Recent questions tagged C++

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c++ - Is it possible to create a CImageList with alpha blending transparency?

I would like to knwo if it is possible to create a CImageList with alpha blending transparency. Sample code that creates ... , RGB(255,0,255)); 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-Style upcast and downcast involving private inheritance

Consider the following piece of code :- class A {}; class B : private A {}; B* bPtr1 = new B; // ... guaranteed to be good? 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++ - Why favour data structure alignment?

The type of each member of the structure usually has a default alignment i.e.each structure member is ... alignment should be preserved? 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 shift elements inside STL container

I want to shift elements inside container on any positions to the left or right. The shifting elements are not ... elegant way to solve 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++ - libcurl output to variable instead of textfile

In failing to get curlpp for C++ working, I have decided to start using libcurl with C instead (for ... functions than most other languages? 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++ - About deque<T>'s extra indirection

Wondering why my memory accesses were somewhat slower than I expected, I finally figured out that the Visual C+ ... written/tested if possible. 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++ - Genuinely test std::atomic is lock-free or not

Since std::atomic::is_lock_free() may not genuinely reflect the reality [ref], I'm considering writing a genuine ... idea that could do 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++ - extern and extern "C" for variables

I'm writing a C++ shared library for a C program to use. However, I have a question about extern and ... use it for variables versus functions. 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++ - Boost.log: How to prevent the output will be duplicated to all added streams when it uses the add_file_log() function?

I use the add_file_log() function to initialize a logging sink that stores log records into a text file. ... by its associated logger. 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++ - Managing a singleton destructor

The following small example implements a singleton pattern that I've seen many times: #include <iostream> class ... keep the destructor private? 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 boost regex in gcc

i am trying to compile my program which uses regex on linux. I built the boost library in the libs/regex/build ... one should I link and why? 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 meaning of "Internal" in "!heap -h" output in windbg?

I am following this stackoverflow post What do the different columns in the "!heap -flt -s xxxx" windbg command ... - busy (1ff0) Internal 00000000032f85c0: 02020 . 02020 [10...

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

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c++ - Using STDIN with an AllocConsole()

I have a third-party dll that I load into software that isn't mine, and I'm using AllocConsole() to create the ... for me to give it some input. 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++ - MinGW compiled programs crash on 64 bit Windows

I have 32bit MinGW and 64 bit Eclipse CDT installed on 64 bit Windows 7 with an Intel Core i7-3612QM. When I ... line. How can I fix 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++ - Why do I get bad performance with SDL2 and SDL_RenderCopy inside a double for loop over all pixels?

I am programming a raycasting game using SDL2. When drawing the floor, I need to call SDL_RenderCopy pixelwise. ... SDL_RenderPresent(ren); } } 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++ - Win32 ::SetForegroundWindow() not working all the time

I'm working on a messenging tool. The messaging window is part of a whole application. I need the window ... it a known microsoft limitation. 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++ - overriding virtual function return type differs and is not covariant

Ah, SO came back just in time. I am getting a strange error: 'B::blah': overriding virtual function return ... Inner2 that has been cast up. 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++ - Dimension-independent loop over boost::multi_array?

Say I've got an N-dimensional boost::multi_array (of type int for simplicity), where N is known at compile ... an algorithm could look like? 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++ - trying to force static object initialization

I am trying to initialize a static object without success. The purpose is to automatically register a factory ... welcome. 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++ compile-time check function arguments

I'm searching a way to check function arguments in compile-time if it's possible to do for compiler. To be ... be resolved in way I suppose. 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 proper LLVM header guard style?

In clang tidy, the check [llvm-header-guard] looks for LLVM style header guards, but I can't find any ... pages does not mention 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++ - variadic templates parameter matching in std::function

I have the following code: #include <iostream> #include <functional> template<typename Return, typename... Params> ... desired. Any ideas why? 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++ - Templated copy-constructor fails with specific templated type

As some of my code required implicit conversion between matrices of different types (e.g. Matrix<int> to Matrix<double>), I ... (r, c)); } } } 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 elide a call if an edge condition is known at compile time?

I have the following situation: there's a huge set of templates like std::vector that will call memmove() ... should eliminate the memmove()? 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++ - Disabling stdout buffering of a forked process

I wrote a code in C/C++ which forks a child process, duplicates the stdin/stdout into a pipe ends and calls execvp ... { execute(); 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++ - Non-const declaration of array

I have been teaching myself programming for couple of years, and I was sure that if you need array declaration of a ... ? This is a safe method? 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++ - When is the file loaded into memory - for fread, fopen and fwrite calls?

When I do a fopen and then a fread, when is the file actually/partially loaded in the memory during fopen ... to file loading in memory? 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 combine two shorts to an int

I have two 16-bit shorts (s1 and s2), and I'm trying to combine them into a single 32-bit integer (i1). ... whether this is a good or bad idea? See Question&Answers more detail:os...

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

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