Recent questions tagged C++

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c++ - What are the disadvantages of using templates?

Some of the disadvantages would be its syntax is complex compiler generates extra code 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++ - Global keyboard hook with WH_KEYBOARD_LL and keybd_event (windows)

I am trying to write a simple global keyboard hook program to redirect some keys. For example, when the program is ... return(0); } Many 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++ - Getting hardware floating point with android NDK

I've begun playing with the android NDK. One of the things I've just learnt is about creating an application.mk ... of it :) Cheers 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++ - Avoiding "(Not Responding)" label in windows while processing lots of data in one lump

I occasionally need to process a large amount of data from one package off the network, which takes sufficiently long ... a C++ MFC application. 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++ - Difference between calling of virtual function and non virtual function?

This is in fact an interview question, I can't figure out the answer. Anyone knows about this? You can talk ... data that are push into stack. 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++ - Speed up float 5x5 matrix * vector multiplication with SSE

I need to run a matrix-vector multiplication 240000 times per second. The matrix is 5x5 and is always the ... you point out some references? 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 I set the platform toolset from the command line when building with VS2010's msbuild?

When I'm building a VS2010 with msbuild from the command line, can I change the platform toolset to v90 (i ... platform=%s", prjname, 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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c++ - How to increase the gcc executable stack size?

I have large Boost/Spirit metaprogram that is blowing gcc's stack when I try to compile it. How can I ... recursion to exhaust gcc's stack. 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 happens when a casted pointer has an increment operator?

For example: int x[100]; void *p; x[0] = 0x12345678; x[1] = 0xfacecafe; x[3] = 0xdeadbeef; p = x; ( ... error on the line with the ++ operator. 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++ - Should the assignment operator observe the assigned object's rvalueness?

For class types it is possible to assign to temporary objects which is actually not allowed for built-in types. Further, ... = GG(); // ERROR 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: std::thread inside a class executing a function member with thread initialisation in the constructor

I'm trying to use std::thread from C++11. I couldn't find anywhere if it is possible to have a std:: ... member function. Say &Runnable::run'| 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++ - Sorting non-type template parameter pack in C++11 or C++1y?

In C++11 and/or C++1y: Suppose I am given a template with a non-type parameter pack: template<int... ... efficient way (up to constant factors)? 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++ - GDB question: Pretty-Printing a 2D Array?

I have a 2d array matrix[10][10] that I'd like to inspect at debug time. I understand that I can do this in ... any way, lets say as a matrix? 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++ - Thread Specific Data vs Thread Local Storage

I've read Kerrisk's The Linux Programming Interface: A Linux and UNIX System Programming Handbook, Chapter 31 on ... using one or the other? 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++ - Boost Asio serial_port - need help with io

So I've been trying to learn the boost::asio stuff to communicate to a serial device using RS232. The ... io part of the serial_port. 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 how to find a list of connected components in a binary image

I am using OpenCV for a C++ application. I have a 8 bit binary image that has some objects. The objects ... what OpenCV functions to look into? 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++ - Inner angle between two lines

I have two lines: Line1 and Line2. Each line is defined by two points (P1L1(x1, y1), P2L1(x2, y2) and ... the outer angle or the inner angle! 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 does the standards committee indicate the status of a paper under consideration?

Does the C++ standards committee provide (on the open standard site or elsewhere) any indicatation of the status ... been accepted or rejected? 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 approach development of new Qt 5.7+ High-DPI Per Monitor DPI Aware application?

I have read the official Qt documentation and many articles and questions on StackOverflow about high DPI support in ... to get HighDPI apps? 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++ - Deleting array of pointers

Does delete[] a, where a is dynamic-allocated array of pointers, execute delete for each pointer in array? ... what's happening with pointers? 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 'a' and "a"?

I am learning C++ and have got a question that I cannot find the answer to. What is the difference between a char ... "a"; cout << '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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c++ - Writing and reading custom class to QSettings

I need to store instances of a custom class in the registry via QSettings. After reading from Qt's ... effectively store the values ? 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 errors when compiling code with OpenCV Libraries

I'm trying to compile a sample program after installing Opencv with the command: g++ hello-world.cpp -o hello ... anything I may have missed? 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++ - compile-time function for checking type equality

I need to implement self contained compile-time function for checking type equality (function template without arguments ... { return false; } 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++ - isn't non-type parameter pack that evaluates to "void..." illegal?

gcc-4.8 accepts this code, but isn't it wrong since the non-type parameter pack is equivalent to void... ... .org/bugs/show_bug.cgi?id=11723. 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++ - function try catch syntax and main

A little known, but almost never used C++ feature is given a declaration: void foo(); One possible, legal ... Is this legal and well defined? 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 a C++11 extension [-Wc++11-extensions]

I need some help understanding where this error is occurring: warning: in-class initialization of non-static data member is ... = 0; } Hand; 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 print out all elements in a std::stack or std::queue conveniently

If I do not to want to create a new container in order to do so? See Question&Answers more detail:os...

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

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