Or systems programmer

This

app.h(320): Error C4668 : 'INTERNAL_EXPERIMENTAL' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif' 10>app.h(341): Error C4668 : 'INTERNAL_EXPERIMENTAL' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif' 10>app.h(353): Error C4668 : 'INTERNAL_EXPERIMENTAL' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif' 10>app.h(382): Error C4668 : 'INTERNAL_EXPERIMENTAL' is not defined as a preprocessor macro, replacing with '0' for '#if/#elif' trying to compile Firebase sdk in my unreal engine project and taking this error. someone know how to fix it? i changed cpp standards in project but it not helped

https://github.com/firebase/firebase-cpp-sdk/issues/44 seems related. are you compiling the latest sdk?

hi I am new and I want to learn c++ can you please give me the best sources to start and study c++

hi I am new and I want to learn c++ can you please give me the best sources to start and study c++

guys, where is windows absolute path to cpp #include <objc/objc.h> file?

That depends on what build system you use if any. Normally it'll search the standard include directories

I'm on windows 11. I'm trying to compile firebase-cpp-sdk. I've been stuck on this for three days now. It looks like it cannot be compiled...

Explain what you're doing. Just because it doean't happen for you doesn't mean it can't.

I trying to integrate firebase sdk to my unreal engine project. I download prebuilded files and headers from their github, integrated it and linked to my unreal engine project. I getting error "Cannot open include file: 'objc/objc.h': No such file or directory". So, i can't found this file on my pc. When i deleting this line i getting linker LNK2019, LNK2001 errors. I tried google this, many sites give me information it's mvsc compiler issue, because it's old. I updated this, but taking this errors again. My head will destroy with this SDK.

I linked it by Unreal Build Tool. this is function where i taking all static libraries private List<string> GetStaticLibraries() { List<string> Output = new List<string>(); if (Target.Platform == UnrealTargetPlatform.Win64) { Output.AddRange(new[] { Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_analytics.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_app.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_app_check.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_auth.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_database.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_dynamic_links.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_firestore.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_functions.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_gma.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_installations.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_messaging.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_remote_config.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_storage.lib"}) }); } // and other stuff, telegram does not allow me to send message bigger return Output; }

You're adding them to win64 platform. Shouldn't this be android?

This is firebase part of code where error occurs: #ifdef FIREBASE_PLATFORM_ANDROID #include <jni.h> #else if FIREBASE_PLATFORM_IOS || FIREBASE_PLATFORM_TVOS extern "C" { #include <objc/objc.h> } // extern "C" #endif // FIREBASE_PLATFORM_ANDROID, FIREBASE_PLATFORM_IOS, // FIREBASE_PLATFORM_TVOS

I don't think so. It's basic include files of firebase sdk. I can't see versions of headers for each platforms here is one unique version for all platforms.

it finds FIREBASE_PLATFORM_IOS or FIREBASE_PLATFORM_TVOS so the definitions are there

I'm using Auth part of firebase sdk. It is in allowed libs list.

can you share the exact errors?

This is firebase part of code where error occurs: #ifdef FIREBASE_PLATFORM_ANDROID #include <jni.h> #else if FIREBASE_PLATFORM_IOS || FIREBASE_PLATFORM_TVOS extern "C" { #include <objc/objc.h> } // extern "C" #endif // FIREBASE_PLATFORM_ANDROID, FIREBASE_PLATFORM_IOS, // FIREBASE_PLATFORM_TVOS

Hmm, it can't find objc.h because it's supposed to be in ios

Okay, well, I think we should stop racking our brains now. I’d rather give up SDK and use REST. Thank you very much for your help! And sorry for wasting your time. Good luck in everything!

I mean, you're building the project for ios. It needs to build on xcode which will provide objc.h as a platform

Yeah, i understand. But i don't have iOS device and this will be waste of time. I'll drop this idea at this moment.

From the docs, it seems for desktop there's different set of libraries. https://firebase.google.com/docs/cpp/setup?platform=android#desktop-workflow

But it's your decision in the end.

I linked it by Unreal Build Tool. this is function where i taking all static libraries private List<string> GetStaticLibraries() { List<string> Output = new List<string>(); if (Target.Platform == UnrealTargetPlatform.Win64) { Output.AddRange(new[] { Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_analytics.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_app.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_app_check.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_auth.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_database.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_dynamic_links.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_firestore.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_functions.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_gma.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_installations.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_messaging.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_remote_config.lib"}), Path.Combine(new[] {"VS2019", "MD", "x64", "Release", "firebase_storage.lib"}) }); } // and other stuff, telegram does not allow me to send message bigger return Output; }

Is it possible to redirect input coming from some std::istream to some std::ostream?

https://www.geeksforgeeks.org/dup-dup2-linux-system-call/amp/

Is it possible to redirect input coming from some std::istream to some std::ostream?

Here is answer from ChatGPT: Yes, it is possible to redirect input from an std::istream to an std::ostream in C++. This is commonly done using a loop that reads from the istream and writes to the ostream. Here's a simple example using C++ standard streams: #include <iostream> int main() { std::istream& input = std::cin; // This could be any input stream, e.g., a file stream std::ostream& output = std::cout; // This could be any output stream, e.g., a file stream char buffer[256]; while (input.getline(buffer, 256)) { output << buffer << std::endl; } return 0; } In this example, input and output are references to std::cin and std::cout, respectively. The program reads lines from the input stream and writes them to the output stream. You can modify this to use other types of streams, like file streams (std::ifstream and std::ofstream), by changing the initialization of input and output.

So there is no standard way to do this

What I'm looking for is something related to streambuf class

Hello I am working on an MFC app I want to create the following usage scenario Go to windows file explorer Select many files of .txt Hit ENTER and open all files in one instance of the MFC APP Can anyone give me instructions or a helpful link? Thanks in advance

Must be possible same way VLC can open multiple files in one or multiple instances

It is apparently possible to leak memory in C++ without calling new and just using the standard libraries. I just found out about it. And this is not implementation specific either. This happens on all implementations. https://youtu.be/LKKmPAQFNgE

Hm, he calls front() on an empty vector, it is UB. In other words, some containers have some functions that have preconditions. If the preconditions are not satisfied when the function is called, the program enters UB (undefined behavior). And after UB is entered, no valid behavior is guaranteed anymore (in any place of the program).

He calls v.emplace_back() before calling v.front(). It is a a video from C++ Meeting that is attended by some of the biggest names in C++ ecosystem. So they won't make silly mistakes 😉

He calls v.emplace_back() before calling v.front(). It is a a video from C++ Meeting that is attended by some of the biggest names in C++ ecosystem. So they won't make silly mistakes 😉

It is apparently possible to leak memory in C++ without calling new and just using the standard libraries. I just found out about it. And this is not implementation specific either. This happens on all implementations. https://youtu.be/LKKmPAQFNgE

Could you please share a recap? I'm unable to watch the video, but interested

Could you please share a recap? I'm unable to watch the video, but interested

If the derivation from std::vector bothers you, you can as well make std::vector a member of struct V and call it child and replace all occurrences of v in the above code with v.child and this problem happens still. This guy Bjorn Fahller has 100s of such snippets that all lead to memory leaks without using new.

You can redirect std::ostream to another std::ostream Using rdbuf std::ofstream out("file.txt"); std::cout.rdbuf(out.rdbuf()); std::cout << "This line goes to the file.txt";

Any idea of how to accomplish this or I'm missing something?