Recent questions tagged C++

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c++ - Taking sink parameters by rvalue reference instead of by value to enforce performant usage of interfaces

In a code review, my co-worker and I were discussing the interface for a function I was writing. Our code ... argument one way or the other? 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 spirit memory leak

I am writing a small program to process a big text file and do some replacements. The thing is that it never stops ... lines<<")"<<endl; } } 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++ - Spirit X3, Is this error handling approach useful?

After reading the the Spirit X3 tutorial on error handling and some experimentation. I was drawn to a ... to explain something further. 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++ - Find all differences in an array in O(nlogn) where n is the max range of elements

Question: Given a sorted array A find all possible difference of elements from A, where each element is an integer ... Thank you in advance :) 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++ - Can't read FileVersionInfo with Code Page mismatch

I have some reasonably tried and tested code which uses the Windows API calls to read FileVersionInfo strings, ... "guessing" the codepage? 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++ - linking errors while separate parser using boost spirit x3

I am currentyl trying to separate my boost spirit x3 parser into different _def and .cpp files using BOOST_SPIRIT_DEFINE/ ... << std::endl; } 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++ - Incomplete output from printf() called on device

For the purpose of testing printf() call on device, I wrote a simple program which copies an array of moderate size to ... 0) printf(" "); } } 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 2010 hangs when I debug method AttachThreadInput()

I have Visual Studio 2010 Ultimate SP1 and my project is based on MFC. When I debuging next code of my project ... . What could be the 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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c++ - How to include Apple 'frameworks' on Eclipse CDT

As a follow up to another question I recently asked, I realize my issue is that I don't know how ... properties? Any help highly 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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c++ - cout slowest processor MPI

I am writing a program using MPI. Each processor executes a for loop: int main(int argc, char** argv) { boost ... last processor to get to 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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710 views

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c++ - yaml-cpp read sequence in item

How can I read this YAML file with yaml-cpp: sensors: - id: 5 hardwareId: 28-000005a32133 type: 1 - id: 6 ... iterators, but I don't now how. 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++ - Private constructor and make_shared

I have a singleton class with a private constructor. In the static factory method I do the following: ... constructor but make_shared not? 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++ - Parsing a command language using Boost Spirit

I am building a parser for a command language that I've pieced together from various samples. I've read the Boost Spirit ... 0; } // End of main 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 mov + mfence safe on NUMA?

I see that g++ generates a simple mov for x.load() and mov+mfence for x.store(y). Consider this ... observing the write sooner than planned? 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 not to send WM_PAINT manually

I have read that I should never send WM_PAINT manually and should call InvalidateRect instead but didn't found anything ... ; return 0; } } See Question&Answers more detail:os...

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

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309 views

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c++ - Order of evaluation of expression

I've just read that order of evaluation and precedence of operators are different but related concepts in C++ ... by changing its precedence? See Question&Answers more detail:os...

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

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239 views

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c++ - Using two objects as hash key for an unordered_map or alternatives

Having defined my objects myType, I need to store relations between these objects. These relations are stored on a ... is welcome. 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++ - Thread Wait For Parent

I am implementing a simple thread pool mechanism for my ubuntu server (for my multi-client anonymous chat ... are there other techniques? See Question&Answers more detail:os...

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

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769 views

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c++ - invalid use of non-static member function( in qt)

I've prototyped my function in my mainwindow.h class file(header?): class MainWindow : public QMainWindow { ... void MainWindow::receiveP()'. 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++ - Using enum in loops and value consistency

I'm a big fan of C++'s strong-typing features and what I like the most is to use enumerations while ... in the enumerations Hex and Prime. 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++ - Weight map as function in Boost Graph Dijkstra algorithm

I'm using Boost Graph Libraries and need to use a weightmap which is not constant, but which is a function of ... anyone know how to solve 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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242 views

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c++ - g++ 4.9 rejects valid aggregate initialization in C++14

Consider this code: struct S { int x; double y = 1.1; }; int main() { S s = {0}; } According to the C+ ... it. Is this a known issue for g++? See Question&Answers more detail:os...

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

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552 views

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c++ - System tray context menu doesn't disappear

I create a notification icon with: notifyIcon.cbSize = sizeof(NOTIFYICONDATA); notifyIcon.hWnd = mainWnd; notifyIcon.uID ... ideas? 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++ - Generating function declaration using a macro iteration

I'm trying to generate a function declaration using a macro /* goal: generate int f(int a, float b) */ template<typename ... )(a)(float)(b))); } 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++ - Using SendMessage to enter text into an edit control belonging to another process

I want to set up text in edit box programatically in other program, which is a game app and using directX, but ... .. why one time it worked? 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++ - What are the conversion constructors

class Complex { private: double real; double imag; public: // Default constructor Complex(double r = 0.0, ... , Many many thanks in advance See Question&Answers more detail:os...

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

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147 views

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c++ - BGL dijkstra_shortest_path algorithm method does not accept my color map exterior property

I have been trying to get boost graph lib's dijkstra_shortest_paths to compile for about a week now without avail. I ... up on BGL :( 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++ - Converting Derived** to Base** and Derived* to Base*

Ok, I was reading through this entry in the FQA dealing about the issue of converting a Derived** to a ... isn't available on plain pointers? See Question&Answers more detail:os...

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

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