Recent questions tagged c++

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c++ - Is auto an optional keyword in ranged based for loops?

I recall someone once telling me, "there is no need for auto inside range-based for loops. It would not be ... 't it also derive the type? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - g++ and clang++ different behaviour when `std::make_index_sequence` and `std::index_sequence` are used for a template parameter default type

Another "who's right between g++ and clang++?" question for C++ standard gurus. Given the following code ... struct foo; both compilers compile. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to check if an opencv window is closed

How do you check if an opencv window has been closed? I would like to do: cvNamedWindow("main", 1); ... no such cvWindowIsClosed(...) function! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is it possible to have a templated constructor like 'template<class T> X(){}'?

struct X{ template<class T> X(){} }; Is it possible to instantate such a type? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Constant Member Functions

After reading this, it is my understanding that declaring a method as const prevents it from accidentally ... t modify member variables? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How do I get the items selected from a QListView?

{ ... nrow = 10; ncol = 1; /*create QListView */ m_listView = new QListView(this); m_listView->setGeometry ... index and string per selection } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - C++11 template alias as template template argument leads to different type?

We have observed a strange behaviour in the compilation of the follwing source code: template<template<class> class TT> ... TT> struct X { }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - random_shuffle not really random

I'm using the random_shuffle on a vector like this: #include <algorithm> vector <Card> deck; //some code to add ... can I make it truly random? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the difference between overloading operator= and overloading the copy constructor?

What is the difference between overloading the operator = in a class and the copy constructor? In which context ... instead, as @Martin pointed. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::string x(x);

std::string x(x); This crashes very badly on my compiler. Does this mean I should test for this != &that ... no client will ever be so stupid? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Crash after m = XMMatrixIdentity() - alignment memory in classes?

I was looking at the tutorials in DirectX SDK. Tutorial 5 works fine, but after I have copied and ... there is no acceptable conversion) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is a statement void(); legal and what is it actually?

I have a little piece of code which has a statement void(); int main() { void( ); // 1: parses fine in ... one of those (and why of course) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is it undefined behavior to form a pointer range from a stack address?

Some C or C++ programmers are surprised to find out that even storing an invalid pointer is undefined behavior ... . Is this undefined behavior? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - converting -1 to unsigned types

Consider the following code to set all bits of x unsigned int x = -1; Is this portable ? It seems to work on at least Visual Studio 2005-2010 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to see macro expansions step-by-step?

It seems Eclipse allows user to "see the expansion Step-by-Step" by pressing F2. I like this awesome feature. ... have it launched all the time. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Debugging ncurses with Eclipse CDT

I'm writing a C++ application using ncurses in Eclipse CDT however I can't run/debug my app in eclipse because ... in eclipse? Thx in advance! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to uniform initialize map of unique_ptr?

I have this code to initialize map from into to unique_ptr. auto a = unique_ptr<A>(new A()); map<int ... (const unique_ptr&) = delete; ^ See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Default capacity of std::string?

When I create a std::string using the default constructor, is ANY memory allocated on the heap? I'm hoping ... following: std::string myString; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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c++ - Hide virtual function with non-virtual override

Having #include <iostream> using namespace std; class A { public: virtual void foo() { cout << "A" << endl; } }; ... and not (b->*&A::foo)() See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - LNK2022 Error When Using /clr

I'm having a problem linking a C++ project in VS2008 when using the /clr compile option. I am ... the attributes being defined backwards. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is typedef just a string replacement in code or somethings else?

I was curious to know how exactly typedef works. typedef struct example identifier; identifier x; In above ... do here? please enlighten! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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449 views

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c++ - Misunderstanding about ostream class and operator <<

After looking at the ostream::operator << c++ reference, I noticed the following declarations: ostream& ... operators not member functions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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457 views

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c++ - Strange error with a templated operator overload

When I compile the following snippet, I get a compiler error with clang, but not with g++/MSVC: #include <string ... is my mistake ? Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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369 views

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c++ - std::function not compiling in VS2012

I am trying to compile the following code taken from here but I am getting a compile error. Does anyone have any ... _Rx,_V0_t,_V1_t> *' Thanks. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can a non-type template parameter be of type "void*"?

Yakk - Adam Nevraumont said: Non-type template parameters of type void* are not allowed in at least some versions ... .type], including void*. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - how to use next_permutation

I'm trying to get an arrangement of tic tac toe boards. So I have the following code: // 5 turns for x if x ... What's a way I can do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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528 views

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c++ - different rand() results on Windows and Linux

I've noticed, that standard rand() function gives different results on Windows and Linux. Ofcourse I've used the same ... .1.2 on CentOS 5.5 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How do I remove the first occurrence of a value from a vector?

I'm trying to get a single element from a vector and push it to the back of the vector then remove it so ... occurance of a 3 from this vector? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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