yes
https://pastebin.com/kj3VF2z3
the CarBuilder object seems to be capable of creating Car objects. is it not capable of destroying them?
Anonymous
Sergey
the CarBuilder object seems to be capable of creating Car objects. is it not capable of destroying them?
Yes
It can create but not destroy
As I understand Builder pattern not supposed to destroy objects
Anonymous
Anonymous
Hello
Anonymous
Can someone please help me with C++?
Anonymous
Nils
Hi, can somebody recommend a flask-like framework for C++?
infi ptr
Nils
infi ptr
First upload code to pastebin/hastebin so we can read/debug it better
my bad, forgot it. wait.
Hermann
i have char a_size []="xxxx" and char a[4], why fegts over a, why fgets(a, 5, stdin) delete a_size?. is a null pointer the problem?
infi ptr
Nils
https://pastebin.com/rei84JrR
@Nils
tip when using "\n": You should use just '\n' as it's one single character
Nils
For performance etc
Nils
I am still debugging…
Anonymous
Can I send you invite link to gitlab?
Cause there are not so little files
sure i guess. working on something besides book exercises seems like a fun idea
Anonymous
yes
https://pastebin.com/kj3VF2z3
i made some changes to your code, but can't really compile it without rest of the sources
infi ptr
tip when using "\n": You should use just '\n' as it's one single character
that part is locked ! only part accesibble is the function
Sirr Dessy
please i need help with this
Anonymous
Hi, can somebody recommend a flask-like framework for C++?
https://github.com/ipkn/crow last commit 2017 though
Javi
infi ptr
You are making the iterator invalid inside the for loop.
what i should i fix to eradicate that ? lil bit confused.
Javi
If the container is going to change inside the loop, don't use iterators
Anonymous
hii🥳
Anonymous
so you tell me
Anonymous
Anonymous
guys program not run
Anonymous
you tell me why should not run
I_Interface
Anonymous
i dont know
Anonymous
i very try it
Anonymous
how become run
Anonymous
auto keyword error showing in this program
Anonymous
please guys tell me today/tomorrow plz
Anonymous
okk see u
Nils
Why is that impossible:
std::map<std::string, std::function<void()>> testmap;
testmap["blah"] {
// Some code
}
?
Nils
Is there some way to get it to work?
Anonymous
Why is that impossible:
std::map<std::string, std::function<void()>> testmap;
testmap["blah"] {
// Some code
}
?
> Why is that impossible
std::function isn't a function declaration, it just holds pointers to other callable objects that already exist
Anonymous
Is there some way to get it to work?
yes. lambdas can be assigned to testmap["blah"] =
Nils
So I can't use it to store functions/create function and store pointer directly inside maps?
Nils
yes. lambdas can be assigned to testmap["blah"] =
So I just have to replace { with =?
Nils
That makes no sense, what would happen to }?
Anonymous
do you know how to write lambdas?
Nils
Nope
Nils
Why is that impossible:
std::map<std::string, std::function<void()>> testmap;
testmap["blah"] {
// Some code
}
?
could you probably simply give me an example of how I would have to change this code?
Anonymous
could you probably simply give me an example of how I would have to change this code?
// some code
isn't enough :/
Nils
Okay, wait…
Nils
// some code
isn't enough :/
testmap["argv"] {
// Check amount of arguments
if (args.size() != 1) {
return badarguments;
}
// Check argument
auto argsit = args.begin();
if (!is_float(*argsit))
return badarguments;
// Get argument
float sleepsecs = std::atof((*argsit).c_str());
sleep(sleepsecs);
return success;
}
Is that enough?
Anonymous
testmap["argv"] {
// Check amount of arguments
if (args.size() != 1) {
return badarguments;
}
// Check argument
auto argsit = args.begin();
if (!is_float(*argsit))
return badarguments;
// Get argument
float sleepsecs = std::atof((*argsit).c_str());
sleep(sleepsecs);
return success;
}
Is that enough?
this is quite large for a lambda. just write a function and assign the name to testmap["argv"]
Nils
Okay, thx
Anonymous
this is quite large for a lambda. just write a function and assign the name to testmap["argv"]
(not that you can't write a lambda this large, just that it would be unusual. further, the function looks stateless which is another reason to not use a lambda)
Nils
this is quite large for a lambda. just write a function and assign the name to testmap["argv"]
So I tried this now:
#define command_args std::vector<std::string> args
#define command_rawtmpl(func) func(command_args)
#define command_tmpl(func) std::string command_rawtmpl(func)
typedef std::function<command_rawtmpl(std::string)> command_type;
std::map<std::string, command_type> commands;
#define command_register(func) commands[#func] = func;
...
command_tmpl(whatever) {...}
command_register(whatever);
But it results in:
source/pilang2.cpp:123:32: error: ‘commands’ does not name a type
123 | #define command_register(func) commands[#func] = func;
| ^~~~~~~~
Why?
Nils
For some reason my code looks like spaghetti inside Telegram 🤔
Look at it inside some IDE
Anonymous
ohhhh
Nils
With macro magic
Nomid Íkorni-Sciurus
Nomid Íkorni-Sciurus
you only need # for renaming left-side symbols
Nils
oh okay
Nomid Íkorni-Sciurus
and?
Nomid Íkorni-Sciurus
It changed nothing
let's see the "nothing"
Show both code and error
Ludovic 'Archivist'
I tried
But doesn't know either this advise doesn't help or this style of destructors shouldn't help
https://pastebin.com/A1aUcqgr
child classes must override the virtual destructor, which is not the case in your code
Nils
Ahhh I have to do the assignment inside a function!
Anonymous
So I tried this now:
#define command_args std::vector<std::string> args
#define command_rawtmpl(func) func(command_args)
#define command_tmpl(func) std::string command_rawtmpl(func)
typedef std::function<command_rawtmpl(std::string)> command_type;
std::map<std::string, command_type> commands;
#define command_register(func) commands[#func] = func;
...
command_tmpl(whatever) {...}
command_register(whatever);
But it results in:
source/pilang2.cpp:123:32: error: ‘commands’ does not name a type
123 | #define command_register(func) commands[#func] = func;
| ^~~~~~~~
Why?
please stop using the preprocessor for anything other than #include and feature test macros
Nils
please stop using the preprocessor for anything other than #include and feature test macros
But it adds flexibility 🙄
Imagine that you want to change which arguments these functions receive. You would have to change every single function definition…
Nils
Like that you have one, single place where you can modify such