Recent questions tagged C++

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c++ - Exception slicing - is this due to generated copy constructor?

I've just fixed a very subtle bug in our code, caused by slicing of an exception, and I now want to make ... confirmation of what was going on. 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++ - Clang VS VC++:"error: declaration of 'T' shadows template parameter"

I was trying to compile the following code for the classic copy&swap idiom on my Mac with clang 3.3 template< ... This works under clang too. 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 char*?

So I've been watching lectures from a University about C++, and I'm learning a lot, but one thing I still ... but maybe I'm just dead wrong. 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++ practical computational complexity of <cmath> SQRT()

What is the difference in CPU cycles (or, in essence, in 'speed') between x /= y; and #include <cmath> x = ... as a benchmark for x = sqrt(y) 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++ - Synchronizing STD cout output multi-thread

Latelly I've been working with multi-thread coding, after a while writing I realized that if I used std::cout in ... . Thank you for your time! 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/create boost::multi_index?

Can someone explain to me in detail how to create a multi index map using boost::multi_index? I saw many examples ... X and some are not unique. 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++ - Translating a std::tuple into a template parameter pack

I have a typedef std::tuple<A, B> TupleType; and would like to use the list of classes for a "template". ... failed "; } return res; } 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++ - With OpenCV, try to extract a region of a picture described by ArrayOfArrays

I am developing some image processing tools in iOS. Currently, I have a contour of features computed, which is ... do that? 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++ - Resolving RVA's for Import and Export tables within a PE file

I am currently writing a PE parser/loader. I have successfully loaded the PE file into memory using standard c ... sparse. 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++ - Higher color depth for MFC toolbar icons?

I was wondering how to make a toolbar in MFC that used 24bit or 256 colour bitmaps rather than the horrible 16 ... of some simple code? 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++ - Multithreading with Python and C api

I have a C++ program that uses the C api to use a Python library of mine. Both the Python library AND ... so please don't assume anything! 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++ - Problem in overriding malloc

I am trying to override malloc by doing this. #define malloc(X) my_malloc((X)) void* my_malloc(size_t size) { ... know how to do that? 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 can I search for a string in the memory of another process?

Currently I'm using this function which I've cobbled together from reading several loosely related questions all over the ... } } } } } 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++ - From quaternions to OpenGL rotations

I have an object which I want to rotate via keys. The object should yaw, pitch and roll. After trying a lot ... how to put the things together. 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++ - Compiling error cv::gpu

I'm using OpenCV master branch (3.0.0. dev) with CUDA on Ubuntu 12.04, and trying to compile the following ... API change in Opencv 3.0.0? 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++ - Does map move-insertion guarantee that elements are or are not moved from?

The standard "map" containers in C++ allow you to insert an rvalue: T x; std::map<int, T> m; // m[1] ... )); But is this guaranteed to not move? 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++ - Resumable assert/breakpoint on iOS like __debugbreak() with MS compiler

I'm trying to implement custom asset macro (similar to what assert.h has), but I want to be able to ... still allow me to continue execution? 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 can I compile Boost 1.54.0 (1.54) for the iOS simulator (6.1) on OS X 10.8.4?

I have successfully managed to compile several of the Boost libraries and create a framework for use with OS X, ... I'm even attempting 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++ - C++03 library with C++11 source code

If I have library that was written in C++03 and I compile it to a static library, can I then use it in ... compiler I am using is clang or LLVM 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 pass std::function with different parameters to same function

I have three functions I'm looking to merge together. Each one takes an std::function as the first ... suggestions would be greatly 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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c++ - Is it possible to do an inplace merge without temporary storage?

I was just thinking, if I were to implement std::inplace_merge it would probably look something like this: ... is supposed to come from? See Question&Answers more detail:os...

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

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252 views

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c++ - How do I find all the positions of a substring in a string?

I want to search a large string for all the locations of a string. 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 get class name?

If I defined a class: class Blah {}; How can I: std::string const className = /* What do I need to do ... ::className() to get the class name. 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 using NULL references OK?

I came across this code: void f(const std::string &s); And then a call: f( *((std::string*)NULL) ) ... what do you think of this construction? 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 storing unrelated data in the least-significant-bit of a pointer work reliably?

Let me just say up front that what I'm aware that what I'm about to propose is a mortal sin, ... supercomputers or anything exotic like 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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476 views

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c++ - Can I specialize a class template with an alias template?

Here's a simple example: class bar {}; template <typename> class foo {}; template <> using foo<int> = bar; Is this allowed? 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++ - Setprecision is Confusing

I just want to ask about setprecision because I'm a bit confused. here's the code: #include <iostream> ... wrong? please enlighten me. 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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260 views

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c++ - Policy with catching std::bad_alloc

So I use Qt a lot with my development and love it. The usual design pattern with Qt objects is to ... involving other scenarios as well. See Question&Answers more detail:os...

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

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