Recent questions tagged C++

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c++ - What is the difference between a template class and a class template?

What is the difference between a template class and a class template? 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 inherit from std::exception?

I've seen at least one reliable source (a C++ class I took) recommend that application-specific exception ... inherit from std::exception? 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 should I use std::async?

I'm trying to explore all the options of the new C++11 standard in depth, while using std::async and reading ... an async, non blocking, 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++ - Why does this call the default constructor?

struct X { X() { std::cout << "X() "; } X(int) { std::cout << "X(int) "; } }; ... change to get a temporary instead of a variable declaration? 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 library debug symbols

In VS2010 there is an option to generate debug info for exes/dlls under linker but no such option under librarian for ... a user of my 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++ - Why is auto_ptr being deprecated?

I heard auto_ptr is being deprecated in C++11. What is the reason for this? Also I would like ... difference between auto_ptr and shared_ptr. 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 ALL virtual functions need to be implemented in derived classes?

This may seem like a simple question, but I can't find the answer anywhere else. Suppose I have the following ... that are pure virtual? 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++ - Extending python - to swig, not to swig or Cython

I found the bottleneck in my python code, played around with psycho etc. Then decided to write a c/c++ extension ... file or let swig do 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++ - Does making a struct volatile make all its members volatile?

If I have: struct whatever { int data; }; volatile whatever test; will test.data be volatile too? 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 convert from int to char*?

The only way I know is: #include <sstream> #include <string.h> using namespace std; int main() { int number ... any method with less typing ? 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 typedef a function pointer with the C++11 using syntax?

I'd like to write this typedef void (*FunctionPtr)(); using using. How would I do that? 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++ - Hooking DirectX EndScene from an injected DLL

I want to detour EndScene from an arbitrary DirectX 9 application to create a small overlay. As an ... inject it via CreateRemoteThread. 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::at vs. vector::operator[]

I know that at() is slower than [] because of its boundary checking, which is also discussed in similar questions ... + vector::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 VTT for a class?

Recently ran across a C++ linker error that was new to me. libfoo.so: undefined reference to `VTT for Foo' ... friendly can't find the 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 __declspec and when do I need to use it?

I have seen instances of __declspec in the code that I am reading. What is it? And when would I need to use this construct? See Question&Answers more detail:os...

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

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389 views

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c++ - #ifdef vs #if - which is better/safer as a method for enabling/disabling compilation of particular sections of code?

This may be a matter of style, but there's a bit of a divide in our dev team and I wondered if ... it could destroy other defines elsewhere. See Question&Answers more detail:os...

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

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What are the recommended parameters for CascadeClassifier::detectMultiScale() and depending on which factors I should ... maxSize=Size() ) 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 the priority queue STL for objects?

class Person { public: int age; }; I want to store objects of the class Person in a priority queue. ... > How does the greater 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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512 views

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c++ - Why can't I forward-declare a class in a namespace using double colons?

class Namespace::Class; Why do I have to do this?: namespace Namespace { class Class; } Using VC++ 8.0, ... result in an error at some point? 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 istringstream, ostringstream and stringstream? / Why not use stringstream in every case?

When would I use std::istringstream, std::ostringstream and std::stringstream and why shouldn't I just use std:: ... "; stHehe += "!"; See Question&Answers more detail:os...

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

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282 views

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c++ - Inserting into a vector at the front

iterator insert ( iterator position, const T& x ); Is the function declaration of the insert operator of the ... both be equally cheap/costly? See Question&Answers more detail:os...

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

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399 views

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c++ - How to run specific test cases in GoogleTest

I am trying to write a function/method for my project, which will ask to user which all test cases are you ... any solution. Please help me. 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 pass arguments and redirect stdin from a file to program run in gdb?

I usually run a program as : ./a.out arg1 arg2 <file I would like to debug it using gdb. I am aware of ... that only works from the gdb prompt. See Question&Answers more detail:os...

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

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266 views

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c++ - Why would anyone use set instead of unordered_set?

C++0x is introducing unordered_set which is available in boost and many other places. What I understand is that ... a need for set anymore? 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++ - Determine if map contains a value for a key?

What is the best way to determine if a STL map contains a value for a given key? #include <map> ... Does something along these lines exist? See Question&Answers more detail:os...

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

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260 views

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c++ - Which one will execute faster, if (flag==0) or if (0==flag)?

Interview question: Which one will execute faster, if (flag==0) or if (0==flag)? Why? See Question&Answers more detail:os...

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

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241 views

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c++ - Why is f(i = -1, i = -1) undefined behavior?

I was reading about order of evaluation violations, and they give an example that puzzles me. 1) If a side ... can run into trouble 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++ - In CMake, how can I test if the compiler is Clang?

We have a set of cross-platform CMake build scripts, and we support building with Visual C++ and GCC. We're ... C++ and GCC, respectively. See Question&Answers more detail:os...

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

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