Recent questions tagged C++

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c++ - using type alias doesn't work with "const" pointer

Here, const pointer hold the address of const variable. like : #include <iostream> int main() { const int i ... not work with using Type alias? 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 sort() in STL to sort an array

I am writing code for a question which is: Write a method to sort an array of strings so that all the anagrams ... .end, compare); ??? } 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++ - Parse JSON array as std::string with Boost ptree

I have this code that I need to parse/or get the JSON array as std::string to be used in the app. ... empty string. What could be wrong 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++ - Listing Unused Symbols

I want to remove dead code from a largish project and would like to start with unused symbols. Is there ... objdump) perform the same function? 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 implementation of "move semantics" and "rvalue reference"

I came across a Youtube video on c++11 concurrency (part 3) and the following code, which compiles and generates ... .join(); 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++ - Objective-C in Qt with Mavericks

I've been using Objective-C mixed with C++ in Qt without any issues; using .mm files where required. After ... how I can fix these 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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c++ - No matching call to default constructor, when using QVector

I have a class B that creates an object of a class A and calls a method of the object. a.h #ifndef A_H ... whole class A in the class 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++ - How do you determine the size of the nodes created by a 'std::map' for use with 'boost::pool_allocator' (in a cross-platform way)?

UPDATE Per comments, answer, and additional research, I have come to the conclusion that there is typically no ... ? Is this even possible? 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 change the working directory to the location of the program

I want to use c++ to open a file on Mac OS. If I run the program under Xcode, the working directory is the ... endl; fin.close(); 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++ - Find never-called functions

I'm doing some refactoring in a project using Qt with Visual Studio 2008, and I'd like to know if there' ... and methods that are never called? See Question&Answers more detail:os...

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

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357 views

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c++ - Center the Text of QTextEdit horizontally and vertically

I want to center the text of my QTextEdit horizontally and vertically. I tried this, but it didn't work. ... set it centered with a StyleSheet? 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++ - Inherit and overload default constructor

I've been searching for this and I'm amazed I haven't found anything. Why can't I inherit a base class constructor ... int main() { B 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++ - Template return type deduction from lvalue?

This might be a silly question but I would like to have it clarified none the less. Lets say I have a template ... but why this is as well? 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 am I getting this 'enum' is not a class or a namespace error?

I need call a method with this signature in my Manager class: void createPlayer(Player& player, PlayerType& ... of the createPlayer method. 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 programmatically check Internet bandwidth in VC++?

I need to find the bandwidth available at a particular time. The code must be developed in Visual C++ or in . ... knows how, please help me out. See Question&Answers more detail:os...

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

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472 views

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c++ - zlib in Qt - QtZlib not present

I am using QuaZip library, which has zlib dependency. I want to compile my CMake managed application under Archlinux ... under Qt5 using CMake ? See Question&Answers more detail:os...

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

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356 views

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c++ - Qt, Mouse skipping, not updating every pixel, mouseMoveEvent()

I working on a simple paint program. It seemed Qt (and KDE) would be a easy way to implement it. I find ... from 2 points that gets registered? See Question&Answers more detail:os...

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

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386 views

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c++ - Code to strip diacritical marks using ICU

Can somebody please provide some sample code to strip diacritical marks (i.e., replace characters having accents, ... been normalized. 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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230 views

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c++ - Unhandled exception on OpenCV+VS2010

I can build and execute the code below successfully : IplImage* img = cvLoadImage("C:\hello.jpg"); cvNamedWindow ... win7 on Release mode only. 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++ - redefinition of variable inside scope

Why does the following code compiles, under g++, with out any warning or error? The problem I see is that the variable ... std::cout << x; } } 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++ - Parse a substring as JSON using QJsonDocument

I have a string which contains (not is) JSON-encoded data, like in this example: foo([1, 2, 3], "some ... . Does anybody have a better idea? See Question&Answers more detail:os...

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

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352 views

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c++ - What is gsl::multi_span to be used for?

The C++ core guidelines mention spans, not "multi-spans". But - I see that Microsoft's GSL implementation ... find any documentation on 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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318 views

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c++ - Usage limitations during the DllMain Attach and Detach process

One colleague of mine has troubles during the DllMain Detach process. His bug seems not to appear in all cases ... would deal with these issues. See Question&Answers more detail:os...

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

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266 views

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c++ - Strange pow(x, y); behaviour

While doing my homework I noticed something really strange that I just can't figure out why. int x = 5; cout << pow(x, 2 ... 3, 4, 6, 8, 12, 16. 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 it possible? std::vector<double> my_vec(sz); which is allocated but not initialized or filled

At [Value-Initialized Objects in C++11 and std::vector constructor, Channel72 asks, Question: Is my understanding ... the Great American Novel. See Question&Answers more detail:os...

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

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128 views

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c++ - Using std::conditional_variable to wait on a condition

For simplicity, let's assume that we have only one conditional variable to match a single condition that is ... bool gate_open; }; #endif See Question&Answers more detail:os...

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

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315 views

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c++ - gdb says "cannot open shared object file"

I have one binary and one shared library. The shared library is compiled with: all: g++ -g -shared -fpic $ ... parameter in gdb's command line. See Question&Answers more detail:os...

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

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289 views

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c++ - Adding #include <boost/thread/mutex.hpp> breaks my ActiveX control?

Is there a known problem with the boost::mutex header when used inside an ActiveX control? (Boost version v1.39 ... file that causes the issue. See Question&Answers more detail:os...

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

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