General C++ Programming - March 2024

by JUANDENT
Why does move not erase the source?
 
Hi, I have this code: vector<string> coll1 = { "Hello", "this", "is", "an", "example" }; l...
[9 replies] Last: thank you all!! (by JUANDENT)
by JamieAl
1D FFTs of an Eigen tensor
 
So I am trying to take an FFT along a specific direction of an Eigen tensor, similarly to my code in...
[10 replies] Last: I was trying to take the 1D FFT along each direction separately to un... (by JamieAl)
by deleted account xyzzy
C++23 Formatting Ranges
 
C++23 added the ability to "print out" using formatting options a container directly instead of havi...
[5 replies] Last: I would recommend two books, one on C++20 and the other on C++23, by t... (by deleted account xyzzy)
by Zaap
vector push_back passing size from 0 to overflow
 
Hi, please see the following code and the associated prints. I also add the Argument class below. ...
[3 replies] Last: Bumping this to just give some insight that might be generally helpful... (by Ganado)
by JUANDENT
The object itself (this) is it a leak if its constructor throws?
 
if the ctor throws, then the object this has already received the memory (some new or alloc has been...
[7 replies] Last: Excellent comments! Thank you again!! (by JUANDENT)
by JamieAl
Convert MATLAB function to C++
 
I have a function from a textbook: https://people.maths.ox.ac.uk/trefethen/spectral.html Basically ...
[14 replies] Last: @mbozzi I think the problem is that duyk is too small to hold the en... (by JamieAl)
by Zaap
Threading: changing processor count does not change performances
 
Hi, I've been doing some multi-threading in my program. This program essentially iterates over a ...
[8 replies] Last: [quote=Zaap]I think using a for_each in my code will create an excessi... (by TheIdeasMan)
by JamieAl
Why is my fft function not working as expected?
 
Trying to take the fft of 2D array along one direction (x for example and not y) so it's a 1D FFT of...
[9 replies] Last: it makes no difference whether you store your matrix row or column maj... (by jonnin)
by JUANDENT
Cyclic dependencies - how to deal with them?
 
Hi, I have a class GridCtrl that delegates to GridCtrlHandler but GridCtrlHandler must also be ab...
[6 replies] Last: Heh, I created a circular dependency issue using modules and Visual St... (by deleted account xyzzy)
by JUANDENT
why use decltype(auto) return type instead of auto?
 
Hi, I have this code namespace detail { template <class F, class Tuple, std::size_t... I> declty...
[3 replies] Last: I swear modern C++ is a minefield Too bad there's no golden idol acr... (by deleted account xyzzy)
by Cplusc
MPI Blocking and Non_Blocking Communication
 
I'm currently working on a lattice Boltzmann code (D3Q27) employing MPI for parallelization. I've im...
[7 replies] Last: @mbozzi thanks for your help. In your algorithm, I assume there's a ... (by Cplusc)
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