@programminginc - страница 471

Ludovic 'Archivist'

For my own tests, that is also the case for traversal if elements are bigger than a memory page

Ludovic 'Archivist'

For my own tests, that is also the case for traversal if elements are bigger than a memory page

Aka 4096 bytes

MᏫᎻᎯᎷᎷᎬᎠ

Aka 4096 bytes

Oh yes Wht Aka means?

Ludovic 'Archivist'

Oh yes Wht Aka means?

Aka = also known as

Ludovic 'Archivist'

Aka = also known as

More literally

MᏫᎻᎯᎷᎷᎬᎠ

Aka = also known as

Thx

olli

For my own tests, that is also the case for traversal if elements are bigger than a memory page

QuickBench doesn't say so http://quick-bench.com/lmsgw3u9Qph-WCSUs74tpA6eUXM

Ludovic 'Archivist'

QuickBench doesn't say so http://quick-bench.com/lmsgw3u9Qph-WCSUs74tpA6eUXM

I was speaking of searching elements, doing this very type of operation just put the load on pushing and pulling stuff, which is for sure faster in vector

Ludovic 'Archivist'

+ vector get SIMDed

olli

For my own tests, that is also the case for traversal if elements are bigger than a memory page

Well, the quick benck code traverses 8k elements

olli

When you need to search quite often another data structure such as set or map may be beneficial

Vincenzo

I am sorry to bother you again but these pointers are struggling me //g++ 5.4.0 #include <iostream> #include <cstring> #include <stdio.h> #include <new> int _size=10; int *_pArray; void p (int *arr, int size){ for (int n=0;n<size;n++){ printf("%d - %d\n",n, *(arr+n)); } } int main(void) { printf("Hello, world!\n"); _pArray = new (std::nothrow) int[_size]; if (_pArray == nullptr) { return -1; } memset(_pArray, 1, _size*10); p(_pArray,_size); return 0; }output: Hello, world! 0 - 16843009 1 - 16843009 2 - 16843009 3 - 16843009 4 - 16843009 5 - 16843009 6 - 16843009 7 - 16843009 8 - 16843009 9 - 16843009

Vincenzo

where do you think is the problem?

BinaryByter

where do you think is the problem?

#goodgoogling

Marie

where do you think is the problem?

https://support.google.com/websearch/answer/134479?hl=en

Anonymous

hello everyone...so sorry i know it's group for c++ learners but currently i am learning html css and php...do you know any useful websites in order to find recourses...i hv a bit difficulty while learning....i am terribly sorry one more time and my big thanks beforehand;-)

BinaryByter

hello everyone...so sorry i know it's group for c++ learners but currently i am learning html css and php...do you know any useful websites in order to find recourses...i hv a bit difficulty while learning....i am terribly sorry one more time and my big thanks beforehand;-)

#googleit

Marie

hello everyone...so sorry i know it's group for c++ learners but currently i am learning html css and php...do you know any useful websites in order to find recourses...i hv a bit difficulty while learning....i am terribly sorry one more time and my big thanks beforehand;-)

http://www.fuckinggoogleit.com/

Vincenzo

well i don't have any idea where to start my research

Vincenzo

if you could at least point me where is the problme

Vincenzo

i don't understand if it is in memset or in the function p

BinaryByter

remove std::nothrow

Anonymous

/notes

Marie

/notes

Notes in chat: - cpp - cppbook - goodgoogling - googleit - ide - learn - meta - noendl - offtopic - ot - projects

BinaryByter

btw, you do memset twice

BinaryByter

and you never assign any value

Anonymous

#projects

Marie

#projects

1. Go to github.com 2. Tap on search. 3. Use advanced search. 4. Go to Advanced Search. 5. Select user's working language. 6. Press the search button. 7. Hover through the repositories and select one of them. 8. Fork it. 9. Do what you want to do. 10. Make a pull request so that the "original owner" can look at the changes and merge them if he feels the need to.

Anonymous

Hey everyone what is better to start game development in c++?

Vincenzo

btw, you do memset twice

i do it one and i assing 1!

Anonymous

SFML or Qt?

Vincenzo

remove std::nothrow

no changes

BinaryByter

read my other messages

BinaryByter

btw

MᏫᎻᎯᎷᎷᎬᎠ

.

