Recent questions tagged C++

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c++ - Is C++20 'char8_t' the same as our old 'char'?

In the CPP reference documentation, I noticed for char The character types are large enough to represent any UTF- ... have some other feature? 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++ - Nullptr and checking if a pointer points to a valid object

In a couple of my older code projects when I had never heard of smart pointers, whenever I needed to check ... you could mess up your 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++ - Unknown type name 'class'; did you mean 'Class'?

I'm trying to implement AQRecorder.h class from SpeakHere Apple Xcode project example, but even I rename my ... Any help will be 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++ - Force the compiler to ignore some lines in the program

Suppose that I have 10,000 lines of C++ code. 200 lines of this code are for testing purpose (for ... code (maybe with preprocessor keywords)? 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++ - Cleanest way to copy a constant size array in c++11

I often find myself wanting to copy the contents of arrays that have a constant size, I usually just write ... macro or a template 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++ - How to convert errno to exception using <system_error>

I read a thoughtful series of blog posts about the new <system_error> header in C++11. It says that the ... ARM processor, if that matters. 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++ - Enum variable default value?

The question is simple: #include <iostream> enum SomeEnum { EValue1 = 1, EValue2 = 4 }; int main() { ... inherited code doesn't have 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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c++ - Is there any way to make Visual Studio stop indenting namespaces?

Visual Studio keeps trying to indent the code inside namespaces. For example: namespace Foo { void Bar(); ... modifies devenv.exe directly. 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++ - Two decimal places using printf( )

I'm trying to write a number to two decimal places using printf() as follows: #include <cstdio> int main() { ... -0.000000 Why is 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 to Skin an Win32 Application

Win32 look nasty, how to make it look better by custom skins? I mean something like Adobe products, iTunes, ... Rodríguez comment, down there ↓↓ 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 create nested Lua tables using the C API

I want to create a table like myTable = { [0] = { ["a"] = 4, ["b"] = 2 }, [1] = { ["a"] ... how can I save the inner tables to the outer table? 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 FFTW++ working on windows? (for dummies)

I'm using Windows 10 and Visual Studio 2015. In C++, I need to get the Fourier-transform of an image for ... t find any tutorial-like on Google. 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++ - Passing rvalue reference to const lvalue reference paremeter

I am trying to understand C++11 rvalue references and how to use them for optimal performance in my code ... there any specification 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++ - Linking to multiple .obj for unit testing a console application

Having a few issues and hope I can find some help. I have two projects under the same solution in Visual ... there an option I am missing? 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++ - Implementation of a "hits in last [second/minute/hour]" data structure

I think this is a fairly common question but I can't seem to find answer by googling around (maybe there's a ... hits; int last_count = 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++ - Sharing memory between modules

I was wondering how to share some memory between different program modules - lets say, I have a main ... the newly created manager object. 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++ - Iterate Over Struct; Easily Display Struct Fields And Values In a RichEdit Box

Is there an easier way to display the struct fields and their corresponding values in RichEdit control? This is ... into the struct already. 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++ - OpenGL ES Texture Coordinates Slightly Off

I'm trying to draw a subregion of a texture in OpenGL by specifying the coordinates I want. What's happening though is ... , 0, data[0].t); 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 decode huffman code quickly?

I have implementated a simple compressor using pure huffman code under Windows.But I do not know much about how to ... ,3MB within 6s. 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++ - "type-switch" construct in C++11

All the time, I find myself doing something like this: Animal *animal = ... if (Cat *cat = dynamic_cast<Cat * ... so I'll share my answer below. 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 Opencv GPU code is slower than CPU?

I'm using opencv242 + VS2010 by a notebook. I tried to do some simple test of the GPU block in OpenCV, but it ... (); getchar(); 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++ - One-liner for RAII on non pointer?

Related topic std::unique_ptr, deleters and the Win32 API To use a Win32 Handle as a RAII, I can use ... (AF_UNSPEC, SOCK_STREAM, IPPROTO_UDP)); 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++ - H.264 muxed to MP4 using libavformat not playing back

I am trying to mux H.264 data into a MP4 file. There appear to be no errors in saving this H.264 ... ); DateTime dt = block->getTimestampAsDateTime(); switch (block->getPacketTyp...

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

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c++ - glm rotate usage in Opengl

I am rendering a cone, and I would like to rotate it, 90 degrees anti-clockwise, so that the pointy end faces ... ? with "glm rotate" 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++ - How to see memory layout of my program in C during run-time?

I would like to see Memory layout of my program in C so that i can understand all the different segments of the ... in BSS or Heap for ex ? See Question&Answers more detail:os...

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

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440 views

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c++ - cin.ignore(numeric_limits<streamsize>::max(), ' '); max() not recognize it

I'm taking an intro to C++, and I'm using VStudio 2013 on Win7. I try to avoid the wrong data input from my ... to fix it. Can anybody help me? 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 templates and polymorphism

Hi all I have a doubt regarding templates and polymorphism. By definition polymorphism provides code reusability, and ... the exact difference. 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 differences between member initializer list and default member initializer on non-static data member?

I'd like to understand what's the differences of using one form rather than the other (if any). Code 1 ( ... semantics, or it is just syntactic? See Question&Answers more detail:os...

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

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