Recent questions tagged C++

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c++ - fatal error C1010 - "stdafx.h" in Visual Studio how can this be corrected?

I compile the following code but I get a compile error in Visual Studio that I cannot understand. #include < ... all your help in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - CMake is not able to find BOOST libraries

I tried everything like: Configure environment variable Make fresh build Re-install BOOST from source ... -DCMA-DRDK_BUILD_PYTHON_WRAPPERS= See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to use makefiles in Visual Studio?

I heard a lot about makefiles and how they simplify the compilation process. I'm using VS2008. Can somebody please ... how to deal with them? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Difference between passing array, fixed-sized array and base address of array as a function parameter

I am confused about which syntax to use if I want to pass an array of known or unknown size as a function ... of using each one of these? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calling a constructor to re-initialize object

is it possible to re-initialize an object of a class using its constructor? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can templates be used to access struct variables by name?

Let's suppose I have a struct like this: struct my_struct { int a; int b; } I have a function which should ... type, not one per variable... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Direct boost serialization to char array

Boost serialization doc's assert that the way to serialize/deserialize items is using a binary/text archive with ... oa << serializable_object; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - sqlite3_exec() Callback function clarification

I am having trouble understanding the use of the callback function in a SQLite3 database. I understand it is used to ... " "); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - best cross-platform method to get aligned memory

Here is the code I normally use to get aligned memory with Visual Studio and GCC inline void* aligned_malloc( ... the standard free / delete. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using OpenGL glutDisplayFunc within class

I've created a C++ class (myPixmap) to encapsulate the work performed by the OpenGL GLUT toolkit. The display ... main function of the program? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - glPixelStorei(GL_UNPACK_ALIGNMENT, 1) Disadvantages?

What are the disadvantages of always using alginment of 1? glPixelStorei(GL_UNPACK_ALIGNMENT, 1) glPixelStorei( ... on modern gpus? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Types of iterator : Output vs. Input vs. Forward vs. Random Access Iterator

How many types of iterators are there in C++ STL? As of now, I know of these: Output Iterator Input Iterator ... each? Which type is used when? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Overriding vs Virtual

What is the purpose of using the reserved word virtual in front of functions? If I want a child class to override a ... say() ? Thanks a bunch. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - "winapifamily.h: No such file or directory" when compiling SDL in Code::Blocks

I am following along with the SDL2.0 tutorials by LazyFoo, using Code::Blocks 13.12. I have had no trouble ... SDL_Quit(); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - When is a const reference better than pass-by-value in C++11?

I have some pre-C++11 code in which I use const references to pass large parameters like vector's a ... with const reference performance-wise. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to get a certain element in a list, given the position?

So I've got a list: list<Object> myList; myList.push_back(Object myObject); I'm not sure but I'm confident ... copy = myList.find_element(0); ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Google protocol buffers on iOS

Is the metasyntactic static library for iOS . . . http://code.google.com/p/metasyntactic/wiki/ProtocolBuffers . ... supplied by Google for iOS? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Equality-compare std::weak_ptr

I want to compare two std::weak_ptr's or one std::weak_ptr and one std::shared_ptr for equality. What I want ... access the objects in the set. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What's the deal with boost.asio and file i/o?

I've noticed that boost.asio has a lot of examples involving sockets, serial ports, and all sorts of non-file ... ? Whats the outlook for this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to capture stdout/stderr with googletest?

Is it possible to capture the stdout and stderr when using the googletest framework? For example, I would ... deliberately) produce an error. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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125 views

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c++ - What is the difference between ImageMagick and GraphicsMagick?

I've found myself evaluating both of these libs. Apart from what the GraphicsMagick comparison says, I see ... choosing between these libraries? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - signal and unlock order

void WorkHandler::addWork(Work* w){ printf("WorkHandler::insertWork Thread, insertWork locking "); lock(); printf( ... this? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How is LLVM isa<> implemented?

From http://llvm.org/docs/CodingStandards.html#ci_rtti_exceptions LLVM does make extensive use of a hand-rolled ... the others implemented? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Get a single line representation for multiple close by lines clustered together in opencv

I detected lines in an image and drew them in a separate image file in OpenCv C++ using HoughLinesP method. ... I had used in the question See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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156 views

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c++ - function template overloading

Can anybody summarize the idea of function template overloading? What matters, template parameter or function parameter? What ... , Z z) {} See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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222 views

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c++ - How to use the gcc installed in macports?

I installed gcc 4.6. from macports (for support of C++0x). But when I check the 'gcc --version` it ... use the newer gcc installed by macports? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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c++ - The proper way of forcing a 32-bit compile using CMake

Sorry that there are many similar questions, but I do find that Googling for CMake queries always yields similar ... very grateful! Many thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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154 views

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c++ - How to declare std::unique_ptr and what is the use of it?

I try to understand how std::unique_ptr works and for that I found this document. The author starts from the following ... in a "normal" way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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