Recent questions tagged C++

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c++ - Why am I able to make a function call using an invalid class pointer

In below code snippet, although pointer is not initialized the call is still made successfully temp *ptr; ptr->func2 ... crash here 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++ - How to debug in Codeblocks?

I just finished coding my program but am facing a few logic errors. I want to debug the program. I am using ... do this? Thanks for your help 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++ - Calling a random number generating member function doesn't produce entirely random numbers

I'm creating a wxWidget application with C++ where at the start of the program I want the application window ... = distribution(generator); } } 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 a default constructor required when storing in a map?

I'm getting the error: error: no matching function for call to 'A::A()' note: candidates are: A::A ... wants a constructor with no parameters. 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++ - Calculate a*a mod n without overflow

I need to calculate a*a mod n but a is fairly large, resulting in overflow when I square it. Doing ((a ... there's no pattern to these numbers. 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++ - Alpha rendering difference between OpenGL and WebGL

I'm rendering the same scene using the same exact C++ code, once to native OpenGL on windows and once ... can possibly cause this to happen? 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 am I allowed to do with a static, constexpr, in-class initialized data member?

This is probably a bit of an unusual question, in that it asks for a fuller explanation of a short answer ... you can in-class initialize 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++ - Uniform initialization fails to copy when object has no data members

In updating some code to use uniform initialization, I thought it would be a drop-in modern substitue for ... these should make a difference. 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 the initializer of std::function has to be CopyConstructible?

According to http://en.cppreference.com/w/cpp/utility/functional/function/function, the type of the ... to be just MoveConstructible? 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 infinite recursion leads to seg fault

Why infinite recursion leads to seg fault ? Why stack overflow leads to seg fault. I am looking for detailed explanation. ... main() { f(); } 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++ - Possible memory leak without a virtual destructor?

#include <iostream> using namespace std; class base { int a; public: base() {a =0;} }; class derv :public ... only base part of derv object?? 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++ - Application has failed to start because MSVCP100D.dll was not found, reinstalling app may work

I googled on this and realized there are probably several causes to this so I will describe my scenario. This ... side with Visual Studio 2008. 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++ - ptr->hello(); /* VERSUS */ (*ptr).hello();

I was learning about C++ pointers and the -> operator seemed strange to me. Instead of ptr->hello(); one ... case or is there any difference? See Question&Answers more detail:os...

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

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469 views

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c++ - Default Move Constructor in Visual Studio 2013 (Update 3)

I've been able to find multiple conversations about this in the past (e.g. here), but such ... default move constructors all-together. 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++ - Undefined reference to `stdscr' while using ncurses

I am trying to compile my code in Ubuntu 11.10 and getting these errors and more.So far by googling it ... : undefined reference to `wtouchln' See Question&Answers more detail:os...

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

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580 views

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c++ - How can CString be passed to format string %s?

class MyString { public: MyString(const std::wstring& s2) { s = s2; } operator LPCWSTR() const { return s ... , howmany, (LPCTSTR)kindOfFruit ); 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::vector capacity after copying

Does vector::operator= change vector capacity? If so, how? Does vector's copy constructor copy capacity? I ... . Is it implementation dependent? See Question&Answers more detail:os...

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

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561 views

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c++ - Comparing function pointers

How can I compare function pointers in C++? Is it stable? For example, would something like this be valid: if(pFnc == &myFnc){ //Do 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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672 views

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c++ - Get a reverse iterator from a forward iterator without knowing the value type

I'm trying to implement some STL-style sorting algorithms. The prototype for std::sort looks something like this (from ... ()); will not 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++ - Link errors using <filesystem> members in C++17

I'm using gcc 7.2 on Ubuntu 16.04, and I need to use the new filesystem library from C++17. Even though there ... > in C++17? 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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522 views

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c++ - Will automatic return type deduction work for main?

Will I be able to do the following for the main function in C++1y (C++14): auto main() { // ... } So ... 't need to use an explicit 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++ - Initialize base class with no default constructor in constructor of derived class

I'm trying to create a subclass secondary which could be used with a parameter as well as it's overriding class ... ~secondary() { //dtor } See Question&Answers more detail:os...

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

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528 views

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c++ - How to do static_assert with macros?

I have tried to use this suggestion to do a static assert, but I do not get a compilation error if I ... , if possible only with macros. See Question&Answers more detail:os...

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

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478 views

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c++ - mixing templates with polymorphism

class A { friend void foo(); virtual void print_Var() const{}; };// does not contain variable Var; template< ... not, how should it be designed? 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++ - Setting pointer to arbitrary dimension array?

When I want to initiate a multidimensional array, I usually just use pointers. For example, for two dimensions I ... of dimensions you'd like? See Question&Answers more detail:os...

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

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634 views

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c++ - boost::asio + std::future - Access violation after closing socket

I am writing a simple tcp client to send and receive single lines of text. The asynchronous operations are handled ... 4 (Visual Studio 2013) See Question&Answers more detail:os...

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

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420 views

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c++ - want to efficiently overcome mismatch between key types in a map in Boost.Interprocess shared memory

I'm creating a map (from string to string in this example) in shared memory using Boost.Interprocess. The ... the same two compiler errors. See Question&Answers more detail:os...

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

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439 views

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c++ - Constraining the existing Boost.Spirit real_parser (with a policy)

I want to parse a float, but not allow NaN values, so I generate a policy which inherits from the default policy and ... 2.5.2, with C++11) See Question&Answers more detail:os...

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

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