it gives `multiple definition of f123`

I know if I move defenition in cpp file it will work, but why it doesn't work if it is in h-file

it's why #ifndef is made for...

You have to make it inline or define the function in a separate cxx file

You have to make it inline or define the function in a separate cxx file

yes, I know, but why it doesn't work in h-file, #ifndef should prevent "multiple definition", right?

yes, I know, but why it doesn't work in h-file, #ifndef should prevent "multiple definition", right?

Ifdefs work in a translation unit. You probably have many of them in your app

Ifdefs work in a translation unit. You probably have many of them in your app

if you mean "source file" - yes, but it also should work in h-file

if you mean "source file" - yes, but it also should work in h-file

Not exactly. I go with big simplification, because compilers nowadays doing some smarter things but the idea is the same. Imagine your program as a group of cpp files where everything that is #included is actually included in them. Some headers can be included twice but then include guards will disable duplicated code. Each that thing is a translation unit. You have several translation units that are compiled each in an object file (if I correct with naming). Then you have linker that will link code that calls with code that define what is called. And there you have a problem when you have definitions in header files, because you have many definitions of one thing.

And in reality these definitions can be different so it's not safe to take just random one

Can anyone here teach me C program and c++

?

#personal_trainer

#personal_trainer

fuck rose is broken

fuck rose is broken

Wtf did you do to her?

Wtf did you do to her?

You'll see next time you open your favourite website ^^

Not exactly. I go with big simplification, because compilers nowadays doing some smarter things but the idea is the same. Imagine your program as a group of cpp files where everything that is #included is actually included in them. Some headers can be included twice but then include guards will disable duplicated code. Each that thing is a translation unit. You have several translation units that are compiled each in an object file (if I correct with naming). Then you have linker that will link code that calls with code that define what is called. And there you have a problem when you have definitions in header files, because you have many definitions of one thing.

so this #ifdef works for every object file separatelly, so every object will have double of the code... ok, thanks

Do i request pdf for educational purpose

Do i request pdf for educational purpose

how dare you

/ban

Hey, need to create wsdl file for the soap web service but I dunno how and what to use for that. I need something like wsdl editor with design mode and etc. but I didn't find any open source apps. Thanks in advance.

structure padding and so on

Structure padding is allocation of more data than mentioned in a structure is that correct?

I don't understand why this happens

Hai im system information student, nice to meet you all

hola

.

I don't understand why this happens

.

Who’s good in sorting arrays?

*starts headbanging*

*starts headbanging*

( ͡° ͜ʖ ͡°)

Who’s good in sorting arrays?

A computer with a good algorithm

*starts headbanging*

*raining blood*

A computer with a good algorithm

Good then not you

Good then not you

I've coded more sorting algorithms than you can think, don't judge so quickly

I've coded more sorting algorithms than you can think, don't judge so quickly

Just like your algorithms, won’t judge quickly ( ͡° ͜ʖ ͡°)

Please tell me about friend function in C++

Please tell me about friend function in C++

Friend function is a function that makes friends

It takes 2 uid as parameters and outputs social.life.relationships.status

It allows you to instantiate classless function/operator which can be applied to these two classes/structs

Friend function is a function that makes friends

Is there a fornicate function over that too?

I think he meant an operator

So if you have the relationshipstatus, would that trigger a divorce when both are married or won't the compiler figure out they're cheating?

Can they have kids?

Hi

I have a question, how does windows c++ implement process hiding and port hiding?

I found out that Google searched a lot of information, and did not find any related functions/APIs that could implement Windows process hiding, port hiding, or port multiplexing communication.

I hope that friends who know this technology can help me to provide some information for me to study.

I like your profile pic

If I can provide some relevant information, I will not be grateful. I searched for related technical cases on github and did not find it. If you can tell me the research direction in related fields, I will go deeper and understand.

I like your profile pic

Thank you

I like your profile pic

Have you ever understood the technical details in my question?

I am trying to generate a key from a given functions made by me, but I want to add randomize algorim without repetition similar as I do in python using secrets , but how can I do it in c++? my variable seq which store one , two , three, four , but once I want to concatenate my functions to generate my key if I change to std::vector<std::string my t it return an error of std::basic t = string.ascii_lowercase + string.ascii_uppercase + string.digits + string.punctuation key = ''.join([secrets.choice(t) for _ in range(20)]) int main(){ std::vector<std::string> seq{ "One", "Two", "Three", "Four" }; std::string t = reverse.ascii_lowercase() + reverse.ascii_uppercase() + reverse.digits() + reverse.punctuation(); std::cout << reverse.join(seq, "--") << std::endl; std::cin.get(); }

Who knows the technical details?

Ask Nobody help here anw 😂

*starts headbanging*

here, use this mat, will allow for less pain when headbanging

alternatively, quit the internet

will reduce the amount of headbanging

(please give me your postal adress first tho 😂)

here, use this mat, will allow for less pain when headbanging

I have taken special measures... Or atleast my religion did... So don't worry

I have taken special measures... Or atleast my religion did... So don't worry

OH right, you wear a colander 😂

/* conddetab.c : Extend entab and detab to accept the shorthand entab -m +n to mean tab stops every n columns; starting at column m. choose a convenient (for the user) default behaviour */

what does this part mean: tab stops ... it means tab is allowed, or removed ?

Can you guys suggest some good websites for coding competitions 😁

Can you guys suggest some good websites for coding competitions 😁

Code chef

Have 4G internet access for super sim pls anwer me

Code chef

thanks👍😁

I am trying to generate my key random and joining a few hyphen after the key , but however when I try to do this I got no suitable user-defined conversion from "std::vector<std::string, std::allocator<std::string>>" to "std::string" on the other hand how can I include srand(time(NULL)); instead of declaring them every time on main . is will possible to include it on my random function? typedef unsigned int uint; std::string randomString(uint length, std::string string){ std::vector<uint> indexesOfRandomChars(length); // array of random values that will be used to iterate through random indexes of 'charIndex' for (uint i = 0; i < length; ++i) // assigns a random number to each index of "indexesOfRandomChars" indexesOfRandomChars[i] = rand() % string.length(); std::string key = ""; // random string that will be returned by this function for (uint i = 0; i < length; ++i)// appends a random amount of random characters to "randomString" { key += string[indexesOfRandomChars[i]]; } return key; } int main() { srand(time(NULL)); std::vector<std::string> t{ reverse.ascii_lowercase() , reverse.ascii_uppercase() , reverse.digits() , reverse.punctuation() }; std::cout << reverse.join(randomString(15, t), "--") << std::endl; std::cin.get(); }

/warns

Has anyone worked with AVR or ARM ?

did you get myRand?

Which one do you prefer: typedef some_long_declaration alias; Or using alias = some_long_declaration; ?

Does Anyone know qt c++?

still the same problem I cannot use it like this std::cout << reverse.join(randomString(15, t), "--") << std::endl;

I cannot send it as std string because join function it will break. how can I send it to randomstring into one?

using my login

what does join do is to join 2 strings of the iterable

I got the same ` std::cout << reverse.join(randomString(20, std::accumulate(std::begin(t), std::end(t), std::string())), "--") << std::endl; ` error std:string to const vector