please wait
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by JUANDENT
cannot instantiate a string literal
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| I have this code: template<typename ...T> struct Group; template<typename T1> struct Group<T1> { T1 t1_; Group() = default; [ ] explicit Gro... |
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Jul 31, 2024 at 4:16pm
[13 replies] Last: To allow std::make_unique and similar functions to initialize aggreg... (by Peter87)
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by JUANDENT
How to define a concept that checks for the size of a parameter pack?
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| I want a concept that requires parameter packs to be of size > 0. I wrote this: template<typename...T> concept NonEmpty = requires {sizeof...(T) > 0; ... |
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Jul 28, 2024 at 11:56am
[2 replies] Last: This seems to work: template<typename...T> concept NonEmpty = sizeof.... (by Peter87)
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by JUANDENT
How to include library feature macros like __cpp_lib_* if importing std only?
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| the library feature macros __cpp_lib_* are defined in header yvals_core.h (for visual C++) which is an implementation header and thus not meant to be included i... |
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Jul 27, 2024 at 7:34pm
[4 replies] Last: Even though <version> was added to C++20 it isn't automatically adde... (by deleted account xyzzy)
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by JUANDENT
function returning an int cannot be assigned to
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| I have a confusion. A function returning a value of type int cannot be assigned to - is it because that return value is an rvalue? but its type is int not int&&... |
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Jul 20, 2024 at 9:17am
[2 replies] Last: b.value() returns an int (not addressable temporary) Correct. The ... (by seeplus)
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by JUANDENT
order of importing does affect the outcome!
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| Reading about C++ 20 modules we find the assertion that the order of importing modules does not matter, and this is always compared with #including headers. I ... |
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Jul 15, 2024 at 9:46pm
[2 replies] Last: the order of importing modules does matter if they are at least vague... (by keskiverto)
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by JUANDENT
subclass does not deduce template argument in class with using std::vector<T>::vector
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| Hi, I have this subclass of std::vector template<typename T> class Vec : public std::vector<T> { public: using std::vector<T>::vector; // use... |
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Jul 14, 2024 at 12:07am
[3 replies] Last: The class needs to be declared with 2 parameters like std::vector! Tha... (by JUANDENT)
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by LsDefect
Unlock mutex when returning
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| The back-end of my application executes a command with _popen and passes the output to the front-end. void Loader::LoadBuffer(const std::string& arg) { ... |
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Jul 9, 2024 at 8:40pm
[2 replies] Last: Whoops you're right, thanks I'll make bufferLoaded atomic. As for out... (by LsDefect)
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by JUANDENT
how to read a single character as with getchar but in C++?
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| Hi, in C one could read a single character from the keyboard with functions like getc() or getchar(). What is the equivalent in C++? streams use buffered inp... |
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Jul 8, 2024 at 3:47pm
[8 replies] Last: in C one could read a single character from the keyboard with functio... (by seeplus)
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by JUANDENT
Strange arithmetic conversions
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| Stroustrup states in C++ Programming Language 4th edition page 271 that the result of converting an unsigned integer to a signed one of possibly larger size imp... |
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Jul 8, 2024 at 8:43am
[5 replies] Last: This is one of the reasons why .ssize()/std::ssize was introduced to g... (by seeplus)
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by JUANDENT
How to clear the buffer for istreams?
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| Hi, what if I want to read only one character of input from the keyboard and want to use streams? so this: char c; cin >> x; will read a charact... |
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Jul 5, 2024 at 3:45am
[1 reply] : https://en.cppreference.com/w/cpp/io/basic_istream/ignore (by salem c)
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by leo2008
c++ array negative numbers
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| I am trying to solve this problem, but got wrong output. Given an array of integers, write a function to move all the negative numbers to the left end of the ar... |
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Jul 2, 2024 at 10:24am
[4 replies] Last: to move all the negative numbers to the left end of the array without... (by seeplus)
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by leo2008
c++ indice 2 numbers
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| I solved the below problem. Can anyone tell me the best way here? Given a list of integers and a target sum, write a function to find the indices of the tw... |
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Jul 2, 2024 at 10:02am
[4 replies] Last: Another way is to use combinations. Consider this which will find the ... (by seeplus)
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by JUANDENT
What is the difference between declaring a variable auto and declaring it auto&&?
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| Hi, I have two variables for a general function f(): auto value = f(); auto&& other = f(); what is the difference between them? |
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Jul 1, 2024 at 2:25pm
[9 replies] Last: Why auto&& and not auto& ? I had to look this one up. && is speci... (by jonnin)
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