Recent questions tagged C++

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c++ - How could one implement an observer_ptr?

I'd like to use observer_ptr in my project, but the paper only defines the interface, not the complete ... way to implement it myself? 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 force Mac window to foreground?

How can I programmatically force a mac window to be the front window? I have the window handle, and want to ... both Carbon & Cocoa for 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++ - using OpenSSL in Visual Studio 2012

I have downloaded the latest release version of Openssl from http://www.openssl.org/source/ I would like to use ... current VS folder /VC/lib 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++ - Balancing a Binary Search Tree (BST)

I'm trying to make a balance_bst(bstNode root) function, but i'm struggling with the implementation. I'm ... given the number of nodes.) 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++ - Could someone please explain the difference between a "reference" and a "pointer" in this case?

When I read litb answer to this question, I learned that passing an array by reference allows us to obtain its ... is translated in each case. 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 typename _not_ needed here in Visual Studio 2008/2010?

In this question, the asker has the following function: template<typename ITER> bool nextPermutation(ITER start, ITER end ... a bug in GCC? 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 construct a <stdexcept> or <system_error> exception without throwing?

Exceptions defined in <stdexcept> (e.g. std::logic_error, std::runtime_error and their subclasses such as ... ::runtime_error(errorMessage); } 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 fix hang in gdb in ld-linux.so.2 when running a 32-bit executable on a 64-bit Ubuntu (18.04) system?

I'm trying to debug a 32-bit executable on a 64-bit Ubuntu system. It runs just fine by itself from the command ... (gdb) cont [hangs again...] 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++ - Active member of an union, uniform initialization and constructors

As the (Working Draft of) C++ Standard says: 9.5.1 [class.union] In a union, at most one of the non ... and how to set it without placement new? 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++ - Detect Internet V. local lan connection

Is there anyway with Windows api to detect whether a Windows 7 computer's network connection is an ... grab that information progammatically? 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++ - Uninitialized memory blocks in VC++

As everyone knows, the Visual C++ runtime marks uninitialized or just freed memory blocks with special non-zero ... d be using Boost for. 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 highlight a string of text within a QTextEdit

I'm a student programmer currently developing an application for work using Qt4. I am building an equation editor and I ... < and > signs used. 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 include Python.h in visual studio

(I do find a lot of similar questions, but so far non of these fits me...) =========== ... /Fo"x64Release" /Fp"x64ReleaseCPlusPlusLearning.pch" 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 send and receive string using MPI

I am trying to send and recieve string using MPI but results are hopless. Send function: MPI_Send(&result, result. ... doesn't want to finish. 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 prevent derived class from making a private/protected virtual function public?

There are good reasons for constructing the base class interface with all virtual functions as private or protected (see ... -to-go-wrong case. 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 can I avoid the LNK2005 linker error for variables defined in a header file?

I have 3 cpp files that look like this #include "Variables.h" void AppMain() { //Stuff... } They all use ... defined in AppMain.obj Why is that? See Question&Answers more detail:os...

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

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362 views

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c++ - Assigning value to function returning reference

#include<iostream> using namespace std; int &fun() { static int x = 10; return x; } int main() { fun() = ... program works fine. Why is it so? 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++ - YUV420 to BGR image from pixel pointers

I am capturing raw output from a decoder which is YUV420. I have got three pointers: Y(1920*1080), U( ... image? YUV Binary files for reference 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 write into an array from a dispatch_apply (GCD) loop?

I have written code to calculate the dynamics of a large set of coupled master equation using the Runge-Kutta- ... better ways 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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c++ - G++ new ABI problems

I got a problem with the new ABI introduced for C++11 in GCC. After upgrading to GCC 5.3 my project does no ... my problem, that I am missing? See Question&Answers more detail:os...

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

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277 views

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c++ - Initialiser list passed as function parameter for array

How do I make this work: void foo(uint8_t a[]) { ... } foo({0x01, 0x02, 0x03}); It gives me an error ... aka unsigned char*}' for argument '1' ^ 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++ - Nested templates vs shift operator

I have been reading all around about be aware >> as ending of nested template and >> as shift operator... ... > Compiler is smarter these days? See Question&Answers more detail:os...

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

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490 views

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c++ - RegOpenKeyEx fails on HKEY_LOCAL_MACHINE

Hi I'm trying to read a registry value that gives me the path to firefox.exe. This is stored ... ,KEY_QUERY_VALUE,&keyHandle) == ERROR_SUCCESS) 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 rule 3 in section 3.3.7/1 from N3936 redundant?

I recently answered a question dealing with a violation of draft C++14 standard: N4140 section 3.3.7 Class ... cases that requires both rules? See Question&Answers more detail:os...

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

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478 views

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c++ - Is comma operator free from side effect?

For example for such statement: c += 2, c -= 1 Is it true that c += 2 will be always evaluated first, ... updated value from expression c += 2? See Question&Answers more detail:os...

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

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392 views

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c++ - "Overloading" pure virtual function with different set of arguments

Consider following code sample #include <iostream> using namespace std; class Color { public: virtual void mixColors ... appreciate any 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++ - What is meant by char temp[3]="";?

Normally in C++, character arrays are initialized in the following way, char example[5]="cat"; What ... character array after initialization? See Question&Answers more detail:os...

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

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593 views

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c++ - Taking input from stdin after freopen()

Hi I want to how can we take input from stdin again after I invoke: freopen("Smefile.txt","r",stdin); Precisely I ... <a<<" "<<b; 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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