Recent questions tagged C++

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c++ - (WMI) ExecMethod out parameter - ResultingSnapshot is NULL irrespective of the result of the call, Why?

I am using WMI to create an RCT Checkpoint. Below is the code snippet. The problem is when I call the method ... ", 0, &var, CIM_UINT16); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Volatile and CreateThread

I just asked a question involving volatile: volatile array c++ However my question spawned a discussion on what ... if done is not volatile? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - openCV 2.4.10 bwlabel - connected components

Here is the original code from matlab: % Calculate each separated object area cDist=regionprops(bwImg, 'Area'); cDist=[ ... (dst.cols/60.0)); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Get key press in windows console

I found this piece of code online: CHAR getch() { DWORD mode, cc; HANDLE h = GetStdHandle( STD_INPUT_HANDLE ); ... it to detect also these keys? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - When to use "delete"?

I want to store 10 Obj object in objList, but i don't know when is appropriate use delete in this case. If i use ... use "delete Obj;" here? } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How does one rank an array (sort) by value? *With a twist*

I would like to sort an array in ascending order using C/C++. The outcome is an array containing element indexes. ... swap occurred. } } } }; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Compiling Simple static OpenGL 4.0 program using MinGW, freeglut and glew

The problem is in the title, I'll try to list what I've already tried and so on below. First off, ... { glEnableVertexAttribArray(0); } Ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - vector<unique_ptr<A> > using initialization list

I have encountered an error: call to implicitly-deleted copy constructor of 'std::__1::unique_ptr >' when compile code ... that in a header... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - boost serialization, deserialization of raw C arrays

I'm trying to serialize and deserialize raw C pointers and their data, with the example below. It seems to serialize just ... > (m); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to show Windows Explorer context (right click) menu?

I want to show the Windows Explorer context menu. I don't want to add my application to it, I just want ... but language is not important here. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Does g++ meets std::string C++11 requirements

Consider the following example: int main() { string x = "hello"; //copy constructor has been called here. string y( ... << endl; return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What does " for (const auto &s : strs) {} " mean?

What does for (const auto &s : strs) mean? What is the function of colon :? vector<string> &strs; for (const auto &s : strs){ // } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to automatically increase/decrease text size in label in Qt

I have a Qt application where I have a textedit and a label. When a user presses the button, the textedit text ... } ui->label->setText(string); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - read_graphviz() in Boost::Graph, pass to constructor

I have used a python library to generate the following GraphViz .dot file. http://pastebin.com/mL7ck9Zp I want to ... do I go about doing this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Openmp and reduction on std::vector?

I want to make this code parallel: std::vector<float> res(n,0); std::vector<float> vals(m); std::vector< ... so, how can I solve this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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231 views

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c++ - Factor a large number efficiently with gmp

I need to get all the prime factors of large numbers that can easily get to 1k bits. The numbers are ... number(can't choose though). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Range-for-statement cannot build range expression with array function parameter

Why cannot build range expression passing an array as a function argument and using in a range-for-statement. Thanks for ... 9}; increment(v); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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433 views

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c++ - Is there a default hash function for an unordered_set of a custom class?

I'm using a std::unordered_set for the first time and have a question about the hash function. As far as ... and just using the default? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can I stop std::cout flushing on " "?

According to to this post std::cout will automatically flush on when it is attached to an interactive device ... or line buffered mode? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Should Taking the Address of a Templatized Function Trigger its Compilation?

I got an official answer to this question that decltype should not trigger function compilation. In fact decltype ... require it's compilation? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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227 views

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c++ - Utilizing a 32-bit DLL in a 64-bit process via COM

So some time ago I was investigating an issue that I knew would be coming up soon. We have a DLL ... will continue searching in the meantime. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to print a number with a space as thousand separator?

I've got a simple class Currency with overloaded operator<<. I don't know how can i separate the ... solution for this particular situation. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can reinterpret_cast (or any cast) convert xvalues to lvalues?

Is the following code legal (by C++11 and/or C++14 standard(s))? #include <iostream> #include <utility> ... << i_care_for_this_one << endl; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Different execution policies at runtime

In C++17, a number of functions in the algorithm header now can take an execution policy. I can for example ... be a parameter to the function. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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107 views

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c++ - Not possible: this pointer as a default argument. Why?

The following code won't compile. Why? class A { int j; void f( int i = this->j ); } Edit, for clarity. This is what ... void A::f() { f( j ); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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385 views

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c++ - Most efficient replacement for IsBadReadPtr?

I have some Visual C++ code that receives a pointer to a buffer with data that needs to be processed by my ... to change code in one place). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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336 views

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c++ - How to disable automatic mnemonics in a Qt application on KDE?

In any Qt application on KDE when I add a QPushButton in designer and check it's text by: void MainWindow:: ... of a Qt application in anyway? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Stateful functors & STL : Undefined behaviour

I am following this Function objects tutorial Copy-pasta below: I am unable to understand the following: Predicates ... to get corrupted ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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