Recent questions tagged C++

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c++ - What's the best timing resolution can i get on Linux

I'm trying to measure the time difference between 2 signals on the parallel port, but first i got to know how ... better resolution than a PC?? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::vector<Eigen::Vector3d> to Eigen::MatrixXd Eigen

I would like to know whether is there an easier way to solve my problem rather than use a for loop. So here ... this by using a map function? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is modulo operator necessary?

I've read in a document that you can replace mod operation by logical and like this : Instead: int Limit = ... approach if they work the same ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to import depending cython modules from parent folder in python

Imagine the following folder structure: /project run.py /Helper Helper.pxd Helper.pyx setup.py /Settings ... (ext_modules=cythonize(extensions)) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - cout uint8_t as integers instead of chars

#include<algorithm> #include<iostream> using namespace std; int main() { cout << (uint8_t)123 << endl; } ... I configure cout to achieve this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to efficiently shuffle edges in a graph

I am writing a code to shuffle the edges of a graph according to the Configuration Model. In essence, two ... any ideas are welcomed. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Maximum size of local array variable

When I try to run this I get a segmentation fault: #define FILE_NAME "test.html" #define STRING_ARRAY_SIZE 1000000 ... maximum size? Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to install extension-functions.c for sqlite3 on ubuntu

I use sqlite3 on Ubuntu and would like to add the acos and asin functions that are provided by the extension- ... What am I doing wong? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Create thread is not accepting the member function

I am trying to create a class for network programming. This will create a general purpose socket with thread. But ... which I can achieve this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Visual Studio. Debug. How to save to a file all the values a variable has had during the duration of a run?

I am watching a variable that gets assigned thousands of values during a single run. It is being set several ... just using the debugging tools. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - List all the situations when an array is not converted to a pointer to a single element?

So far I have encountered 3 situations where array stays as an array: (assume int arr[3][4];) sizeof(arr) ... a systematic way of deciding it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is RemoveDirectory function not deleting the top most folder?

refer: codeguru.com/forum/showthread.php?t=239271 When using the function below to delete folders, all folders ... trying with process explorer. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Obtain Argument Index while Unpacking Argument List with Variadic Templates

I need to obtain the index of an argument while unpacking and converting argument list. Is there any solution for the ... ,string,bool>(v); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Analysis of float/double precision in 32 decimal digits

From a .c file of another guy, I saw this: const float c = 0.70710678118654752440084436210485f; where he wants ... competition. See more here. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Boost property_tree: multiple values per key

Boost property tree seems like an excellent library to use for parsing config files. However, I can't figure out ... list of numbers like this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - GDI Acceleration In Windows 7 / Drawing To Memory Bitmap

My GDI program runs fine on Windows XP but on Windows Vista and 7 it looks pretty terrible due to the lack of ... for any advice you can offer. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Call a Python function from within a C program

I have an application in C and at some point I need to solve a non-linear optimization problem. Unfortunately ... to link the two programs? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is possible to fix the iostream cout/cerr member function pointers being printed as 1 or true?

If you run the following: #include <iostream> int main() { std::cout.setf(std::ios::boolalpha); std::cout << ... to void*' [-Wpmf-conversions]? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How does "sizeof" work in this helper for determining array size?

I've found this article that brings up the following template and a macro for getting array size: template< ... of return value" instead? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is there a way to do constructor delegation using a conditional in C++11?

I am trying to use C++11 delegation feature to construct a class conditioned on an input value. Is that even possible? The ... A}, x); } } }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Deducing type, when using member function pointer as template argument

When I want to have member function as template argument, is there a way to templetize it without providing ... deduce the Caller type? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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605 views

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c++ - Repeated elements in a std::vector

I have a std::vector and I want to check all the elements in it. If a certain element appears more than ... to counting everything... any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - DirectX Screen Capture - Desktop Duplication API - limited frame rate of AcquireNextFrame

I'm trying to use Windows Desktop Duplication API to capture the screen and save the raw output to a video. I'm ... have no idea what I'm doing). See Question&Answers more detail:...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - boost::any replacement for the code below

I wish get rid of boost dependency on my code. I have the following struct construct. When calling and using this ... ; std::string name; }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calling std::map::emplace() and avoiding unnecessary constructions

I have a std::map whose keys are std::string and values are my own defined type. Let's suppose ... in order to avoid unnecessary constructions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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759 views

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c++ - RcppArmadillo sample on armadillo vector classes

We have been using the sample function from RcppArmadillo to randomly sample a NumericVector object. However, we ... be greatly appreciated :) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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648 views

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c++ - Manipulate Input File Stream

I have a data text file which contains this Map2D, [3, 2] Dot3D, [25, -69, -33], [-2, -41, 58] Map3D ... data in it. Thanks for all your help! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Undefined reference to vtable

I've started learning C++, I know C and Java already. I've started learning it because I want to start ... nothing that would solve my problem. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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