Recent questions tagged C++

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c++ - Make QtConcurrent::mapped work with lambdas

I am trying to use QtConcurrent::mapped into a QVector<QString>. I already tried a lot of methods, but it ... capturing variables in my code. 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++ - Cannot open include file 'thread'

I'm trying to use a threaded function for a parallel loop in a C++ program but I can't include <thread> ... Toolset which is set to v100) 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 create a interface for serialization in Boost Serialization?

I am newbie and I want to implement an interface to force users to implement the serialize method. This method is ... do what I want? Thank you 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 SFINAE apply to function bodies?

I have the following sample code: class Serializable {}; class MyData : public Serializable {}; void GetData( ... template won't be 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 I cause a compile error on "too few initializers"?

I am using an aggregate initializer to set up a block of static data for a unit test. I would like ... array initializers at compile-time? 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++ - GCC compiler warning flag for zero variadic macro arguments

What is the compiler warning flag for zero variadic macro arguments in GCC (I am using GCC 5.3.0)? The ... is in charge of this warning. 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 use the fmt library without getting "Undefined symbols for architecture x86_64"

I'm trying to use the fmt (https://github.com/fmtlib/fmt) formatting header library in my c++ project. ... . Any help would be appreciated! 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 icon in taskbar using windows api

I am writing a small windows application. I want to create a installer using nsis script. I know how to ... be appreciated. Thanks in advance 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++ - Need for _Bool in C99?

I am reading a book on C. It says that C99 added a data type _Bool. It is basically an int but stores only 0 ... printf("TRUE"); 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++ - Inline function prototype vs regular declaration vs prototype

What's the difference between inline function and then main like so: inline double cube(double side) { return side * ... side * side * side; } 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++ - OpenMP reduction with template type

template <typename T, std::size_t N> static T sum(const std::array<T, N>& a) { T result; // type ... the context of C++/OpenMP specifications. 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 the functionality of munmap, mmap

When I try to study some piece of code that deals with FPGA, I came across with munmap, mmap. I go ... this function. What exactly this does? 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++ - Qt - circles for collision detection

I've been working on a physics simulation with circles in Qt. Thus far the easiest way to define circles I ... ; painter->drawEllipse(rec); } 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 link ws2_32 in Clion

I am using Clion, which uses MinGW and Cmake. When I try to use the standalone asio library I am getting undefined ... can I 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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825 views

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c++ - Function dual to std::move?

Let's assume I have a class with only one constructor: class T { public: T(BigClass&& big) : big(std: ... above ? Edit: Some clarifications. 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++ - Icons disappear on an other computer

I've created a program with Qt Creator and compiled it with the release mode. I've added all the necessary DLLs and ... loaded in a qrc file... 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 a variable be defined only in the scope of an if-statement, similar to how it's often done for for-loops?

Is there a way to declare, assign and compare a variable to an expression in an if construction in such a ... condition of the if-statement? 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++ - Generic function to convert boost::any to boost::variant

Assume that you have a boost::any object and a boost::variant object. I'm looking for a generic function ... be impossible for some reason? 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 you use the standard GDB debugger with Qt executables?

I just started using Qt and I wanted to debug my Qt application. Can I use the standard GDB debugger with Qt executables? 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 clang missing default argument on parameter pack error?

When I use clang (10.0.1) to compile that: #include <iostream> template <typename ...Args> void f( int a = 4 ... I try it on gcc and works fine 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: set directory for target sources

I have a C++ project where all implementation source files (*.cpp) reside in a src directory ... with the target_include_directories 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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948 views

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c++ - how to imRotate with OpenCV 2.4.3?

how can i implement imrotate(Mat src,Mat dst,double angle) using OpenCV 2.4.3? there is a function warpAffine ... fill empty spots with black. See Question&Answers more detail:os...

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

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840 views

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c++ - Visual Studio not saving startup project and solution config

I've got a C++ solution that always forgets the solution config(debug vs release etc), and startup project ... about fixing this problem? 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++ - Boost::spirit::qi defining a calculator for nullaries

I'm trying to write a parser for math expressions where named variables are nullaries in boost::spirit (version ... define a rule like 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++ - GDB wrong values for vector.size()

A simple vector.push_back() causes some error in my code: #include <vector> using namespace std; int main(int argc, ... 12 (gdb) 19 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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889 views

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c++ - sizeof continues to return 4 instead of actual size

#include <iostream> using namespace std; int main() { cout << "Do you need to encrypt or decrypt?" << endl; ... way.) Thank you for your time. See Question&Answers more detail:os...

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

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707 views

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c++ - Should boost library be dependent on structure member alignments?

I found, the hard way, that at least boost::program_options is dependent of the compiler configured structure ... included in library naming? 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++ - If a virtual function is called from a constructor/destructor without qualification, does virtual dispatch occur?

struct A { virtual ~A() { f(); } virtual void f() {} }; I've edited my question to be more ... relevant section from C++ standard? 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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