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General C++ Programming - July 2021 (Page 4)

I have a header file and a cpp like this, in the mesh::mesh_build I get the error explicit type is missing,how can I solve it?

[14 replies] Last: Sure. (by Cplusc)

by Cplusc

+= overloading operator

Imagine we want to do something like below with defining operator overloading. for (int i=0;i<n_element;i++) { NN = NN + NN_e ; NN = NN...

[15 replies] Last: What do you mean by "do the assembly"? Are you trying to return 6 num... (by dhayden)

by SirEnder125

Help with copy/swap semantics for class with smart pointer (1,2)

Hello. I recently started learning about smart pointers and such, mutexes and what-not. I wanted to make an int array class that holds a dynamically allocated...

[20 replies] Last: Thanks again for the clarification. (by seeplus)

by Cplusc

Pointer and reference

Sorry for my naive question. I have been working with c++ for a short time and I never understood well when I should pass a vector or matrix by pointer or by a...

[4 replies] Last: pass by reference unless you can demonstrate a clear need to use a poi... (by jonnin)

by cmisip

How do I create an array of templated class as members of another class

How do I iterate over rows and columns array to create Output objects in the class MyClass that I can refer to in pin array index? The pin array of Output obje...

[15 replies] Last: Thanks a lot for all the pointers. I have to admit that at this time ... (by cmisip)

by jhbardwell

Trouble splitting code into core loop and satellite programs

I recently started learning C++ and SDL2 because my ideas stretched beyond my skills. I'm not entirely new to programming, having done some R and python in the ...

[2 replies] Last: I get long lists of errors involving missing or duplicate definitions... (by seeplus)

by wheelspawn

Boost: Cannot open include files

I am working with Boost/bjam, trying to create a Python wrapper over some C++ code. I am getting this error message from my wrapper: wrapper.cpp(1): fatal er...

[15 replies] Last: It is possible that you did not set Additional Include Directories in ... (by Tyler552)

by sleepyjamil

Having a problem with finding the smallest number in an array.

Hello i need help regarding this one assignment of mine. I have to cout the smallest element in the array for each of the mark (1-5) but I didn't proceed with m...

[4 replies] Last: Perhaps consider: #include <iostream> #include <iomanip> #include <... (by seeplus)

by hbcpp

Get the address bar url from a browser

I would like to know how can I get the url from the address bar in a browser, I would like to do it preferably in the most popular browsers like firefox, chrome...

[9 replies] Last: Found the solution : https://www.cplusplus.com/forum/windows/279044/ (by hbcpp)

by Hyung

Do a function by taking information from file

I have a coding to find standard deviation from the file provided. My lecturer suggest to do it in function. I managed to get rid of the error. However i get 0 ...

[7 replies] Last: #include <iostream> #include <fstream> #include <sstream> #include <v... (by lastchance)

by JUANDENT

Definition of ITER_CONCEPT(I)

ITER_CONCEPT(I) is defined in https://en.cppreference.com/w/cpp/iterator/random_access_iterator But I have the following doubts? Definition of this con...

[no replies]

by pj33

How to install DCMTK

Hello I am new in c++ but i'm trying to install the DCMMTK library but I'm confussed. Can someone give me a clear set of instructions because I was confused wit...

[1 reply] : OS? Compiler? This looks to cover it in great detail for windows / ... (by jonnin)

by muttalKadavul

Capturing only a specific member of a class inside lambda

I understand that we have to capture the *this pointer in the lambda to access any of the member variables inside the lambda. Now, why can't I capture only a si...

[3 replies] Last: You can do this (I think it's C++17?) #include <iostream> class Fo... (by seeplus)

by Cplusc

undeclared identifier

I have included my class in the main.cpp file but I get this error. error C2065: 'coordinate': undeclared identifier error C2065: 'connectivity': undeclared ide...

[5 replies] Last: I can't comprehend your code and have no idea what it's up to so I'm n... (by dutch)

by becho66

ordered hashmap recommendation

Does anyone know ordered hashmap libraries similar to boost/container/flat_map? I couldnt find proper libraries for ordered hashmaps on the internet. Thanks in ...

[9 replies] Last: What do you find inefficient about boost's flat_map? Inserting items?... (by AbstractionAnon)

by wheelspawn

Fatal error while building Boost Python binding: cannot open input file 'boost_python.lib'

My build keeps encountering a fatal error, and I cannot find out why this is the case. I copied all of the Python libs from boost_1_76_0\lib64-msvc-14.1 into my...

[3 replies] Last: Ah, okay. Thanks. (by wheelspawn)

by kseokjk

How to make function from this coding

I have coding that needs to find the many values such as highest, smallest, standard deviation, and many more. I was thinking that would the coding be easier to...

[4 replies] Last: for this, one function actually makes more sense to me, because you wo... (by jonnin)

by leo2008

C++ fopen_s not declared in scope

I understand fopen_s is not part of C++ std library. How can I replace it qwith std::fstream? Also I need to replace malloc and free with new and delete operato...

[3 replies] Last: Hello leo2008, I just noticed that you have a file "Header.h". You ne... (by Handy Andy)

by kseokjk

Could not print out inside the for loop

I have coding that needs to print out the file and also find some value from the file. This is my coding : #include <iostream> #include <fstream> using nam...

[3 replies] Last: Thank you so much @seeplus. I have run it and it works. Thank you very... (by kseokjk)

by dune

Creating an Array on the heap

I think I get this, but I'm just not sure. Given the following code: int * applyAll(const int *const arr1, size_t size1, const int *const arr2, size_t size2)...

[5 replies] Last: @seeplus: Why not use std::vector? Much easier. The coding exercise,... (by dune)

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