BinaryByter

next time

BinaryByter

FOR FUCK'S SAKE

BinaryByter

TELL US WHATS WRONG WITH YOUR PROGRAM

MᏫᎻᎯᎷᎷᎬᎠ

..

Vincenzo

TELL US WHATS WRONG WITH YOUR PROGRAM

i would like to fill my array with any value

Vincenzo

i am testing a function

BinaryByter

i would like to fill my array with any value

And why do you think that your current setup would do what you want to do?

Vincenzo

And why do you think that your current setup would do what you want to do?

memset, it should fill it

BinaryByter

I am sorry to bother you again but these pointers are struggling me //g++ 5.4.0 #include <iostream> #include <cstring> #include <stdio.h> #include <new> int _size=10; int *_pArray; void p (int *arr, int size){ for (int n=0;n<size;n++){ printf("%d - %d\n",n, *(arr+n)); } } int main(void) { printf("Hello, world!\n"); _pArray = new (std::nothrow) int[_size]; if (_pArray == nullptr) { return -1; } memset(_pArray, 1, _size*10); p(_pArray,_size); return 0; }output: Hello, world! 0 - 16843009 1 - 16843009 2 - 16843009 3 - 16843009 4 - 16843009 5 - 16843009 6 - 16843009 7 - 16843009 8 - 16843009 9 - 16843009

why size*10?

Anonymous

use std::fill pls

Anonymous

Any group about c#?

Vincenzo

why size*10?

empiric test, using only _size it appear that it was filled only at the begin

Anonymous

memset only works if you want to fill an array of int with 0 or -1

Anonymous

Since it works by filling each byte with a char

Anonymous

So memset(a, 0, sizeof(a)) would result in something like 0x01010101

BinaryByter

So memset(a, 0, sizeof(a)) would result in something like 0x01010101

^

BinaryByter

next time you google "array of int, memset, not filled correctly"

MᏫᎻᎯᎷᎷᎬᎠ

.

BinaryByter

.

why thouhg?

MᏫᎻᎯᎷᎷᎬᎠ

Hi maxi :)

Vincenzo

memset only works if you want to fill an array of int with 0 or -1

bingo!

BinaryByter

Hi maxi :)

Hey :)

MᏫᎻᎯᎷᎷᎬᎠ

Hey :)

Just came from the future

MᏫᎻᎯᎷᎷᎬᎠ

2020

BinaryByter

you didn't

MᏫᎻᎯᎷᎷᎬᎠ

C++20 is fabulous

klimi

i changed my mind ludo

@qneko i changed it again to back...

BinaryByter

C++20 is fabulous

wait for C++23

Vincenzo

no wait: //g++ 5.4.0 #include <iostream> #include <cstring> #include <stdio.h> #include <new> int _size=10; int *_pArray; void p (int arr[], int size){ for (int n=0;n<size;n++){ printf("%d - %d\n",n, arr[n]); } } int main(void) { printf("Hello, world!\n"); _pArray = new int[_size]; memset(_pArray, -1, sizeof(_pArray)); p(_pArray,_size); return 0; }output: Hello, world! 0 - -1 1 - -1 2 - 0 3 - 0 4 - 0 5 - 0 6 - 0 7 - 0 8 - 0 9 - 0

MᏫᎻᎯᎷᎷᎬᎠ

wait for C++23

I can go back there and look there :-D

Vincenzo

maybe i should do memset(_pArray, -1, sizeof(_pArray)*_size);

BinaryByter

no wait: //g++ 5.4.0 #include <iostream> #include <cstring> #include <stdio.h> #include <new> int _size=10; int *_pArray; void p (int arr[], int size){ for (int n=0;n<size;n++){ printf("%d - %d\n",n, arr[n]); } } int main(void) { printf("Hello, world!\n"); _pArray = new int[_size]; memset(_pArray, -1, sizeof(_pArray)); p(_pArray,_size); return 0; }output: Hello, world! 0 - -1 1 - -1 2 - 0 3 - 0 4 - 0 5 - 0 6 - 0 7 - 0 8 - 0 9 - 0

JUST USE ASN ARRAY OF CHAR

BinaryByter

maybe i should do memset(_pArray, -1, sizeof(_pArray)*_size);

Not even that

BinaryByter