@programminginc - страница 869

Joe

ok no probs i think it was someone else in here then. I`m just sending strings from a server to a client and i used "ostringstream oss" . so after copying the string into oss (oss << "value of string" << "\n" i sent it over a socket using something like send(socket, oss.str().c_str(), ... ) something like that but i can not remember the whole send function and couldn`t find it yet

klimi

ye

klimi

i had tons of tabs

klimi

i hope the purchase cart is still saved

BinaryByter

ok no probs i think it was someone else in here then. I`m just sending strings from a server to a client and i used "ostringstream oss" . so after copying the string into oss (oss << "value of string" << "\n" i sent it over a socket using something like send(socket, oss.str().c_str(), ... ) something like that but i can not remember the whole send function and couldn`t find it yet

yea

BinaryByter

you convert the ostream to a string and then the string to a c-string

Anonymous

Hello . I just want to ask that as we know that void pointer is type independent pointer.. Means we can point memory of any data type with void pointer..than why we don't use void pointer always in every scenario..? Why we declare int pointer, char pointer etc as separately..we can all that stuff with void pointer also.. Can anyone please answer..?

klimi

i hope the purchase cart is still saved

it didnt FUCK

BinaryByter

Hello . I just want to ask that as we know that void pointer is type independent pointer.. Means we can point memory of any data type with void pointer..than why we don't use void pointer always in every scenario..? Why we declare int pointer, char pointer etc as separately..we can all that stuff with void pointer also.. Can anyone please answer..?

in C it doesnt matter

BinaryByter

you can typecast all pointers

BinaryByter

C++ is pointer sensitive

Joe

you convert the ostream to a string and then the string to a c-string

ah ok thanks why is the c-string necessary?

BinaryByter

but a pointer type has something more than just a pointer

BinaryByter

it contains information at compile time about how to interpet a memory location

BinaryByter

ah ok thanks why is the c-string necessary?

because your function probably takes a cstring. if it doesnt, just give it a string

Joe

because your function probably takes a cstring. if it doesnt, just give it a string

ok I`ll give it a try. cheers!

BinaryByter

sure :D

BinaryByter

have fun

Anonymous

C++ is pointer sensitive

Bro.. I always use void pointer with structure.. Can we use it in common scenario..?

Anonymous

Bro.. I always use void pointer with structure.. Can we use it in common scenario..?

Please answer anyone..

BinaryByter

Bro.. I always use void pointer with structure.. Can we use it in common scenario..?

you generally use void pointers when you don't know what datatype you deal with in C

Anonymous

I use it in C++. Not C

BinaryByter

yea, in C++ you should use templates for such a job

BinaryByter

template <class T> void myFunction (T& obj) { std::cout « obj; }

BinaryByter

for example

Anonymous

What about

Anonymous

If I use as

Joe

@linuxer4fun does that make sense? send(new_socket , oss.str().c_str(), strlen(oss.str().c_str()) , 0 );

BinaryByter

oss.str().size()

BinaryByter

strlen is slow

BinaryByter

+ store the string beforehand

BinaryByter

makes you save one call to .str()

Anonymous

Int a=5 Void *ptr =&a; Int *p=static_cast <int>(ptr); Cout<< *p;

BinaryByter

i don't quite get why you would do that?

BinaryByter

also, its a reinterpret_cast

BinaryByter

is it?

Anonymous

I have to type cast void pointer to int pointer..

BinaryByter

yes

BinaryByter

but its a reinterpret_cast

Joe

👌🏼

Anonymous

but its a reinterpret_cast

Yes .u r right bro

Anonymous

Bcoz I'm printing value..not address

BinaryByter

well first of all, in modern C++ you only seldomly need pointers

BinaryByter

second of all, void pointers are something you should avoid like you would avoid rats

BinaryByter

in C++ theres just no reason to use void pointers

Anonymous

Okey.. Thanks bro

Anonymous

👍

Joe

+ store the string beforehand

but when doing oss << "string"; and then calling the send function that´s already the fastest isn`t it?

BinaryByter

but when doing oss << "string"; and then calling the send function that´s already the fastest isn`t it?

streams are slow in general

BinaryByter

if you could avoid the stream and instead just use a string, that would be better

Joe

I once tried it this way but didn`t get it to work.. as of now the stream is relatively fast (but faster is always better ofc). I`m plotting a graph (absorption spectrum) from sensor data and now one full spectrum arrives approx every 200ms. do you think the other option is much faster?

🆂🄾🅼

sir plz do a program in cppb using classb of matrix transpose

🆂🄾🅼

plz sir help fats

🆂🄾🅼

I ve to submit my project tommorow

Anonymous

Copy it from ur book

Stefan

Language: cpp Source: #include <stdio.h> class Slot { public: ~Slot() { printf("Goodbye world!"); } }; int main(void) { Slot ins; return 0; } Result: Goodbye world! Note: cplusplus_gcc assumed, other valid options are cplusplus_clang, visual_cplusplus, you can be more specific next time.

Stefan

now that's a pretty good bot

🆂🄾🅼

Copy it from ur book

CAnt find it

klimi

T.T