Recent questions tagged C++

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c++ - Why I can access member functions even after the object was deleted?

I'm new to C++ and from what I learned so far when you call delete on a pointer that points to something ... to see what methods are out there) 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++ - Is there an intra-process local pipe in Qt?

Does Qt have a QIODevice pair that would work for intra-process point-to-point communications? One could use the ... the data through the OS. 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 compare two time stamp in format "Month Date hh:mm:ss" to check +ve or -ve value

I checked the stackoverflow site for my answer, i did not get, so i am posting it here. My problem is: How ... . For any help, 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++ - 2D Diamond (isometric) map editor - Textures extended infinitely?

I'm currently developing a 2D isometric map editor. I display entity(cube, player) which contains points and textures. ... mPoints; vector<int> mTextures; }; #include "entity.cpp"...

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

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c++ - Is a logical right shift by a power of 2 faster in AVR?

I would like to know if performing a logical right shift is faster when shifting by a power of 2 For example ... you that this does matter. 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++ - Setting ROI with mouse from a rectangle on a video

I have video, when the program is run the video's first frame is taken as an image and the user is allowed to ... ( "Example2" ); 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++ - Possible causes for Boost not being found by CMake in certain situations?

I build a C++ project depending on the Boost library using CMake (3.4.1). Host platform is Linux, targets are ... to find out what's going on. 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++ - Why is a constexpr function on a reference not constexpr?

Consider the following function: template <size_t S1, size_t S2> auto concatenate(std::array<uint8_t, S1> &data1, ... compile error out of 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++ template parameter type inference

I have such a template in C++ template<typename T, T* P> struct Ptr {}; so I can use it as such: const int ... ? I'm using Visual C++ 2013. 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 read a JSON file containing multiple root elements?

If I had a file whose contents looked like: {"one": 1} {"two": 2} I could simply parse each separate line as a ... "one":1 } { "two":2 } 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++ - Changing locale in Qt

I tried to change locale using QLocale and setDefault function but it seems that it doesn't work. Here is ... so it affects 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++ - Dereferencing deleted pointers always result in an Access Violation?

I have a very simple C++ code here: char *s = new char[100]; strcpy(s, "HELLO"); delete [] s; int n ... Is this kind of crash rare in real-life? 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++ - Initializer list for dynamic arrays?

It is possible to give an initializer list to the definition of a static array. Example: int main() { int ... someone knows a trick.. Best! 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++ - Convert string with explicit escape sequence into relative character

I need a function to convert "explicit" escape sequences into the relative non-printable character. Es: char str ... function that does 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++ - Conditional operator used in cout statement

By trying, I came to know that it is necessary to put parentheses around a conditional operator in a cout statement. ... both cases, isn't it? 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 does "#define STR(a) #a" do?

I'm reading the phoneME's source code. It's a FOSS JavaME implementation. It's written in C++, and I stumbled ... can find it with a CTRL+F. 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++ - Function-to-function-pointer "decay"

As we know a parameter that looks like void() will be rewritten as void(*)(). This is similar to array-to ... arguments to function func(42); ^ 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++ - "No appropriate default constructor available"--Why is the default constructor even called?

I've looked at a few other questions about this, but I don't see why a default constructor should even be ... float length; float halfLength; }; 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++ - Exception Error c0000005 in VC++

Am working on VC++ Console Application. This application sends a file from AppdataRoaming folder for a period of ... me to resolve this issue 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++ - Why is this constexpr static member function not seen as constexpr when called?

Why is this constexpr static member function, identified by the //! Nah comment, not seen as constexpr when called? ... 't make sense to me)? 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++ - checking data availability before calling std::getline

I would like to read some data from a stream I have using std::getline. Below a sample using the std::cin. std: ... getline( std::cin, line ); } 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 happens when you call data() on a std::vector<bool>?

C++11 has implemented data() member function on std::vector, which gives you a pointer to the memory array. ... expect from calling data() ? 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++ - Is there any difference between "T" and "const T" in template parameter?

Is there any difference between following 2 syntax: template<int N> struct A; // (1) and template<const int N> ... for when to use each syntax ? 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++ - Preventing a MEX file from crashing in MATLAB

I have a MEX file which I "borrowed" from someone else to help me code a semi-automated nuclear detection ... hundreds of dependencies :-(). 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 I use boost library for crossplatform application executing?

Is there any WinAPI WinExec analog in boost (c++) libraries? I need to run executable from my program, and ... OS my program is compiled for? 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++ - Impact of cubic and catmull splines on image

I am trying to implement some function like below For this I am trying to use Cubic interpolation and Catmull ... input); waitKey(); } 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 happened to the "aggregate or union type that includes one of the aforementioned types" strict aliasing rule?

Previously, in basic.lval, there was this bullet point: an aggregate or union type that includes one of the ... shed some light on 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 can I avoid including class implementation files?

Instead of doing #include "MyClass.cpp" I would like to do #include "MyClass.h" I've read online that not doing so is considered bad practice. See Question&Answers more detail:os...

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

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