Recent questions tagged C++

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Installed just the IDE on Windows 7. I want to create a Plain C++ Project (Non-QT Project); however I get ... that and just use the IDE? 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 image loading for OpenGL Texture

I want to load an image (jpg and png) with OpenCV as OpenGL Texture. Here is how I load the image to OpenGL: ... and tell me why is stays black? 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++ - Compile time template instantiation check

Is it possible to check if a template type has been instantiated at compile time so that I can use this ... is instantiated at compile time? 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++ - Brute-force, single-threaded prime factorization

Up for consideration is the following function which can be used to (relatively quickly) factor a 64-bit unsigned ... the bottom, as well. 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's the difference between while(cin) and while(cin >> num)

What the difference between the following two loops and When each one will stopped ? #include<iostream> #include<algorithm> ... } 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++ stack trace from unhandled exception?

This question has been asked before and there have been windows-specific answers but no satisfactory gcc answer. I ... to examine a core file? 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++ - Getting the current time (in milliseconds) from the system clock in Windows?

How can you obtain the system clock's current time of day (in milliseconds) in C++? This is a windows specific app. 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++ - Why is the data type needed in pointer declarations?

As far as I know about data types in C/C++, while declaring a variable, we need to declare its ... Is my understanding about pointers wrong? 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 enable_shared_from_this of both parent and derived

I have simple base and derived class that I want both have shared_from_this(). This simple solution: class foo ... both parent and child? Thanks 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++ - The std::transform-like function that returns transformed container

I'm trying to implement a function similar to std::transform algorithm but instead of taking the output ... any compatible container type? 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++ - Purpose of Explicit Default Constructors

I recently noticed a class in C++0x that calls for an explicit default constructor. However, I'm failing to ... but the default constructor is. 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++ - Stringify template arguments

Is it possible in C++ to stringify template arguments? I tried this: #include <iostream> #define STRINGIFY(x) #x ... ? (Compiler is VC++). 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 do I write an ADL-enabled trailing return type, or noexcept specification?

Imagine I'm writing some container template or something. And the time comes to specialize std::swap for it. As a ... . How do I handle 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++ - Why can some operators only be overloaded as member functions, other as friend functions and the rest of them as both?

Why can some operators only be overloaded as member functions, other as non-member "free" functions and the rest of ... member, free, or both)? 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 search for an element in an stl list?

Is there a find() function for list as there was in vector? Is there a way to do that in list? 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++ - Getting a bunch of crosses initialization error

I have this snippets of code taken from a downloaded example: bool ChatServer::event(QEvent * event) { if(event- ... to other lines of code. 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++ - Correct way to inherit from std::exception

I've just created exception hierarchy and wanted to pass char* to constructor of one of my derived classes with ... "Something bad happened."); 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++ - Why do (only) some compilers use the same address for identical string literals?

https://godbolt.org/z/cyBiWY I can see two 'some' literals in assembler code generated by MSVC, but only one with ... const char B[] = "some"; 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++ - Overloading on R-value references and code duplication

Consider the following: struct vec { int v[3]; vec() : v() {}; vec(int x, int y, int z) : v{x ... . Can I achieve the same with less repetition? 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++ - Visual Studio Project out of date

I've been trying to get Visual C++ working, but I'm getting this error when building every project: "This ... feel that this is the error. 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++ - Virtual Webcam Driver

I want to develop a virtual webcam driver which from User mode I'll pass image to it and it will display ... which is DirectShow, not driver 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++ - Why define operator + or += outside a class, and how to do it properly?

I am a bit confused about the differences between Type operator + (const Type &type); Type &operator += (const ... when should either be used? 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++ - Correct usage of the Eigen::Ref<> class

Eigen has introduced the Ref<> class to write functions with Eigen objects as parameters without the use ... usage and the reference. 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 ScopeGuard use really lead to better code?

I came across this article written by Andrei Alexandrescu and Petru Marginean many years ago, which presents and ... in actual production code? 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++ - Command line compile using cl.exe?

Am trying to use the Visual Studio Express 2010 C++ compiler without using the IDE. I found cl.exe in C: ... to be inside bin folder. Thanks. 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++ - Why is istream/ostream slow

At 50:40 of http://channel9.msdn.com/Events/GoingNative/2013/Writing-Quick-Code-in-Cpp-Quickly Andrei ... equally satisfied the needs. 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 find the Qt5 CMake module on Windows

I'm trying to make a very basic Qt5 application using CMake on Windows. I used the documentation of Qt5 to use ... ! Do you have any 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++ - How to install TensorFlow on Windows?

I am starting to work with TensorFlow library for deep learning, https://www.tensorflow.org/. I found a ... for Windows for production use? See Question&Answers more detail:os...

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

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