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Description of the most important classes, functions and objects of the Standard Language Library, with descriptive fully-functional short programs as examples.
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by LsDefect

Compiles with Visual Studio, but not g++ [Windows Programming]

#include <sstream> #include <vector> #include <filesystem> #include <fstream> #include <shlobj.h> #include <locale> #include <codecvt> #include <windo...

[3 replies] Last: Cool thank you, I tried: g++ impl.cpp -o new.exe -L"C:\Program Files... (by LsDefect)

by Ganado

New account creation is still broken (1,2) [Lounge]

I remember somebody mentioned a while back that new account creation is broken, but I can't find the post*. I tried to make an account just as a test, and the ...

[25 replies] Last: Setting the warning level to /Wall no matter what the project, C/C++ ... (by seeplus)

by JUANDENT

How to write a concept that requires one to create an object to show that copy construction is required? [General C++ Programming]

I need to write the following concept: template<typename T> concept Element = requires (T a, T b) { a = b; T c{ a }; }; [/code] I know I can do [code] r...

[no replies]

by JUANDENT

what are the differences between returning auto, auto&, auto&& and decltype(auto)? [General C++ Programming]

what are the differences between returning auto, auto&, auto&& and decltype(auto)? for instance: auto f(int val) { static int value = val; return va...

[1 reply] : For auto and decltype(auto): https://stackoverflow.com/questions/2136... (by George PlusPlus)

by JamieAl

Error: Using EigenFFT in for loop [General C++ Programming]

I am testing EigenFFT with some Eigen tensors and matrices. I have been so far successful with implementing 1D FFTs along different directions and comparing my ...

[1 reply] : This was my "second" attempt with no errors: for (int k = 0; k < dum... (by JamieAl)

by seeplus

what #define are defined [General C++ Programming]

Within VS or other, for each source file of a solution/project is there a way of obtaining a list of all #define symbols (including within #include files) and t...

[3 replies] Last: Thanks. I missed that one........ (by seeplus)

by seeplus

Another one bites the dust [Lounge]

https://simontoth.substack.com/p/daily-bite-of-c-end-of-line RIP Daily bit(e). You will be missed but never forgotten. For the archive, see https://github...

[1 reply] : The ephemeral nature of the interwebz rules all, unfortunately. C++, ... (by George PlusPlus)

by JUANDENT

are these assignments to temporary valid? [General C++ Programming]

Hi, I have this code where I am not sure the assignments are valid: int g(double x) { return std::floor(x); } double& h(double x) { return x; } // return...

[1 reply] : h[/tt] and [tt]i[/tt] return dangling references. All big compilers (... (by Peter87)

by JUANDENT

vector of unique_ptrs - how to initialize? [General C++ Programming]

Hi, I have a vector of std::unique_ptr<Shape> but cannot initialize it. I tried: vector<std::unique_ptr<Shape>> v{ std::unique_ptr<Shape>(new Circle...

[7 replies] Last: std::initializer_list[/tt] only gives const access to the elements. Y... (by Peter87)

by JUANDENT

cannot instantiate a string literal [General C++ Programming]

I have this code: template<typename ...T> struct Group; template<typename T1> struct Group<T1> { T1 t1_; Group() = default; [[nodiscard]] ex...

[13 replies] Last: To allow std::make_unique[/code] and similar functions to initialize ... (by Peter87)