Recent questions tagged c++

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c++ - How should one log when an exception is triggered?

In a program I recently wrote, I wanted to log when my "business logic" code triggered an exception in third- ... a temporary object as before. 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++ - TMP: how to write template code which converts any struct into a tuple?

Is it possible to use template meta-programming to convert any struct or class into a tuple? For instance: ... examples to get going quickly. 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 alias for static member functions?

Is there a way to alias a static member function in C++? I would like to be able to pull it into ... variable available at global/static scope. 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::erase(item) needs assignment operator to be defined for item?

I have a class C which does not define operator=. I have am trying to use a vector like so: std::vector<std:: ... :vector<std::pair<C,D>> cs_; 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++ - Confusion in regards to purpose/behavior of -Waggregate-return?

While looking at the GCC's warning options, I came across -Waggregate-return. -Waggregate-return Warn if any ... ' in the second example? 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 doesn't std::noskipws work, or what is it supposed to do?

First off my understanding is that cin >> std::noskipws >> str; should stick a whole line from cin like "i ... there a way to make this work? 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++ - Does C# have a std::nth_element equivalent?

I'm porting some C++ code to C#. Does C# have an equivalent to std::nth_element() or do I need to roll my own? 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++ - Date to Day of the week algorithm?

What is the algorithm that, given a day, month and year, returns a day of the week? 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++ - CMake: How to specify directory where ctest should look for executables?

I wanted to integrate ctest to a c++/c project. I use google tests to write unit tests. Relevant part of ... in order to find the executable? 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 guarantee of stdout auto-flush before exit? How does it work?

Here is the code (valid C and C++) #include <stdio.h> int main() { printf("asfd"); // LINE 1 return ... hood and why does it work as expected? 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 we use threads inside the member function of class?

This is mine base class class IDialysisConnector { public: HANDLE threadHandle_; virtual int ConnectToMachine() ... to 'LPTHREAD_START_ROUTINE'" 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 hide console windows when calling system()?

currently im using system(""C:Program FilesCommon Filesmicrosoft sharedinkTabTip.exe""); to open up the virtual keyboard ... of that? 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++ - CreateRemoteThread, LoadLibrary, and PostThreadMessage. What's the proper IPC method?

Alright, I'm injecting some code into another process using the CreateRemoteThread/LoadLibrary "trick". I end up ... with the original process? 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++ - BSTR's and VARIANT's under... mac os x

Under mac os x I have office 2011 and its excel and VBA, and I have gcc-5.3.0's g++. I played a lot to ... ) MsgBox (x) 'FAILURE... End Sub Executing this VBA code now successively...

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

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c++ - clang++: error: linker command failed with exit code 1 Qt Android

Unable to build Qt examples . Getting error while building in windows E:android-ndk-r20-windows-x86_64android- ... NDK configuration Qt version 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 does std::getline() skip input after a formatted extraction?

I have the following piece of code that prompts the user for their cat's age and name: #include <iostream> ... it. Why does this happen? 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++ - Variadic templates with exactly n parameters

I want to make a variadic template with exactly N arguments, where N is also a template parameter. ... not necessarily involving static_assert. 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++ - forward declarations

Why do I need to use forward declarations for a class when I am already including the relevant header file? ... class where you put #include. 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++ - Deploying Qt applications in Linux properly

I have written an application using Qt and I am trying to deploy it. I built my application it and tried ... results in the image appearing. 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 copy constructor is not called here?

For the following code : #include<iostream> using namespace std; class Test { public: Test(const Test &t) { cout<<"Copy ... t3 = t2; 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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c++ - GDB prints wrong values

I've got a bit of a problem with debugging a C++ program using GDB. When I use print object.member, it doesn't ... I don't know what to try now. 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 overload resolution work in the context of private modifier?

I am unable to understand the output of the following C++ snippet. Should not objc.fn() call A's fn() since B's ... objc; objc.fn(); 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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c++ - OpenCV: how to create .vec file to use with opencv_traincascade

As I explained in my previous post here, I am trying to generate some cascade.xml files to recognize euro coins ... to gray scale could 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++ - VTK Render into C#

I have a c++ application that uses VTK, I want to have vtkRenderWindow and put it into C# WPF project without using C# wrapper. 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++ - Algorithm to get Cartesian product

I have an array like [0,2,3,0,1] as input , and I need to find Cartesian product of {0}x{0,1,2}x{0,1 ... I would like to write it in c++. 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++ - Wait for signal while processing other signals

My Qt application talks to a serial device, and occasionally has to wait for this device to send a byte. To ... canonical way to resolve 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++ - DLL dependency question / SetDLLDirectory

I have the following situation and can't come up with any good solution. I have a C++ application ( ... before getting there. Any suggestions? See Question&Answers more detail:os...

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

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861 views

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c++ - how do I allocate one block of memory with new?

I have a two dimensional array that I've allocated dynamically using new. The problem is I want to allocate the memory ... [0] + ylength*i; } See Question&Answers more detail:os...

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

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