Recent questions tagged C++

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c++ - Why the error of - calling the function before being declared, is not shown?

main() { f(); } int f( int i, float fl) { printf("function"); } Why does the above code runs successfully ... float fl) { printf("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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c++ - After using 'delete this' in a member function I am able to access other member functions. Why?

I just wrote a sample program to see the behaviour of delete this class A { ~A() {cout << "In destructor ... using linux ubuntu and g++ compiler 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 a way to define a variadic number of arguments of the same type?

I can't figure out how to implement a function with a variable number of arguments of the same type. I'm writing for ... ,1,2,7,4>(mode,speed); 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++ - same address shows different values for const variable with g++ compiler

The following code shows different output with gcc and g++ on using const variable i. The addresses of i and value of ... ,i,*ptr); 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++ - Is there anything wrong with sizeof(array)/sizeof(array[0])?

One of my colleagues has recently said that the above statement is not type safe and I should use ... fancy array initialisation. techniques. 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++ - Calling destructor with decltype andor std::remove_reference

Is it possible to call destructor(without operator delete) using decltype andor std::remove_reference? Here's an example: ... t work 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++ - QT https SSL support for static QT static program build - getting 'Protocol "https" is unknown'

Hi I am trying to compile a QT program I made for Windows statically and keep getting the error Protocol " ... necessary. Any ideas? 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++ - Checking at compile time if specified value is in a range of a type

Is it possible to check this: template<class IntType,IntType value> struct X{}; What I mean by this is, is it ... to be able to detect that. 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 does this & operator mean here?

I was reading some tutorial about openGL in qt. One of the mouse event slot has this code in it: if (event-> ... it exactly the same as == ? 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++ - nlohmann's json library convert an array to a vector of structs

Say I have a json array that looks like this: [ { "Name": "test", "Val": "test_val" }, { "Name": " ... do not know how to apply that to 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++ - Wrong understanding of 'if constexpr'

I have following code static constexpr bool condition = true; int square(int num) { if constexpr (condition) { ... this? Thanks for the help 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++ - Strange VC++ compile error, C2244

Take a look at this peice of code: template <typename K,typename T> Pointer<typename Collection<T>::Iterator> ... relevant for 2008 as well. 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++ - Implement Resize option to Qt Frameless widget

How can i implement resize option to Qt frameless widget that it's used as Main 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++ - How to resize QWidget added in QGraphicScene through QGraphicsProxy?

I have added a widget to a graphic scene (QGraphicScene) through a QGraphicsProxyWidget. To move and select the ... : Before Resize After Resize 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++ - Android NDK linking V8 static library: cannot find symbols, but they are there

I've been pulling my hair out over this one. I am developing on Ubuntu 12.04 64-bit. I created a native ... is failing to pick up the symbols? 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 make a threaded network server in Qt?

I'm working on a threaded telnet server (one thread per connection), and can't figure out how to get rid of ... is the RIGHT way to 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++ - Does an aborted xbegin transaction restore the stack context that existed at the xbegin start?

I am interested in encapsulating a transactional xbegin and xend inside XBEGIN( ) and XEND( ) functions, in a static ... use _asm { } inlining. 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 specialize std::hash for type from other library

So the library I use has an enum (say it's named LibEnum). I need to have an std::unordered_set of LibEnum ... //how should it 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++ - Benchmarking affected by VCL

Today I ported my old memory benchmark from Borland C++ builder 5.0 to BDS2006 Turbo C++ and found out ... Windows7 pro x64, 32bit Application 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 read file which contains uxxxx in vc++

I have txt file whose contents are: ... Question&Answers more detail:os...

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

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c++ - Object created in for-loop has same address

I'm trying to make an own list-class which is of a fixed size and can store integers. Just for learning ... List() has a separate address? See Question&Answers more detail:os...

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

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198 views

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c++ - STATUS_ACCESS_VIOLATION when reading file int struct

I am reading 3 things into a struct Songs: songtitle, artist, size of file. I am getting a error when i run ... reading the file into a struct? 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 string to pass filename to fstream

I am using the following method to read a txt file modelStream.open("file.txt", ios::in); if (modelStream.fail()) ... it is how would 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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c++ - Most terse and reusable way of wrapping template or overloaded functions in function objects

Scenario 1: a template function pred template<typename T> bool pred(T t) { /* return a bool based on t */ ... But asking is never crime, right? 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++ - Perfect forwarding container element

Similar to this question, but instead of perfect forwarding member of an object, I would like to know how to perfect forwarding ... (v[i])); } } See Question&Answers more detail:os...

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

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241 views

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c++ - Why doesn't my signal handler (which throws an exception) trigger more than once?

I am trying to set up an exception handler using sigaction. It works well for the first exception. But the sigaction ... >fnct1(); 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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254 views

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c++ - How to return a string of unknown size from DLL to Visual Basic

I have a visual basic script that calls to a DLL which does network requests and returns the result of one ... VB is filled with garbage. See Question&Answers more detail:os...

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

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273 views

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c++ - using tr2::direct_bases get nth element of result

struct T1 {}; struct T2: T1 {}; typedef tr2::direct_bases<T2>::type NEW_TYPE ; should return my ... tuple_element for the reflection list. See Question&Answers more detail:os...

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

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