Recent questions tagged C++

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c++ - Why does the = operator work on structs without having been defined?

Let's look at a simple example: struct some_struct { std::string str; int a, b, c; } some_struct abc, ... surprise when working on some 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++ - What does ## (double hash) do in a preprocessor directive?

#define DEFINE_STAT(Stat) struct FThreadSafeStaticStat<FStat_##Stat> StatPtr_##Stat; The above line is take from Unreal 4, ... don't understand. 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 anyone explain this algorithm for calculating large factorials?

i came across the following program for calculating large factorials(numbers as big as 100).. can anyone explain me the ... []a; 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++ - classes and static variables in shared libraries

I am trying to write something in c++ with an architecture like: App --> Core (.so) <-- Plugins (.so's) ... , "gamustardDLLStop"); 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++ - Cohabitation of boost::shared_ptr and std::shared_ptr

I want to use boost::log at some point, but I cannot pass a std::shared_ptr as a parameter, because the ... that states both are 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++ - `std::variant` vs. inheritance vs. other ways (performance)

I'm wondering about std::variant performance. When should I not use it? It seems like virtual functions are still ... static void Virtual(benchmark::State& state) { struct Base {...

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

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c++ - What is &&& operation in C

#include <stdio.h> volatile int i; int main() { int c; for (i = 0; i < 3; i++) { c = i &&& ... ] How is c being evaluated in the above 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++ - how to make an application thread safe?

I thought thread safe, in particular, means it must satisfy the need for multiple threads to access the same shared data ... to C/C++ language. 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++ - Explicitly exporting shared library functions in Linux

Is there a Linux equivalent of __declspec(dllexport) notation for explicitly exporting a function from a shared ... shared library 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++ - How to compile and execute from memory directly?

Is it possible to compile a C++ (or the like) program without generating the executable file but writing it and ... which might be read-only). 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 cost of passing by shared_ptr

I use std::tr1::shared_ptr extensively throughout my application. This includes passing objects in as function ... all for their advice. 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 practical uses of a protected constructor?

Why would anyone declare a constructor protected? I know that constructors are declared private for the purpose of ... their creation on stack. 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 deque and list STL containers?

What is the difference between the two? I mean the methods are all the same. So, for a user, they work identically. Is that correct?? 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 sort with a lambda?

sort(mMyClassVector.begin(), mMyClassVector.end(), [](const MyClass & a, const MyClass & b) { return a.mProperty > ... :myMethod, this, _1, _2). 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++ - Tag dispatch versus static methods on partially specialised classes

Suppose I want to write a generic function void f<T>(), which does one thing if T is a POD type and ... the other? Which would you recommend? 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 configure CLion IDE for Qt Framework?

How to configure CLion IDE for Qt Framework? Is this IDE compatible with Qt, or are there other IDEs ... something else than Qt Creator. 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++ - Constexpr vs macros

Where should I prefer using macros and where should I prefer constexpr? Aren't they basically the same? #define ... int max_height = 720; 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 does the template parameter of std::function work? (implementation)

In Bjarne Stroustrup's home page (C++11 FAQ): struct X { int foo(int); }; std::function<int(X*, ... to implement something like std::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++ - What is the difference between std::set and std::vector?

I am learning STL now. I read about set container. I have question when you want to use set? After ... for vector vs set containers. 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++ - const char* and char const* - are they the same?

From my understanding, const modifiers should be read from right to left. From that, I get that: const char* is ... my compiler(VS 2005) 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++ - GNU autotools: Debug/Release targets?

I've been looking for this for a while: I'm currently converting a medium-size program to autotools, ... that is unrecognized by configure 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: std::runtime_error vs std::exception()

What is the difference between std::runtime_error and std::exception? What is the appropriate use for each? Why ... in the first place? 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 return smart pointers (shared_ptr), by reference or by value?

Let's say I have a class with a method that returns a shared_ptr. What are the possible benefits and ... whenever possible? Thanks everybody. 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 async(launch::async) in C++11 make thread pools obsolete for avoiding expensive thread creation?

It is loosely related to this question: Are std::thread pooled in C++11?. Though the question differs, the ... control if you really need it. 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 point of STL Character Traits?

I notice that in my copy of the SGI STL reference, there is a page about Character Traits but I can't see ... are they ever used in practice? 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++ - Declaring an enum within a class

In the following code snippet, the Color enum is declared within the Car class in order to limit the scope of ... enum to we are referring.) 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++ - Fastest way to reset every value of std::vector<int> to 0

What's the fastest way to reset every value of a std::vector<int> to 0 and keeping the vectors initial size ? A for loop with the [] operator ? 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 role of glBindVertexArrays vs glBindBuffer and what is their relationship?

I'm new to OpenGL and Graphics Programming. I've been reading a textbook which has been really thorough and ... would be appreciated. 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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