please wait
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by seeplus
Uncaught error
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| Consider for VS2022: #include <iostream> int main() { int i {}; auto pi { &i }; try { delete pi; } catch (...) { std::cout << "Caught!\... |
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Aug 31, 2023 at 2:26pm
[16 replies] Last: a null pointer is fine, too 0x0000000000000000: I'm done for!... (by helios)
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by JUANDENT
How to open a file that does not exist? For writing...
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| Hi, I need to open a binary files like this: fstream f; f.open(p, ios::binary | ios::in | ios::out ); but it fails because the file does not exist! I ne... |
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Aug 31, 2023 at 9:47am
[3 replies] Last: If you want to open a file for i/o even if it does not exist, try to o... (by seeplus)
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by jNc
Ubuntu/CPP emulate CTRL+V
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| Need to emulate keyboard input short cut Ctrl+V, using cpp or some wrapper/library Having something in copy buffer (just got it with Ctrl+C) Need to execut... |
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Aug 30, 2023 at 3:44pm
[1 reply] : Maybe, https://stackoverflow.com/questions/1262310/simulate-keypress-i... (by Ganado)
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by jNc
get data from text file and send to text field
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| I need to make something like copy and paste Having file, get string from here, need to send (paste) it to the field where cursor now at. Please advise |
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Aug 29, 2023 at 6:15pm
[3 replies] Last: Im using Qt Editor, but I think it does not matter. It does matter. ... (by kigar64551)
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by JUANDENT
What does this trick do? using unpack = int[]...
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| template<typename... T> std::string get_error_message(T&&... args) { std::ostringstream stream; using unpack = int ; static_ca... |
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Aug 28, 2023 at 5:48pm
[3 replies] Last: Thanks!! (by JUANDENT)
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by JUANDENT
Why do we want perfect forwarding?
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| Hi, why should we use this code: do_print(std::forward<T>(arg)); instead of do_print(arg); I understand the first code will respec... |
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Aug 26, 2023 at 10:12pm
[3 replies] Last: Does this code demonstrates the advantage of using perfect forwarding?... (by JUANDENT)
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by JUANDENT
How to require all elements of a parameter pack to satisfy a concept?
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| See this code: template<typename...T> requires is_arithmetic_v<T>... int sum_by_fold(T...v) { return (v + ... + 0); // add all elements of v starting ... |
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Aug 25, 2023 at 11:46pm
[2 replies] Last: thanks!!! (by JUANDENT)
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by jNc
get inputs from OS application even if app is not active
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| Having some app, made with x11 libs, tested for ubuntu. It takes simple keyboard inputs and outputs corresponding value. It works fine if application window... |
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Aug 25, 2023 at 5:15pm
[2 replies] Last: I've googled a lot /dev/input but still not clue, how to get even smal... (by jNc)
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by darkdave
Unable to link to a c++ dll from VB2019 (1,2)
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| I have upgraded all my projects to VS2019 and yet I still cannot get them to talk to each other between c++ and VB. I tried to add the c++ dll in the VB project... |
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Aug 24, 2023 at 5:20pm
[29 replies] Last: Hi all after, including the .def file in the youtube tutorial i manage... (by darkdave)
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by StMick
Constructor Errors Between Classes
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| I'm building a LinkedList data structure with a nested Node class. The Node class within the LinkedList class looks like this: class Node { public: ... |
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Aug 22, 2023 at 8:57am
[2 replies] Last: Perhaps what you meant to do was LinkedList<Animal *> AList; AList.a... (by helios)
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by JUANDENT
how can I compare the signatures of 2 functions when one of them is a lambda and the other is a regular function?
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| Please read this code and my explanation of the question after it: auto lambda = (unique_ptr<Shape>& ps) { ps->draw(); }; template<typename... |
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Aug 21, 2023 at 6:05am
[3 replies] Last: #include <iostream> #include <memory> #include <array> #include <stri... (by mbozzi)
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by StMick
Undefined Reference to User Defined Type
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| Hello! I have built a LinkedList template class and am trying to test out its functions on a user defined type (another class called Animal in the example be... |
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Aug 20, 2023 at 10:04pm
[3 replies] Last: All the template code should go into the header file. People are gener... (by Ganado)
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by JUANDENT
How can I restrict a template parameter to a certain signature
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| Hi, I have a function template acting on a collection and receiving an operation whose signature is like this: template<typename T> unique_ptr<T> nega... |
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Aug 20, 2023 at 6:32am
[1 reply] : #include <memory> #include <ranges> #include <vector> template < typ... (by JLBorges)
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by JUANDENT
How to test if a container type holds unique_ptr as its elements?
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| Hi, I need a concept that specifies whether a container type's value_type is a specialization of unique_ptr, like this: <vector<unique_ptr<T>> // for ... |
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Aug 20, 2023 at 6:17am
[4 replies] Last: > would that concept hold true even for a std::map ? No. The value_... (by JLBorges)
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by JamieAl
Why do I get segmentation fault error?
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| I am usually pretty good at catching the root of segmentation fault error except this time. I have tested the code several times at different lengths with no su... |
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Aug 12, 2023 at 10:42pm
[6 replies] Last: @Peter87 You are right actually! Thanks! (by JamieAl)
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by JUANDENT
which callable object requires std::forward when passed as an argument?
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| In which cases, when is it important to call std::forward<L>(lambda) as in the following 2 functions (given that lambda stands for some callable object) ... |
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Aug 7, 2023 at 6:41am
[4 replies] Last: So here is a minimal example what std::forward does: #include <iostrea... (by coder777)
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by frek
std::packaged_task
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| std::bind(function, args…) returns a function object that is the result of the given arguments to the given function. What does the line std::packaged_tas... |
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Aug 6, 2023 at 10:22pm
[18 replies] Last: Right. Thanks for your time and info. (by frek)
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by JUANDENT
implementation of std::exchange is not clear...
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| Some code from the standard that has some tricks I do not understand: EXPORT_STD template <class _Ty, class _Other = _Ty> _CONSTEXPR20 _Ty exchange(_Ty... |
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Aug 6, 2023 at 6:14pm
[3 replies] Last: No, you're right. I misread. (by mbozzi)
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by JUANDENT
How does a default move ctor deal with pointers?
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| Hi, Depending on how the compiler implements the default move ctor, this code could duplicate the pointer elements!! class Vector { Vector(int sz) : ... |
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Aug 5, 2023 at 8:51pm
[2 replies] Last: Compiler-generated move constructors copy trivial sub-objects and move... (by mbozzi)
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by frek
Callback vs callable object vs function
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| I'm rather confused about terminology. I think a callback and a callable object are exactly the same thing and they're used like f in STL algorithms (or ... |
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Aug 3, 2023 at 8:57am
[7 replies] Last: OK, thank you very much. (by frek)
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