Recent questions tagged C++

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I'm trying to make a program that read the timer value from Minesweeper. (OS is windows 7 64bit) Using cheat engine I ... Sleep(1000); } } } } 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 point of unnamed non-type template parameters?

According to the reference, the name of a non-type template parameter is optional, even when assigning a default ... Why are the names optional? 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 end a Lua thread cleanly?

My situation is that I'm using the Lua (C) API to execute a script held in a string. I would ... Initialisation code luaL_dostring(L, 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++ - Does the multibyte-to-wide-string conversion function "mbstowcs", when passed a string literal, use the encoding of the source file?

ADDENDUM A tentative answer of my own appears at the bottom of the question. I am converting an archaic VC6 C+ ... for the compiler as for the C runtime implementation of mbstowcs...

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

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c++ - Perfectly capturing a perfect forwarder (universal reference) in a lambda

So I have a perfect forwarder, and I want to appropriately capture it in a lambda, such that R-values are copied ... was a better way. Cheers! 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 variadic macros or templates to implement a set of functions

I have a set of methods used to instanciate and initialize a set of objects. They all look pretty much ... same result without duplicating 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++ - Is shallow copy sufficient for structures with char[]?

I have a structure containing character arrays with no any other member functions. I am doing assignment operation ... this behavior is safe. 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++ - Make interchangeable class types via pointer casting only, without having to allocate any new objects?

UPDATE: I do appreciate "don't want that, want this instead" suggestions. They are useful, especially when ... not invoking undefined behavior. 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 QThread and moveToThread properly with QTimer and QTcpSocket

From reading this blog, this blog and some others, Subclassing QThread is bad practice. So I tried to apply this ... app. What should I do? 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++ - Multiple definition of a function error, even when using #if guard clauses

I am creating a simple UTIL.h file contain aplusb(int, int) function for my C++ project. However I cannot compile ... : *** [commonfunc] Error 1 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::bind with protected members & context

In the below code, there are two "equivalent" calls to std::for_each using boost:bind expressions. The ... than that calculated from Derived. 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++ - Overload resolution between template members in base and derived classes

Microsoft compiler (Visual Studio 2017 15.2) rejects the following code: #include <type_traits> struct B ... deduction/substitution failed: 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 it safe to push_back 'dynamically allocated object' to vector?

Whenever I need to add dynamically allocated object into a vector I've been doing that the following way: class Foo ... better way of doing 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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284 views

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c++ - Syscall overhead

How big is (approximately) an I/O syscall overhead on Linux from C program, I mean how bad is running ... )? App is strongly multithreaded. 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 it possible to reinterpret pointer as dimensioned array reference?

Suppose I have some pointer, which I want to reinterpret as static dimension array reference: double *p; double (&r)[4] ... so? how do I 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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531 views

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c++ - Compile other external libraries (without CMakeLists.txt) with CMake

short -- Is it possible to build a external binary/library out of a project with CMake, when the binary/library ... your help with this one... 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 to run an executable on Heroku from node, works locally

This is my first SE question. Usually I can find an answer to anything fairly easily through this great website, ... get over the final hurdle. See Question&Answers more detail:os...

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

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447 views

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c++ - CreateProcess with new console window, but override some std i/o handles

If you use CreateProcess with the flag CREATE_NEW_CONSOLE, the new process has its standard input, output, and ... a second console window. 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++ - Os X Yosemite Qt drag and drop file name bug

I was trying to use a simple drag and drop feature in my Qt app. Here is my code: MyWindow::MyWindow ... so looking for cross-platform solution. 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 reinterpret_cast type punning actually undefined behavior?

It appears to be widely-held that type punning via reinterpret_cast is somehow prohibited (properly: "undefined ... as the source glvalue. 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++ - Virtual function calling using dereference object

I have a base class pointer pointing to a derived class object. I am calling foo() function by using two different ... obj1.foo(); 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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359 views

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c++ - How to create an IconList property in the Windows Property System?

Currently, my property handler provides properties that can be displayed in Windows Explorer columns of type String. My ... > of type IconList? See Question&Answers more detail:os...

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

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351 views

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c++ - Compiling static TagLib 1.6.3 libraries for Windows

I am having a super hard time compiling and using TagLib 1.6.3 in my Qt project. I've tried everything I ... me some %!$#&ing libraries. 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++ - Direct State access with vertex buffers

Looking at this question from 2010, concerning vertex buffers in modern OpenGL, is it still the case that Direct State ... , texture and so on). 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++ - Speedup a short to float cast?

I have a short to float cast in C++ that is bottlenecking my code. The code translates from a hardware ... am using Visual Studios 2012... See Question&Answers more detail:os...

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

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226 views

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c++ - What could cause a deterministic process to generate floating point errors

Having already read this question I'm reasonably certain that a given process using floating point arithmatic ... Intel quadcore processor. See Question&Answers more detail:os...

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

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405 views

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c++ - Qt multiple key combo event

I'm using Qt 4.6 and I'd like to react to multi-key combos (e.g. Key_Q+Key_W) that are being ... keysequence is) strokes anymore. Thanks, Thomas 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 and ssl client server building issue on Linux

I have installed boost as a third library when I install pcl (Point Cloud Library). Now I am trying to run ... I do to solve this problem. See Question&Answers more detail:os...

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

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