Lol you have undefined behavior
Something I plan caring about later.
Nils
Nils
First I want to care about performance
Nils
Why? For me it works fine
Nils
Just tell me what is shit about it
Nils
Instead of just saying: "It's shit"
Anonymous
Store the string first to a separate variable, then manipulate with c_str
Nils
Ah, okay.
I'll try that
Anonymous
First I want to care about performance
You should not care about performance when your code is ill-formed
Nils
You should not care about performance when your code is ill-formed
I didn't notice that fault, okay?
Anonymous
Hi, my C++ result is slower than exactly the same but converted to python…
Any idea?
C++: https://hastebin.com/nucudajape.cpp
Python: https://hastebin.com/yojicedefo.py
And why are you clearing the buffer? It's not necessary, it will clean itself
Nils
Ah, okay.
Nils
You should not care about performance when your code is ill-formed
https://hastebin.com/pinelozaji.cpp
Better?
Anonymous
Hi, my C++ result is slower than exactly the same but converted to python…
Any idea?
C++: https://hastebin.com/nucudajape.cpp
Python: https://hastebin.com/yojicedefo.py
I'd suggest using rapidjson or boost.json, if you care about performance
Nils
Ah, so jsoncpp is slow? Alright, thx for the suggestion
Anonymous
I'd suggest using rapidjson or boost.json, if you care about performance
@h4cktill, what's the fastest json library?
Till
Nils
https://hastebin.com/pinelozaji.cpp
Better?
Wow after that change the execution time skyrocketed! More than 1 second!
Anonymous
Hi, my C++ result is slower than exactly the same but converted to python…
Any idea?
C++: https://hastebin.com/nucudajape.cpp
Python: https://hastebin.com/yojicedefo.py
And yeah, you've compiled using optimizations?
Nils
in jsoncpp I can simply do cout << root
Nils
does that work there too?
Nils
jsonarray[iternum].FindMember(sby)->value.GetString()
is that correct?
Nils
it looks too odd to be correct lol
Iakovos
Guys need help in developing a windows shell in c language
Iakovos
Any help?
I_Interface
Iakovos
I mean what is F?
Anonymous
what's poppin
Nils
I am trying with rapidjson now, but…
auto node = json_array_find_str_by_str(mesh["nodes"], "hostname", argv[1])
There must be some fundamental error here that I can't figure out.
Nils
error: ‘rapidjson::GenericValue<Encoding, Allocator>::GenericValue(const rapidjson::GenericValue<Encoding, Allocator>&) [with Encoding = rapidjson::UTF8<>; Allocator = rapidjson::MemoryPoolAllocator<>]’ is private within this context
Nils
Nils
What is wrong with it?
auto node = json_array_find_obj_by_str(mesh["nodes"].GetArray(), "hostname", argv[1]);
It causes a warning:
warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
json_array_find_obj_by_str is defined via:
auto json_array_find_obj_by_str(auto jsonarray, char *sby, char *sfor)
Nils
Soved by excepting a const char*
Dima
that’s right, move from python to c++
Dima
:)
Nils
Also, I am trying to write a function that searches for a object in a list (rapidjson). However, the entry simply won't ever get found!
auto json_array_find_obj_by_str(auto jsonarray, const char *sby, const char *sfor) {
for (rapidjson::Value::ConstValueIterator itr = jsonarray.Begin(); itr != jsonarray.End(); ++itr) {
std::cout << (*itr)[sby].GetString() << " : " << sfor << std::endl;
if ((*itr)[sby].GetString() == sfor) {
return (*itr).GetObject();
}
}
throw std::invalid_argument("No such node");
}
(The assertion in line 4 does not work for some reason)
Anonymous
Hello, I am currently studying C, already know java and python, so i thought why not? lol
MᏫᎻᎯᎷᎷᎬᎠ
Asad
Hello, I am currently studying C, already know java and python, so i thought why not? lol
i wish i had this mood
Anonymous
I am currently jotting my notes on wps office. heh.
MᏫᎻᎯᎷᎷᎬᎠ
.
Anonymous
char * or std::string?
Nils
The library is C not C++...
Nils
use std::strcmp() from <cstring> to compare C-style strings
Ah, alright, thank you. Saved it. Do I need to import any other library?
Anonymous
Ah, alright, thank you. Saved it. Do I need to import any other library?
no, <cstring> is part of the standard library
Nils
Btw can you write a program without syscalls? Just out of interest as even if it is just int main() {} there are 20+ syscalls already.
Nils
Even though exactly the same in assembly has just one: exit()
Anonymous
Thx
btw if your project is C++17 or above, you can also use std::string_view to create a view into the string. operator== works on string_views
Nils
Anonymous
Help me please. I am just learn pointer . I have a basic example
Split array into positive and nagative. But it’s not right
Anonymous
Anonymous
Artöm
Anonymous
No. I used free function. Second picture.
MᏫᎻᎯᎷᎷᎬᎠ
MᏫᎻᎯᎷᎷᎬᎠ
Good luck
Artöm
No. I used free function. Second picture.
You allocate in cycle, free outside. Obviously yoy have a leak