Recent questions tagged C++

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I was given a piece of code that uses void() as an argument. The code doesn't compile... obviously? Can we ... bad code I've been given, right? 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++ - Json-cpp - how to initialize from string and get string value?

My code below crashes(Debug Error! R6010 abort() has been called). Can you help me? I'd also would like to know ... ; string c = obj.asString(); 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 (18446744073709551615 == -1) true?

When I was working on string::npos I noticed something and I couldn't find any explanation for it on the ... it because of binary conversation? 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++ - Erasing multiple objects from a std::vector?

Here is my issue, lets say I have a std::vector with ints in it. let's say it has 50,90,40,90,80,60 ... with an offset is not an option) 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++ - what are the fast algorithms to find duplicate elements in a collection and group them?

Say you have a collection of elements, how can you pick out those with duplicates and put them into each group with least ... .begin()); while(itr_begin != itr_end) { // fin...

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

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c++ - Boost.Log with CMake causing undefined reference error

I am trying to use the new Boost.Log library in a project I am working on. The project is built with ... v2s_mt_posix::trivial::logger::get()' 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 much do forward declarations affect compile time?

I am very interested in some studies or empirical data that shows a comparison of compilation times between two c ... you for any information. 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++ - Zero-Initialize array member in initialization list

I have a class with an array member that I would like to initialize to all zeros. class X { private: int m_array[ ... between the two in C++11? 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++ - inline in definition and declaration

During a recent peer review, another Software Engineer suggested that I state that the inline function is inline in ... So who is right 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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c++ - Efficient way of iterating over true bits in std::bitset?

Is there a way of iterating over a (possibly huge) std::bitset that is linear in the number of bits that are ... each bit that is set to true. 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 "Edit and continue" work in Visual Studio?

I have always found this to be a very useful feature in Visual Studio. For those who don't know about it, ... be smarter than this. Any ideas? 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++ - Best practices for writing a programming language parser

Are there any best practices that I should follow while writing a parser? 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 I prefer iterators over const_iterators?

Someone here recently brought up the article from Scott Meyers that says: Prefer iterators over const_iterators (pdf ... am I missing something? 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 should I use instead of sscanf?

I have a problem that sscanf solves (extracting things from a string). I don't like sscanf though since it's ... . What should I use instead? 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 does push_back or push_front invalidate a deque's iterators?

As the title asks. My understanding of a deque was that it allocated "blocks". I don't see how allocating more ... than a vector's, not less. 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 fill Matrix with zeros in OpenCV?

The code below causes an exception. Why? #include <opencv2/core/core.hpp> #include <iostream> using namespace cv ... I am providing 4 arguments. 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 C++0x's `noexcept` checked dynamically?

I am curious about the rationale behind noexcept in the C++0x FCD. throw(X) was deprecated, but noexcept ... functions within a try block. 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++ - "undefined reference" when linking against a static library

g++ (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5 I have the following static library called sdpAPI.a. I am ... ()' Many thanks for 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++ convert class to boolean

With all of the fundamental types of C++, one can simply query: if(varname) and the type is converted to a ... NULL in such a manner. 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++ - How do I get CMake to create a dll and its matching lib file?

I'm using CMake to create a shared library via Visual Studio 2010. The solution outputs a dll file, but not ... link other projects to the dll? 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++ - FFTW vs Matlab FFT

I posted this on matlab central but didn't get any responses so I figured I'd repost here. I recently wrote ... . I'm using R2011b. 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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297 views

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c++ - Can the structured bindings syntax be used in polymorphic lambdas

Structured bindings make it more clean and readable to iterate through a map with a range based for loop like ... when the function is called) 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++ - Display Different images per monitor directX 10

I am fairly new to DirectX 10 programming, and I have been trying to do the following with my limited skills (though ... NULL); } return true; } 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 ROI in OpenCV?

ROI can only be implemented with an rectangle. I however have a contour that I want to set as an ROI. ... questions. Just really confused :$ 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 capture output of printf?

I am calling a function funcB from funcA. funcB uses several printf statements to output data. Is there a way for me ... } funcA(){ funcB(); } See Question&Answers more detail:os...

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

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518 views

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c++ - How to convert QImage to opencv Mat

I have searched on the internet but I cannot find a method of converting a QImage(or QPixmap) to a OpenCV ... this?. Any help is 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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304 views

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c++ - Win32 Read/Write Lock Using Only Critical Sections

I have to implement a read/write lock in C++ using the Win32 api as part of a project at work. All of the ... ideas on how to go about 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++ - What's the difference between thread_posixs and thread_win32 in gcc port of Windows?

I wanted to download the latest available version of gcc 4.7.2 compiler for Windows. When I got to this ... impose a specific coding style? See Question&Answers more detail:os...

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

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