Recent questions tagged c++

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c++ - When is a divide by zero not a divide by zero? A puzzle in the debugger (static variable issues)

I'm very confused and I think my debugger is lying to me. I have the following loop in my code: MyClass:: ... ? I confess, I'm stumped.. 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++ - Unknown type name class

I have the following header files: https://gist.github.com/wemakeweb/5501443 and the compiler always reports " ... which was not linked properly See Question&Answers more detail:os...

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

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834 views

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c++ - Why std::function::argument_type has been deprecated?

I've seen on cppreference that std::function::argument_type was deprecated in C++17. What is the reason ... WG21 paper was proposing 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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c++ - Bignum libraries for windows?

Are there any bignum libraries that are good for Windows use? I looked at GMP, but unfortunately it does not ... and hashing routines) 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++ - Calculate total CPU usage

What is best algorithm for calculating total CPU usage at a particular time during execution of a process. I am working windows platform in 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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790 views

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c++ - Flushing of cout prior to reading input using cin .. why?

Why does cout has to be flushed before cin starts reading? Aren't they of different buffer? I can have reading ... buffers. I am confused here. See Question&Answers more detail:os...

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

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992 views

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c++ - How a draw a string in a splash screen by Xlib

here is my code and I can not jump out of the while(!done) function use XFlush(d) can show the display form ... / XCloseDisplay(d); 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++ - Encoding frames to video with ffmpeg

I am trying to encode a video in Unreal Engine 4 with C++. I have access to the ... function instead of avcodec_encode_video? 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++ - Messaging system: Callbacks can be anything

I'm trying to write an event system for my game. The callbacks that my event manager will store can be both ... ); void dispatchNextEvent(); }; 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++ - Using macro in Objective-C to log function name and line number

I have the following simplified code example: // in .h file // define a macro for partial method #define ... in my definition. Any suggestions? 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++ - Qt TabWidget Each tab Title Background Color

This is the original Tabwidget without setting title background color My customer ask me to do something like ... each QTabBar background color? See Question&Answers more detail:os...

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

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875 views

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c++ - Constructor finishes by throwing an exception ? Is there a memory leak?

I was going over this article and it states Note: if a constructor finishes by throwing an exception, the ... the update might have caused. See Question&Answers more detail:os...

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

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824 views

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c++ - Unable to save a float value to a bitfield structure

I have a structure struct { u32 var1 :7; u32 var2 :4; u32 var3 :4; u32 var4 :1; u32 var5 :4; u32 var6 ... help me how could i fix this problem? 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++ - Linking error "undefined reference" about boost static library during compiling

I am trying to compile my C++ project on Linux x64 with boost libraries 1.57. This project is compiled with ... What else could be the causes? 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++ - Files in directory with wildcard on Windows

how can I easy get all files paths from path containing a wildcards? For example: C:/Data*Set/Files*/*.txt and ... but I can't find 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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977 views

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c++ - Template matching from a screenshot of a window

What I've done I have a small template image which is meant to be used to find coordinates of matching ... main code: codeshare.io/vLio1 See Question&Answers more detail:os...

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

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878 views

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c++ - Why is my double or int value is always 0 after division?

I'm fairly new to C++ and I'm experiencing some strange behaviour from a percentage increase method I ... with returning decimal figures) See Question&Answers more detail:os...

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

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659 views

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c++ - How come pointer to a function be called without dereferencing?

I have a weird typedef statement in a C++ program, generated by Py++. double radius(int); // ... the prototype. Somebody please explain! See Question&Answers more detail:os...

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

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849 views

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c++ - What is run first inside a cout statement? (C++17)

Say for example I have a long statement like cout << findCurrent() << "," << findLowest() << "," ... before findLowest() like logic dictates? See Question&Answers more detail:os...

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

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859 views

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c++ static method output using cout is always 1

So i have a piece of code with a class like that: #include<iostream> #include<cstring> class stu { static int proba; ... ? How do I fix 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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958 views

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c++ - Adding two positive integers gives negative answer.Why?

#include<iostream> using namespace std; int main(){ int x = 1967513926; int y = 1540383426; cout<<x+y; ... Why wrong answer? Please help... See Question&Answers more detail:os...

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

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1.1k views

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c++ - BNF (with custom modification) Parser using Spirit

Using the bnf parser from here, I am trying add a field to be read as an attribute of List. So what I ... the number as an attribute of List. See Question&Answers more detail:os...

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

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940 views

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c++ - What is the maximum size of an vector<>::maxsize()?

Please specify the range of vector list .... I want to store million of records in vector<>. I have ... this possible in vector Regards, Karthik 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++ - Using offsetof() to get owner object from member variable

I would like to implement 'GetParent()' function in here- class ChildClass; class ParentClass { public: .... ChildClass ... , childObj) ); } }; See Question&Answers more detail:os...

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

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934 views

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c++ - Boost Spirit parser with inherited attributes - simple example won't compile

I'm trying to write a parser for a C-like language with boost::spirit that uses inherited attributes to transfer ... in advance for your help. See Question&Answers more detail:os...

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

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780 views

1 answer

c++ - QFile.write( myStruct ) - how?

I'm beginning with Qt and am stuck with a problem supposedly for quite a long time now. I'm sure it's ... write this struct to a QFile? 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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998 views

1 answer

c++ - Play sound on internal speakers and possibility to use old xp api function?

After the release of windows vista the Windows Function Beep plays a beep on your connected speakers instead of ... the windows xp platform. See Question&Answers more detail:os...

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

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1.4k views

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c++ - Global overload operator new/delete in MinGW

I want to overload new/delete operators in my application to catch all memory leaks. It works on Linux ... delete called, pointer = 0x003e3d68 See Question&Answers more detail:os...

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

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