Recent questions tagged C++

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c++ - switch "transfer of control bypasses initialization of:" when calling a function

I get a "transfer of control bypasses initialization of:" error when i try to build the following switch: switch ... for this kind of 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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c++ - Is there a reason why not to use link-time optimization (LTO)?

GCC, MSVC, LLVM, and probably other toolchains have support for link-time (whole program) optimization ... when compiling production software? 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++ - Qt "private slots:" what is this?

I understand how to use it, but the syntax of it bothers me. What is "private slots:" doing? I have never ... void setValue(int value); ... 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++ - Quick and dirty way to profile your code

What method do you use when you want to get performance data about specific code paths? 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 can you use CaptureStackBackTrace to capture the exception stack, not the calling stack?

I marked up the following code: #include "stdafx.h" #include <process.h> #include <iostream> #include <Windows ... application in Debug 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++ - Reading and writing to USB (HID) interrupt endpoints on Mac

I am attempting to communicate with a rather specific USB device and developing both Windows and Mac code to do so. ... work on 10.4 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++ - One way of eliminating C4251 warning when using stl-classes in the dll-interface

It is not a good practice using stl-classes in the dll-interface as Common practice in dealing with warning c4251: ... can do the same. 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++ - g++: In what order should static and dynamic libraries be linked?

Let's say we got a main executable called "my_app" and it uses several other libraries: 3 libraries are linked ... one, or the other way? 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++ - best way to do variant visitation with lambdas

I want to inline visitation of variant types with lambdas. At the moment i have the following code: struct Foo ... final version of this utility, including tests: lambda_visitor.h...

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

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c++ - Advice on Mocking System Calls

I have a class which calls getaddrinfo for DNS look ups. During testing I want to simulate various error ... Test for my unit testing. 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++ - implementing future::then() equivalent for asynchronous execution in c++11

I have a few questions about the implementation of the function then() in Herb Sutter's talk. This function is used to ... move(f), move(w)); } 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 - DLL missing, but it's not?

I am trying just a basic program with OpenCV with the following code: #include "cv.h" #include "highgui.h" ... cannot read at 0x3F8 libcv200.dll 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't I use strerror?

I'm porting some code to Windows, and the Microsoft compiler (Visual C++ 8) is telling me that strerror() is ... /or C++?" Thanks in advance See Question&Answers more detail:os...

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

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171 views

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c++ - Math to convert seconds since 1970 into date and vice versa

I have seconds since Jan 1 1970 00:00 as an int64 in nanoseconds and I'm trying to convert it into month/day ... 'm looking for the actual math. 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 optimization does move semantics provide if we already have RVO?

As far as I understand one of the purposes of adding move semantics is to optimize code by calling special ... what I'm understanding 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++ - error LNK2005: new and delete already defined in LIBCMTD.lib(new.obj)

I have a Visual studio 2005 solution that has two projects. One is a static library and the other is a ... linkage will be highly appreciated. 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++ - Avoid exponential grow of const references and rvalue references in constructor

I am coding some templated classes for a machine learning library, and I'm facing this issue a lot of times. I ... there some way to avoid 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++ - Reference to non-static member function must be called

I'm using C++ (not C++11). I need to make a pointer to a function inside a class. I try to do ... make a pointer to a member of MyClass? 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++ - Difference between InvalidateRect and RedrawWindow

When I want to redraw a window, is there any preferred function to call between InvalidateRect and RedrawWindow? For ... is no longer valid. 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++ - static vs non-static variables in namespace

I have a namespace foo which contains an integer bar, declared so... foo.h: namespace foo { int bar; } Now ... mean when used in a namespace? 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 you use keyword explicit to prevent automatic conversion of method parameters?

I know you can use C++ keyword 'explicit' for constructors of classes to prevent an automatic conversion of ... this new routine is developed. 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 can I store a lambda expression as a field of a class in C++11?

I'd like to create a class where the client can store a lambda expression like []() -> void {} as a field ... Does anyone know how to do 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++ - Avoid warning 'Unreferenced Formal Parameter'

I have a super class like this: class Parent { public: virtual void Function(int param); }; void Parent:: ... avoid the above warning? 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++ - How to set application icon in a Qt-based project?

How do you set application icon for application made using Qt? Is there some easy way? It's a qmake-based project. 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 point of std::unique_ptr::get

Doesn't std::unique_ptr::get defeat the purpose of having a unique_ptr in the first place? I would have expected ... of std::unique_ptr::get? 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++ - There are no arguments that depend on a template parameter

I am trying to do the following: template <class T> std::ifstream& operator>> (std::ifstream& fin, List<T> l) { ... : 1 errors, 0 warnings ===| See Question&Answers more detail:os...

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

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230 views

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c++ - Default inheritance access specifier

If I have for example two classes A and B, such that class B inherits A as follows: class B: public A In ... do you think about that? 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++ - "template<>" vs "template" without brackets - what's the difference?

Suppose I've declared: template <typename T> void foo(T& t); Now, what is the difference between template <> ... a C++ template to instantiate? See Question&Answers more detail:os...

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

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