Recent questions tagged C++

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c++ - 64 bit floating point porting issues

I'm porting my application from 32 bit to 64 bit. Currently, the code compiles under both architectures, but the ... of which I was not aware. 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 time complexity of the following function?

int func(int n){ if(n==1) return 0; else return sqrt(n); } Where sqrt(n) is a C math.h library ... in a recent test that I appeared for. 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 setup GTK+ to develop with Code::Blocks on Ubuntu Linux

I am trying to develop a GTK+ application on Ubuntu 11.4, using Code::Blocks. www.gtk.org has ... I missing some installation step. 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++ - Something between __func__ and __PRETTY_FUNCTION__?

I work with g++ 4.8.1 and use these two macros for debugging. However, the __func__ macro gives me only the ... name. Any way to achieve 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++ - g++ doesn't compile constexpr function with assert in it

template<typename T> constexpr inline T getClamped(const T& mValue, const T& mMin, const T& mMax) { assert( ... the code without using macros? 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 `short-circuit evaluation` also available in `fold expressions`?

#include <type_traits> #define FORWARD(arg) std::forward<decltype(arg)>(arg) template<typename... Args> ... available in fold expressions? 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 char array inside union

I'm able to print the address and values of ints but not the chars of the union.Why is that so ... value } O/P:0x7fff5451ab68 0x7fff5451ab68 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++ - first n digits of an exponentiation

How do i determine the first n digits of an exponentiation (ab). eg: for a = 12, b = 13 & n = 4, the first 4 digits are 1069. 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++ - Split on substring

How would I split a string based on another substring in a simple way? e.g. split on " " message1 message2 => ... not what I mean by "simple". 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 does "%3d" mean in a printf statement?

In this code what is the role of the symbol %3d? I know that % means refer to a variable. This is the code: ... printf(" "); } 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++ - Trying to match two images using sift in OpenCv, but too many matches

I am trying to implement a program which will input two images one is an image of a box alone and one which ... in matlab that was quite good. 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++ - Template friend function of a template class

I was struggling with the issue described in this question (declaring a template function as a friend of a ... familiar with the standard. See Question&Answers more detail:os...

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

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445 views

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c++ - How to use QCoreApplication::postEvent to inject synthetic input events

I'm injecting Keyboard and Mouse events which are comming over the network into my Qt Application and use ... to track this myself? 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++ - Radial Tree layout algorithm

I have implemented a tree data structure in which every node holds (recursivly) a list of pointers to it's children ... what I'm looking for. 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 use shell magic to create a recursive etags using GNU etags?

The standard GNU etags does not support a recursive walk of directories as done by exuberant ctags -R. If I ... resolve the TAGS table entries. See Question&Answers more detail:os...

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

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367 views

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c++ - How to receive messages using a message-only window in a console application?

I've created a simple Win32 console application that creates a hidden message-only window and waits for ... can receive window messages? 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 How to embed an application into QT widget

In our project we have three independent applications, and we have to develop a QT control application that controls ... the right way? 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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533 views

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c++ - C++11 smart pointers and polymorphism

I'm rewriting an application using c++11 smart pointers. I have a base class: class A {}; And a derived class: ... A' has no member named b' 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 operator overload resolution work within namespaces?

I found a strange behaviour of C++ resolution of operator-overloading, I can't explain myself. A pointer to some ... the compiler doesn't find? 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++ - Pad array with zeros- openCV

How to pad an array(cv::Mat) with zeros in OpenCV? See Question&Answers more detail:os...

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

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225 views

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c++ - What does a constructor return?

My question is what does a constructor return? This question is not quite different from "What is the ... my wild interpretation correct? See Question&Answers more detail:os...

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

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186 views

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c++ - Elegant exceptionhandling in OpenMP

OpenMP forbids code which leaves the openmp block via exception. Therefore I'm looking for a nice way of getting ... what does it look like)? See Question&Answers more detail:os...

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

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355 views

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c++ - How to use _CrtDumpMemoryLeaks()

I am trying to use _CrtDumpMemoryLeaks() to display memory leaks in my program. But it does not display anything ... way of using this function. 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++ - Working with boost::asio::streambuf

Looking for a boost::asio (and with himself boost) decided to write asynchronous server. To store incoming data I ... (shared_from_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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312 views

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c++ - OpenCV example code for find contours: vector deallocation issue

I'm trying to get started with contour detection in OpenCV 2.4.2. To this end, I set up a project for ... but I couldn't reproduce the 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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404 views

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c++ - fastest way to write a bitstream on modern x86 hardware

What is the fastest way to write a bitstream on x86/x86-64? (codeword <= 32bit) by writing a bitstream I refer ... that may be of use? Cheers, See Question&Answers more detail:os...

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

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367 views

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c++ - Is there a generic way to adapt a function template to be a polymorphic function object?

I have some function templates, for example template <typename T> void foo(T); template <typename T> void ... something separately for each one? See Question&Answers more detail:os...

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

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345 views

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c++ - monitor a program's memory usage in Linux

Are there any tools available in Linux which graphically or textually display memory usage for a program? For example, ... to that in Linux. See Question&Answers more detail:os...

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

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