I have tried and successfully ran example given at GitHub. But when I am using with my own code then getting segmentation fault error.

This is too broad questions. It's better to read documentation https://developers.google.com/protocol-buffers/docs/proto3. Without code and knowing your configuration it's just a random guess what went wrong.

@JRandomGuy thanks

Is there any performance issue in using “using” directive as “using namespace std” and just explicitly typing std each time?

Is there any performance issue in using “using” directive as “using namespace std” and just explicitly typing std each time?

no

using namespace std; is bad

Oh it's a matter of choice? I mean it's just a standard convention?

Oh it's a matter of choice? I mean it's just a standard convention?

imagine having some other library with the same methods

calling just ::min will be ambigious

Oh it's a matter of choice? I mean it's just a standard convention?

As long as you're not writing using std in header it's fine.

calling just ::min will be ambigious

That i know it's ambiguous what i am saying is something different

That i know it's ambiguous what i am saying is something different

well how come it can affect a performance lol

Nope i had seen some senior developers explicitly typing std each time that's what make me think so.

Nope i had seen some senior developers explicitly typing std each time that's what make me think so.

thats the right way

typing std:: instead of using namespace is much better

but it has nothing with performance

thats the right way

That's what i asked it is a standard convention.

but it has nothing with performance

Yup.

That's what i asked it is a standard convention.

It's how you prevent collisions in naming

well your question must be confusing then:)

well your question must be confusing then:)

Yes now i get it why they explicitly type each time.

but it has nothing with performance

It can affect in theory compilation time. Compiler has to do more resolutions

I've this vector std::vector<ros::Publisher*> pub; and I want to push different object with different topic_name pub.push_back(new ros::Publisher(topic_name.c_str(), str_msgs[i])); Now, I've solved the problem with the topic name, but the push_back push the third object three times

imu_0 //First iteration imu_1 //Second iteration imu_1 //Second iteration imu_2 //Third iteration imu_2 //Third iteration imu_2 //Third iteration Why?

imu_0 //First iteration imu_1 //Second iteration imu_1 //Second iteration imu_2 //Third iteration imu_2 //Third iteration imu_2 //Third iteration Why?

You need to post your loop or something . It's hard to tell from the posted sample.

for(int i = 0; i < MAX_SIZE; i++){ std::string topic_name = topic_root + std::to_string(i); pub.push_back(new ros::Publisher(topic_name.c_str(), str_msgs[i])); for(uint8_t i=0; i < pub.size(); i++) Serial.println(pub[i]->topic_); }

this is the loop, the second one is for debug

Why are you using same names for all variables?

topic_names, i ?

Why are you using same names for all variables?

it is a for loop, does it really matter?

topic_names, i ?

i is just a counter

do u think I should put the declaration of topic_name out?

I'm on a phone and can't see properly your code, but there is no reason to reuse variable names in the same loop. Does it cost you anything? 😉

Nope ahahah

Let me test

nope, nothing has changed, https://hastebin.com/mirafaroqo.cpp

imu_0 //First iteration imu_1 //Second iteration imu_1 //Second iteration imu_2 //Third iteration imu_2 //Third iteration imu_2 //Third iteration Why?

it will be strange, but the output is this

it will be strange, but the output is this

This code looks similar to what you're trying to do here https://onlinegdb.com/Hy2dE2lfI ( from my understanding of missing parts) and the results is as expected:

Were my additions to missing parts of a code wrong and that's not what you're trying to do ?

This code looks similar to what you're trying to do here https://onlinegdb.com/Hy2dE2lfI ( from my understanding of missing parts) and the results is as expected:

First of all, thanks a lot... Let me finish one thing and I will try

wait, let me test

wtf, that's my code ahahah...why the output is not the same

wtf, that's my code ahahah...why the output is not the same

Probably the issue is somewhere else in definitions of classes, printing method or something like that

Maybe the publisher object assign the same address, but i can't understand why

I want to learn gui development using c++ where should i began?

Which library should i prefer?

Which library should i prefer?

imgui

Okay.

And can you tell me what is QT and GTK+ ?

And can you tell me what is QT and GTK+ ?

Qt is widget toolkit for creating graphical user interfaces gtk too

And ImGui is also similar?

Is ImGui Cross platform library?

I want to learn gui development using c++ where should i began?

I think Qt has great documentation and is very popular. So my suggestion is Qt. Of course this is only an opinion. There is no one size fits all answer.

I think Qt has great documentation and is very popular. So my suggestion is Qt. Of course this is only an opinion. There is no one size fits all answer.

Yes i searched on google for a while QT seems to be popular.

Yes i searched on google for a while QT seems to be popular.

It has great documentation as well. And is more popular on stackoverflow so it's easier to get answers. ( not very scientific apporach ;) https://stackoverflow.com/questions/tagged/qt https://stackoverflow.com/questions/tagged/imgui https://stackoverflow.com/questions/tagged/gtk

And ImGui is also similar?

It’s immediate rendering

I want to learn gui development using c++ where should i began?

use GTK

https://twitter.com/pati_gallardo/status/1222931733483589636?s=19 😅😅

I want to learn gui development using c++ where should i began?

qt is great

And can you tell me what is QT and GTK+ ?

gtk is C though and linux only

Hey everyone

Can anyone review my code?

It is a calculator based on stack

Thanks

I prefer a pastebin/compiler explorer link

I prefer a pastebin/compiler explorer link

Ok

I prefer a pastebin/compiler explorer link

https://pastebin.com/axmnrxCJ

Instructions to use: Use symbols given below bracket : "(" Plus: "+" Subtract: "-" Divide: "/" Multiply: "*" Power: "^"

Which is the most preferable Linux distribution for Programmer's?

Currently i am using Ubuntu 18.04 LTS but due to Nouveau graphics card it's unstable for my machine.

https://pastebin.com/axmnrxCJ

Too complicated

Currently i am using Ubuntu 18.04 LTS but due to Nouveau graphics card it's unstable for my machine.

I am using third party graphics software and sometimes it is very irritating.

Too complicated

So how to make it easy or readable? Any tips?

So how to make it easy or readable? Any tips?

Atleast write some proper comments so that the reader knows what you are writing.

Okie👍

Atleast write some proper comments so that the reader knows what you are writing.

will write😁

Okie👍

Try to write line by line comments explaining each line.

Ohkie

The algorithm can be simplified very much