Recent questions tagged C++

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c++ - Using boost::bind with boost::function: retrieve binded variable type

Is there any way to retrieve information on what paramaters were bounded by boost::bind or does this need to be stored ... ------ f(); } 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++ - Attributes from Boost.Spirit grammar: error from std:vector of boost::variant

I got a working parser for reading position descriptions for a board game (international draughts, official grammar): ... can I correct 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 MSVC++ .lib files with mingw. Name mangling

I have static C++ library, compiled with MSVC and dll file (library called opennurbs). I need to use this library ... because it's C++ library. 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++ - Do std::random_device and std::mt19937 follow an uniform distribution?

I'm trying to convert this line of matlab in C++: rp = randperm(p); Following the randperm documentation: randperm ... If not, how to do 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++ - vector::erase with pointer member

I am manipulating vectors of objects defined as follow: class Hyp{ public: int x; int y; double wFactor; ... problem? Am I missing something? See Question&Answers more detail:os...

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

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436 views

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c++ - A method to assign the same value to all elements in an array

I have an array with 50 elements int arr[50]; and I want to set all elements to the same value. How can I do 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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c++ - How can a derived class use a protected member of the base class?

Say that a base class A defines a protected member. A derived class B uses this member. class A { ... pattern cannot exist, I acknowledge. 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++ - eigen auto type deduction in general product

I have the following piece of code (I apologize for the slightly larger code snippet, this is the minimal ... getting the same weird behaviour. 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++ - Accessing specific edges in boost::graph with integer index

This is related to a question I had yesterday about accessing vertices using integer indices. That thread is ... methods of accessing edges? 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++ - Issue when loading an ico from a Qt resource file

I am using Qt Designer 4.8.4 and I include two files in the QMainWindow resource file: a .ico file and a . ... the GIF file is working. Cheers, See Question&Answers more detail:os...

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

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378 views

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c++ - How do I add Objective C code to a FireBreath Project?

I am writing a browser plugin for Mac OS that will place a status bar icon in the status bar, which ... still exists. Same compile errors. See Question&Answers more detail:os...

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

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446 views

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c++ - Remove items from two vectors depending on the values inside one vector

I have two integer vectors of equal length. Let's say I want to remove all items in the first vector which are ... C++ way of doing 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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367 views

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c++ - Why std::transform doesn't guarantee the order (but for_each guarantee the order)? Doesn't this allow trick implementation for performance?

I just realize the standard doesn't guarantee the order of applying function callback in std::transform. And ... benefit form this guarantee. See Question&Answers more detail:os...

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

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570 views

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c++ - Watch a memory location/install 'data breakpoint' from code?

We have a memory overwrite problem. At some point, during the course of our program, a memory location is ... need something similar in release. See Question&Answers more detail:os...

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

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423 views

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c++ - Can class template constructors have a redundant template parameter list in c++20

As far as I'm aware, the following code: template<typename T> struct S { S<T>(); }; is well-formed, ... yet to be implemented in all compilers? See Question&Answers more detail:os...

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

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543 views

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c++ - How to understand the call stack of Visual Studio?

VCamD.ax!CFactoryTemplate::CreateInstance() + 0x3f bytes > VCamD.ax!CClassFactory::CreateInstance() + 0x7f bytes What's 0x7f and 0x3f? See Question&Answers more detail:os...

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

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860 views

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c++ - add scrollbar in qt window?

i have been learning qt from video tutorials here. i have completed 35 videos. So i wanted to create a sample ... but i cant. Any solution? See Question&Answers more detail:os...

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

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896 views

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c++ - Disable aero fade-in effect on dialog

I have a modal dialog I'm creating with MFC. When it appears, the Aero theme does it's fade-in ... but without switching Aero off completely? See Question&Answers more detail:os...

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

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602 views

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c++ - Arbitrary dimensional array using Variadic templates

How can I create an Array class in C++11 which can be used like Array < int, 2, 3, 4> a, b; Array < ... does not exist. How can I do 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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426 views

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c++ - Is initializer list like this legal in C++11?

I read the C++ primer 5th edition, which says that newest standard support list initializer. My test code is ... anyone have ideas about 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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706 views

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c++ - Problems passing array by reference to threads

I'm learning threading and I've found some simple examples. What I'm hoping to do is create 5 threads, that each assign a ... () % 2 + 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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474 views

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c++ - From compiler perspective, how is reference for array dealt with, and, why passing by value(not decay) is not allowed?

As we know, in C++, we can pass an array's reference as an argument like f(int (&[N]). Yes, it ... hundred years later, it will be deprecated? See Question&Answers more detail:os...

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

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385 views

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c++ - Find a function by it signature in Windows DLL

Have found a function address in a DLL. Have no source code for this DLL, not mine. This DLL is not ... example on how to implement 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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673 views

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c++ - Preprocessor directives

When we see #include <iostream>, it is said to be a preprocessor directive. #include ---> directive And, I ... "preprocessor" and "directive"? See Question&Answers more detail:os...

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

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534 views

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c++ - Adding external libraries deploying QT app mac OSX

I am facing difficulty while deploying QT app which is using openCV as an external library. In http://doc.qt.io ... , current version 1238.50.2) See Question&Answers more detail:os...

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

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876 views

1 answer

c++ - Conditional definition of elements in an X Macro

Imagine I have an X Macro for a list of items defined something like this: #define X_MACRO(FN) FN(foo) FN(bar) ... do this in a reasonable way? See Question&Answers more detail:os...

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

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576 views

1 answer

c++ - Downcasting a base type

In C++, is it Undefined Behavior if a Base class object is instantiated as a base object, and ... this program cause undefined behavior? See Question&Answers more detail:os...

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

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583 views

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c++ - Multidimensional arrays in eigen library

3 simple questions about the usage and future of the excellent eigen library: Does it have a reason why ... are really multidimensional arrays. See Question&Answers more detail:os...

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

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