Recent questions tagged C++

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c++ - How does the standard library implement std::swap?

How is the swap function implemented in the STL? Is it as simple as this: template<typename T> void swap(T& t1 ... I use the std::swap 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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c++ - Common reasons for bugs in release version not present in debug mode

What are the typical reasons for bugs and abnormal program behavior that manifest themselves only in release compilation ... when 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++ - Is #pragma once part of the C++11 standard?

Traditionally, the standard and portable way to avoid multiple header inclusions in C++ was/is to use the ... -guard versus #pragma once). 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 are the differences between -std=c++11 and -std=gnu++11?

What are the differences between -std=c++11 and -std=gnu++11 as compilation parameter for gcc and clang? Same ... the other for a new 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++ - Is using #pragma warning push/pop the right way to temporarily alter warning level?

Once in a while it's difficult to write C++ code that wouldn't emit warnings at all. Having warnings ... better ways to achieve the same? 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++ - trivial vs. standard layout vs. POD

In layman's terms, what's the difference between trivial types, standard layout types and PODs? Specifically, ... without compiler magic?) 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++ - Inheritance: 'A' is an inaccessible base of 'B'

$ cat inheritance.cpp #include <iostream> using namespace std; class A { }; class B : private A { }; int ... in C++? Looks totally harmless. 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++ - Where do I find the definition of size_t?

I see variables defined with this type but I don't know where it comes from, nor what is its purpose. Why not ... "similar" types? Void_t, etc). 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 the Python interpreter statically?

I'm building a special-purpose embedded Python interpreter and want to avoid having dependencies on dynamic libraries so ... done in one step? 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++ - Are virtual destructors inherited?

If I have a base class with a virtual destructor. Has a derived class to declare a virtual destructor too? class ... or omit it if possible? 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 erase elements from STL containers?

How do I erase elements from STL containers, having a specified value, or satisfying some condition? Is ... different kinds of containers? 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 multi channel element access

I'm trying to learn how to use openCV's new c++ interface. How do I access elements of a multi channel ... in the old interface. Thank you 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++ - std::shared_ptr of this

I am currently trying to learn how to use smart pointers. However while doing some experiments I discovered the ... the std:: smart pointers? 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++ - CMake output/build directory

I'm pretty new to CMake, and read a few tutorials on how to use it, and wrote some complicated 50 lines of ... .../src Am I missing something? 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 I pass an std::function by const-reference?

Let's say I have a function which takes an std::function: void callFunction(std::function<void()> x) { ... ::function into a member variable. 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 is the difference between WM_QUIT, WM_CLOSE, and WM_DESTROY in a windows program?

I was wondering what the difference between the WM_QUIT, WM_CLOSE, and WM_DESTROY messages in a windows program, ... defined by the program? 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++ - do {...} while(false)

I was looking at some code by an individual and noticed he seems to have a pattern in his functions: < ... in a different language perhaps? 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 get the GL library/headers?

#include <glgl.h> #include <glglu.h> #include <glglaux.h> This is an example, but where to get GL headers? 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++ - Return a "NULL" object if search result not found

I'm pretty new to C++ so I tend to design with a lot of Java-isms while I'm learning. Anyway, in Java, ... so I can give that kind of marker? 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 make a multiple-read/single-write lock from more basic synchronization primitives?

We have found that we have several spots in our code where concurrent reads of data protected by a mutex are ... This is IA32, single-core. 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 any reason to use the 'auto' keyword in C++03?

Note this question was originally posted in 2009, before C++11 was ratified and before the meaning of the ... just existing for completeness? 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++ - Override compile flags for single files

I would like to use a global set of flags for compiling a project, meaning that at my top-level CMakeLists. ... not an elegant solution to 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++ - How to use SQLite in a multi-threaded application?

I'm developing an application with SQLite as the database, and am having a little trouble understanding how to go ... they've helped a lot. 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++ - Using Boost to read and write XML files

Is there any good way (and a simple way too) using Boost to read and write XML files? I can't seem to find any ... ? (it must be a C++ library) 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 or map, which one to use?

I've heard many people say that if the number of expected elements in the container is relatively small, ... compared to other implementations? See Question&Answers more detail:os...

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

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204 views

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c++ - Allow for Range-Based For with enum classes?

I have a recurrent chunk of code where I loop over all the members of an enum class. The for loop that I currently ... COLOR ) { // do work } 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 Code formatting for "{ }"

I'm on Ubuntu. C++ in Visual Studio Code automatically lints like if (condition == true) { DoStuff(); } ... /C++ extension from the marketplace. 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++ - Are static fields inherited?

When static members are inherited, are they static for the entire hierarchy, or just that class, i.e.: ... SomeClass and 1 for SomeDerivedClass? See Question&Answers more detail:os...

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

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