Recent questions tagged C++

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c++ - Behavior of uninitialized local char?

If you have lets say a local int that is uninitialized, then its gets an undefined value but if you have a local ... )test1; //0 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++ - How Do I Parse a Date Time String That Includes Fractional Time?

I have a date time string: 20:48:01.469 UTC MAR 31 2016 I would like to convert this string representation of ... %Y"; strptime(str,fmt,&tmbuf); 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 Desktop Capture

How to capture the desktop in OpenCV (ie. turn a bitmap into a Mat)? Hello, Can anyone explain to me how ... noob. Thanks to anyone who answers. 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++ - Combining two const char* together

I've tried many ways to do that, I got a void which is static and is on Console class i made, Void it self ... for the thing I'm trying to do. 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++ - creating Mat with openCV in python

I am used to java's implementation of OpenCV. I want to create a Mat structure, fill data into it, extract ... found this link but it is broken 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++ - where does main() return its value?

I'm newly using CODE::BLOCKS+mingw compiler If I don't type return 0 at the end of program,I can see ... where does main() return its value? 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++ - Acces Matrix value without knowing the type opencv

I am writing a function in which I need to access to a element of a Mat, but this function can receive ... , Could someone give some light? 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++ - Run sudo command in Qt QProcess

I am developing a software in Qt in which I created a terminal. I run different commands through QProcess in that ... up widget or a text file? 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++ - Hyperlink navigation via Ctrl+click in Eclipse Oxygen does not work

After upgrading from Eclipse Neon to Oxygen I noticed that I can no longer navigate around the code by clicking on ... : What am I missing? 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++ - uniform initialization with variadic templates

I have a POD ChParam and it's a parameter in the variadic template function set. I'd like to pass to function ... 2000.f }); 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++ - cmake add_custom_command failure, target gets deleted

I am building a test executable using CMake. During the build process, I would like to run the executable, ... COMMAND $<TARGET_FILE:UnitTest>) 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++ - No member named 'forward' in namespace 'std'

In XCode, I recently made and tested a processing library that uses boost. I just set up a basic project in ... in the Target settings. DoH! 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++ - Wrong static const initialization that compiles and works

As far as I know, you can only initialize static const members in the same line of their declaration if ... switch those members to constexpr). See Question&Answers more detail:os...

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

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563 views

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c++ - cmake: linking against STATIC IMPORTED library fails

I have a vendor provided static library. I have added it as a STATIC IMPORTED library target, and set ... llimeTradingApi.a for my executable? 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++ - Does adding parentheses around a throw argument have any effect?

Is there a difference in writing: throw SomeException; and throw(SomeException); I have seen some sources that claim ... where I've seen 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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453 views

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c++ - How to extract mixed format using istringstream

Why does my program not output: 10 1.546 ,Apple 1 instead of 10 1 <empty space> here's my program: ... to do this would help me immense. 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 class declaration allowed after a class definition?

I just read this answer, and it completely puzzles me. I was always thinking a class declaration can appear many ... why is there a difference? 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 private static member be used as a default argument to a member function of its class?

Which one of the compilers is right ? class A { public: template <typename T> void fun(void (*f)() = funPrivate ... () {} ^ 1 error generated. 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++ - Deduce template argument for size of initializer list

I have the following (not compilable) code: template< size_t N > void foo( std::array<int, N> ) { / ... foo explicitly? Many thanks 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++ - Mutex lock/unlock order

I am interesting whether mutexes(not depending on particular language) must keep the order of lock/unlock? Here is ... only on 1st breakpoint. See Question&Answers more detail:os...

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

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506 views

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c++ - How can I store a boost::bind object as a class member?

I'm writing an application that uses boost::asio. Asio's async_receive (or async_read) is invariably shown using ... a bind object without auto. 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++ - Are there standard integer types with sizes being template parameters?

Suppose I need to make a template with a member of exactly N bits in length, where N is the template parameter. I ... in any version of C++? 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 safe to return std::wstring from a DLL?

According to some older StackOverflow questions ( Unable to pass std::wstring across DLL , C++ DLL returning pointer to ... DLL? Why or why not? See Question&Answers more detail:os...

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

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636 views

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c++ - typeid doesn't return correct type

cout << typeid(int&).name(); This, in my opinion, should return int& as a type, not an int, but on GCC 4. ... beta it returns int. Why is 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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c++ - a program to monitor a directory on Linux

There is a directory where a buddy adds new builds of a product. The listing looks like this $ ls path-to-dir ... an email using Mail or Email. See Question&Answers more detail:os...

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

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395 views

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c++ - Boost Graph accessing properties through vertex_descriptor

I have my custom vertex and edge properties namespace boost { enum vertex_diagonal_t{vertex_diagonal = ... vertex_descriptor or edge_descriptor See Question&Answers more detail:os...

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

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743 views

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c++ - POINTER_32 - what is it, and why?

I have just been given the task of updating a legacy application from 32-bit to 64-bit. While reviewing the extent ... + 2008, soon to be 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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421 views

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c++ - Convert "__m256 with random-bits" into float values of [0, 1] range

I have a __m256 value that holds random bits. I would like to to "interpret" it, to obtain ... varying precision at different magnitudes See Question&Answers more detail:os...

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

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