Recent questions tagged C++

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c++ - How does SWIG wrap a map<string,string> in Python?

I'm using SWIG 2.0 to create a Python wrapper for a C++ library. One method has an argument of type "const ... actually wants me to pass for it. 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++ - When is the copy assignment operator called?

When I read about copy constructor and copy assignment constructor, what I understood is that both gives away their ... and has a meaning? 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++ - Binding functions with unique_ptr arguments to std::function<void()>

I'm trying to make the following code work: #include <cstdio> #include <functional> #include <string> #include <memory ... +11 fails too) flags. 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++ - OpenCV: VideoCapture::get(CV_CAP_PROP_FPS) returns 0 FPS

I am trying to get the fps from my camera so that I can pass it to the VideoWriter for outputting the ... works universally for all webcams? 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 make STL's priority_queue fixed-size

I am creating a simple game and I use std::priority_queue for giving commands to squads (every squad ... priority are automatically removed. 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++ - To throw or not to throw exceptions?

I was talking to a friend of mine that through my new code I didn't treat exceptions, just because I didn ... in "exceptional" situations? Why? 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++ - Observing weird behavior with 'auto' and std::minmax

I am using GCC 4.7.2 and Boost 1.58.0 on SUSE Enterprise Linux 11. I have the following code snippet which ... .second << endl; return 0; } 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++ - Trailing class template arguments not deduced

The code below fails to compile with gcc 7.1.0, which complains about providing the wrong number of template arguments in ... >(42); // Works } 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++ - Library ABI compatibility between versions of Visual Studio

I have two scenarios. Suppose I have 3 shared libraries that export C++ symbols, each built with VS7.1, ... the C library and exports classes. 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 call child method from a parent pointer?

I have a base class and a child class extending it. The child class has its own method inside that the parent ... is casting the way to go? See Question&Answers more detail:os...

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

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423 views

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c++ - Incomplete types in template code

Suppose we have two types (complete and incomplete): struct CompleteType{}; struct IncompleteType; Also we have template code: ... X(T) == T). 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++ - Why is this code 100 times slower in debug?

I'm using MSVC 2010. I'm trying to remove duplicate (without keeping any of them) from a list Why is this code 100 times ... = it2++; } } } } } 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++ a missing vtable error

I am getting a really weird error related to missing vtable for a given class constructor and destructor. Please help me to ... } A::~A() { } See Question&Answers more detail:os...

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

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304 views

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c++ - linker option to list libraries used

I am working on a Linux platform and using the GNU C++ compiler. I am trying to resolve a link error ... ' flag, I can troubleshoot further. See Question&Answers more detail:os...

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

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418 views

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c++ - Convert BSTR to char*

Anyone know how to convert BSTR to char* ? Update: I tried to do this, but don't know if it is right or ... URL->bstrVal); strcpy(testDest,p ); See Question&Answers more detail:os...

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

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601 views

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c++ - VS2012: 'nmake' is not recognized as an internal or external command

I tried VS2012 Native Tools, Cross Tools and Developers command prompt. And it does not recognize 'nmake'. It ... -libcurl-with-visual-c-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 align std::array contained data?

Since std::array does not allow changing its allocator, is there a way to ensure that the pointer to the data ... , 10>.data() = 0x7ffe42433450 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++ - Conversion of std::wstring to QString throws linker error

Hi I need to convert a std::wstring to QString and I tried the most obvious way of std::wstring wideString; ... I proceed to resolve this issue? See Question&Answers more detail:os...

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

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474 views

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c++ - How to make a c++11 std::unordered_set of std::weak_ptr

I have a set like this: set<weak_ptr<Node>, owner_less<weak_ptr<Node> > > setName; It works fine. But I would ... _Tp = std::weak_ptr<Node>]': 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++ - Why do people write private-field getters returning a non-const reference?

We can all agree on public variables being bad for encapsulation and all that. However, I noticed a lot of code ... . Why is this commonly used? See Question&Answers more detail:os...

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

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258 views

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c++ - Boost.Python custom exception class

I'm implementing a Python extension module using Boost.Python. The module should define its own custom exception classes ... How do I do that? See Question&Answers more detail:os...

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

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420 views

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c++ - Binary Serialization of std::bitset

std::bitset has a to_string() method for serializing as a char-based string of 1s and 0s. Obviously, this uses ... . How can I 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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358 views

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c++ - Is it acceptable not to deallocate memory

I'm working on a project that is supposed to be used from the command line with the following syntax: program-name ... C++? Do they work well? 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 search the computer for files and folders

i need a way to search the computer for files like Windows Explorer. i want my program to search lets say hard ... what files/folders are in it. 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 can you define const static std::string in header file?

I have a class that I would like to store a static std::string that is either truly const or effectively const via ... So how can this be done? See Question&Answers more detail:os...

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

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411 views

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c++ - Type trait for moveable types?

I'm trying to write a template that behaves one way if T has a move constructor, and another way if T ... have failed. Any help appreciated. See Question&Answers more detail:os...

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

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205 views

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c++ - The effect of `basic_streambuf::setbuf`

My problem is as follows: Martin York claims in this, this, and this answers that one can make a stringstream ... is intended to be used? See Question&Answers more detail:os...

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

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550 views

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c++ - Forward declaration of nested enum

I have code similar to the following: class B { } class A { enum { EOne, ETwo } EMyEnum; B myB; } I ... but for clarity I would prefer not to. See Question&Answers more detail:os...

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

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