please wait
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by JUANDENT
Why does move not erase the source?
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| Hi, I have this code: vector<string> coll1 = { "Hello", "this", "is", "an", "example" }; list<string> coll2; move(coll1.begin(), coll1.end(), back_... |
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Mar 28, 2024 at 12:16pm
[9 replies] Last: thank you all!! (by JUANDENT)
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by JamieAl
1D FFTs of an Eigen tensor
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| So I am trying to take an FFT along a specific direction of an Eigen tensor, similarly to my code in MATLAB. In MATLAB: Nx = 8; Ny = 6; Nz= 8; Lx =6; Ly =... |
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Mar 28, 2024 at 12:18am
[10 replies] Last: I was trying to take the 1D FFT along each direction separately to un... (by JamieAl)
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| C++23 Formatting Ranges |
| C++23 added the ability to "print out" using formatting options a container directly instead of having to use some form of a loop to access each element individ... |
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Mar 23, 2024 at 5:05pm
[5 replies] Last: I would recommend two books, one on C++20 and the other on C++23, by t... (by deleted account xyzzy)
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by Zaap
vector push_back passing size from 0 to overflow
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| Hi, please see the following code and the associated prints. I also add the Argument class below. Basically, it crashes the second time it goes in the loop b... |
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Mar 17, 2024 at 10:39pm
[3 replies] Last: Bumping this to just give some insight that might be generally helpful... (by Ganado)
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by JUANDENT
The object itself (this) is it a leak if its constructor throws?
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| if the ctor throws, then the object this has already received the memory (some new or alloc has been executed)... so, does the object this leak? the only possi... |
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Mar 17, 2024 at 7:43pm
[7 replies] Last: Excellent comments! Thank you again!! (by JUANDENT)
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by JamieAl
Convert MATLAB function to C++
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| I have a function from a textbook: https://people.maths.ox.ac.uk/trefethen/spectral.html Basically it calculates the Chebyshev differentiation matrix and I hav... |
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Mar 15, 2024 at 10:55pm
[14 replies] Last: @mbozzi I think the problem is that duyk is too small to hold the en... (by JamieAl)
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by Zaap
Threading: changing processor count does not change performances
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| Hi, I've been doing some multi-threading in my program. This program essentially iterates over a dataset and for each line computes some stuff. My multi-t... |
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Mar 15, 2024 at 4:00pm
[8 replies] Last: [quote=Zaap]I think using a for_each in my code will create an excessi... (by TheIdeasMan)
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by JamieAl
Why is my fft function not working as expected?
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| Trying to take the fft of 2D array along one direction (x for example and not y) so it's a 1D FFT of 2D array. I have done this successfully before using Eigen ... |
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Mar 15, 2024 at 7:06am
[9 replies] Last: it makes no difference whether you store your matrix row or column maj... (by jonnin)
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by JUANDENT
Cyclic dependencies - how to deal with them?
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| Hi, I have a class GridCtrl that delegates to GridCtrlHandler but GridCtrlHandler must also be able to call methods on GridCtrl. I cannot have GridCtrl.h ... |
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Mar 14, 2024 at 4:34pm
[6 replies] Last: Heh, I created a circular dependency issue using modules and Visual St... (by deleted account xyzzy)
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by JUANDENT
why use decltype(auto) return type instead of auto?
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| Hi, I have this code namespace detail { template <class F, class Tuple, std::size_t... I> decltype(auto) apply_impl(F&& f, Tuple&& t, std::index_sequence<I.... |
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Mar 5, 2024 at 1:57am
[3 replies] Last: I swear modern C++ is a minefield Too bad there's no golden idol acr... (by deleted account xyzzy)
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by Cplusc
MPI Blocking and Non_Blocking Communication
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| I'm currently working on a lattice Boltzmann code (D3Q27) employing MPI for parallelization. I've implemented MPI 3D topology for communication, and my code sni... |
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Mar 4, 2024 at 5:03pm
[7 replies] Last: @mbozzi thanks for your help. In your algorithm, I assume there's a ... (by Cplusc)
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