fixed. Power went out and now my entire project is in FLAMES

3,920 warnings

[main plaza]

Please click on the output tab

[left heath]

First thing in output tab, you got it

error C2039: 'string_view': is not a member of 'std'

and this error only appeared after my power went out.

[main plaza]

Perfect

Do you know how to resolve this error?

[left heath]

string was already included

which is how that type of issue is normally resolved

something is just very, very wrong and idk why

[main plaza]

You need to include <string_view>

!cppref string_view

[dusky mulch]

cppreference.com

std::basic_string_view

template<
    class CharT,
    class Traits = std::char_traits<CharT> >
class basic_string_view;

Defined in

<string_view>

[left heath]

Really? I've literally always used #include <string> for string_view and it has always worked

im using MSVC if it means anything

and it was working before my power went out (that error specifically)

[main plaza]

It's entirely implementation defined what headers might include what other headers. But never rely on it.

Sometimes headers can include partial declarations for things

So thing can seem to work but break later.