Recent questions tagged C++

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c++ - Global hotkey release (keyup)? (WIN32 API)

Is there a way to notice the release of a hot-key button registered with RegisterHotKey? I get a WM_HOTKEY ... know when the key was released 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++ - Using GetKeyState()

I would like to have a boolean event toggle when a key is pressed. Specifically, the 's' key. I have been pointed ... is 1, the key is toggled" 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++ - Vim: source code formatting

Take a look at the enum: enum TestEnum { First = 1, Second = 2, Unknown = 3, TestTestTest = 100, Zero ... YetAnotherFoo foo4; Bar bar; } 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++ - Non blocking getch()

I'm trying to make Tetris game in standard console. I need non-blocking getch(), so the blocks can fall ... pressed, otherwise the key 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++ - Deduce non-type template parameter

Is it possible to deduce a non-type template parameter from a template function parameter? Consider this simple ... fancy C++11 addition? 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 is a volatile local variable optimised differently from a volatile argument, and why does the optimiser generate a no-op loop from the latter?

Background This was inspired by this question/answer and ensuing discussion in the comments: Is the definition of ... according to the Standard? 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++ - Memory management in memory intensive application

If you are developing a memory intensive application in C++ on Windows, do you opt to write your own ... enough memory but is fragmented. 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 use std::enable_if in a conversion operator?

Basically I want my range type to be implicitly convertible from Range<const char> to Range<const unsigned char>. std:: ... >*>(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++ - Qt - Why add '&' to the string?

QPushButton *quitButton = new QPushButton("&Quit"); Why add a & to the Quit? Removing & and it seems the code behaves the same. 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++ - error: command 'C:\ Visual Studio\2017\Community\VC\Tools\MSVC\14.14.26428\bin\HostX86\x64\cl.exe' failed with exit status 2

Hi so I was trying to pip install python-ldap using my git bash but at first it told me that i don't have ... since it found it. Any insights ?? 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++ - Template specialization for enum

Is it possible to specialize a templatized method for enums? Something like (the invalid code below): template < ... an enum value will use? 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++ - std::call_once throws std::system_error (Unknown error -1)

I was using the C++ OpenCL wrapper and I was wondering why my program crashed. I discovered any call to std:: ... version 8.1.1 20180531 (GCC) 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 difference if we define friend function inside or outside of class

What is the difference between defining friend function inside the class or declaring inside and define outside of the ... member of the class. 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++ - At what exact moment is a local variable allocated storage?

Suppose we have the following: void print() { int a; // declaration a = 9; cout << a << endl ... reaches the declaration inside the 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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677 views

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c++ - MenuBar Not Showing for Simple QMainWindow Code, Qt Creator Mac OS

I have been having problems adding a menu item to the built in menu bar in a Qt desktop application. I copied ... in the top-most left corner. See Question&Answers more detail:os...

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

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300 views

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c++ - Initializing an std::array of non-default-constructible elements?

Suppose type foo_t with a named constructor idiom, make_foo(). Now, I want to have exactly 123 foo's - no more, ... ++17 if that helps at all. 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++ - Opening fstream with file with Unicode file name under Windows using non-MSVC compiler

I need to open a file as std::fstream (or actually any other std::ostream) when file name is "Unicode" ... with MSVC like extension for Windows? See Question&Answers more detail:os...

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

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334 views

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c++ - No implicit conversion in overloaded operator

d1 + 4 works but 4 + d1 doesn't even though 4 can be converted implicitly to a GMan. Why aren't they equivalent? struct ... + 4; d3 = 4 + d1; } 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++ - using a static const int in a struct/class

struct A { static const int a = 5; struct B { static const int b = a; }; }; int main() { return ... Can anyone explain why this is an exception? See Question&Answers more detail:os...

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

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151 views

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c++ - How do I replace a tuple element at compile time?

Is there a way to replace a tuple element at compile time? For example, using a_t = std::tuple<std::string, ... // std::tuple<char,double> See Question&Answers more detail:os...

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

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367 views

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c++ - Valgrind reports memory leak when assigning a value to a string

Valgrind reports a memory leak when assigning a value to a string. I used the following simple code to test ... reachable=yes [enzo@P0101222 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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151 views

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c++ - 'Invalid conversion from some_type** to const some_type**'

I've got a function that requires const some_type** as an argument (some_type is a struct, and the function ... convert a variable to const? See Question&Answers more detail:os...

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

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453 views

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c++ - Difference between 2.0 and 2.0f (explicit float vs double literals)

I had some questions about putting f next to literal values. I know it defines it as a float but do I really need ... than float a = 2.0f;? 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 static variables across files: namespace vs class

There are a lot of questions about static vs global here but I think my question is a bit different. I want to ... believe I am doing it wrong. See Question&Answers more detail:os...

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

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156 views

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c++ - How to "safely" delete folder into Recycle Bin

I'm looking for a way to put a folder (with subfolders) into a Recycle Bin with these conditions: It ... with a different calling convention. See Question&Answers more detail:os...

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

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307 views

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c++ - How to get Qt Creator to work with CDB?

I'm using Qt Creator 2.01 32-bit with Qt 4.7.1 on Windows 7 64-bit. I compiled my Qt library using ... which in turn loads and calls my DLL. See Question&Answers more detail:os...

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

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513 views

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c++ - How to convert an Array of pixels to HBITMAP

I have an array of pixels which I need to convert to HBITMAP in order to display it in a window. I tried to ... the problem and how to fix 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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139 views

1 answer

c++ - How to find the installation directory of a Qt application?

I have a Qt based application that works for both Mac and Windows. When the user installs the software it also ... be launched from a shortcut. See Question&Answers more detail:os...

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

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