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I am a beginner in C++ development. My boss gave me a project and has helped me installed Visual Studio and VC++ build tool v143, so the project compiles. Now I wish to use some language features in C++20 in this project, such as std::format. Does Microsoft have a page […]

I got SDL to draw sprites and created a GameObject class that stores the relevant information to draw the sprite. However, whenever I try to draw multiple sprites to the screen it only draws the last one. Here's the code I'm using: #include #include #include #include #include #include #include using […]

I have following code with GCC8.3 ,x86-64 linux: // file: inc.cc int inc_value(int* x) { (*x)++; //std::atomic ww; //ww.load(std::memory_order_relaxed); (*x)++; return *x; } generates following assembly for increment operation: g++ -S inc.cc -o inc.s -O3 addl $2, %eax afther I enable the use of atomic variable, I got: addl $1, […]

I create a context menu by calling IContextMenu::QueryContextMenu. Everything is fine except for two things and both of these problems occur when displaying the context menu for the admin folder, which in my case is the current user. Assuming the admin username is "Admin", then the problem occurs when trying […]

I am working with the SQLite3 library in a C++ project and need to export the contents of an '.db' SQLite database into a plain text file. However, I want to avoid the common approach of iterating over each table and row manually and writing the output into the file. […]

I create a toolbar without using resource files, it is in the client area, I create another control at 0,0,300,100, it will be covered, how can I create a toolbar in the non-client area. I hope that the toolbar belongs to the non-client area, and the newly created button is […]

My implementation of Web-Push works fine with Chrome & Firefox, but not with MS edge (even after % decoding). Question: How to make it work? FYI, their URLs appear in different formats: Chrome URL: "https://fcm.googleapis.com/fcm/send/eBt-ioGXt4A:APA91bGkIsaIeVWAG-cU-UysXKl5pevjnZzIRT0GS69gx0ZKbnbrOD4FB7m8Ou8ZpS0X0hcEeSLjxYdsYKi896YibgFrocO7L8qDU2SeZfr6L7Pqc2DZ7A_82Qik7PINAF_S2rskKofe" Edge URL: "https://wns2-pn1p.notify.windows.com/w/?token=BQYAAACbMWA0QtGcCaM00KJntpBBrdmzSvWUnBmgRwUFnM6fJEySP1Jr0Fi3OU2rgTICDfl2Bsj6jS4eNZLo0FQK1diyqN1v6zi7k9yBijIksEvKegd2q2Z%2bGAIoIt0QfnQyluOGSNgXCrF0jr4h3Ka5aJUVdl7aBSkkULq5PI7wvGl3mGMD9I3xk71jG%2bjBAwoF2ThvYfefEEpd5xMAJ%2bWLBd3FD56kD1zTplOhwS4Leysw3SFBXh393%2b8MfDFJCAi%2f0mfKLBy%2fTCuha50GJT7oBJHemhFCi5E2CliZ9dFB2IPCpEa%2bEfgVWHC6GkpRMjUSCs0%3d" Error printed at the client side: 400: "Error transferring -server replied: " […]

In the following code, a SomeClass object is scoped inside a block but a reference to it is stored in p in an outer block. And later using p, SomeMethod() of SomeClass is called. SomeClass TestMethod(SomeClass c) { SomeClass * p; { SomeClass t = new SomeClass(); p = &t; […]

As a coding exercise I was told to implement a function that writes a file out backwards. This was my attempt assuming the file only included ASCII characters: void reverse_file(const std::filesystem::path& input_file, const std::filesystem::path& out_file) { std::ifstream ifs{ input_file }; ifs.exceptions(std::ifstream::badbit); std::ofstream ofs{out_file}; ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit); // moves one to […]

C++23 allows to define a lambda as static. i.e. If a lambda captures nothing, then it can be defined as static: // with superfluous argument `this`, less efficient. auto fn1 = [](int a, int b) { return a + b; }; // no argument `this`, more efficient! auto fn2 = […]