Recent questions tagged C++

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I have the following source: #include <iostream> using namespace std; void main(int j) { char arr[10][10]; char** ... **. What am I doing 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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c++ - Storing different vertex attributes in different VBO's

Is it possible to store different vertex attributes in different vertex buffers? All the examples I've seen so far ... I would later draw them. 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++ - Draw an item in a static location relative to the QGraphicsView

I would like to draw a notification that always appears in the upper right corner of my QGraphicsView. However ... that supports this 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++ - How to throw good exceptions?

I heard you should never throw a string because there is a lack of information and you'll catch exceptions ... how i should throw exceptions. 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++ - Assigning cout to a variable name

In ANSI C++, how can I assign the cout stream to a variable name? What I want to do is, if the user has ... avoid that if I could. Any ideas? See Question&Answers more detail:os...

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

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256 views

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c++ - Why is delete operator required for virtual destructors

In a freestanding context (no standard libraries, e.g. in operating system development) using g++ the ... -ffreestanding -nostdlib foo.cpp 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++ - Element-wise vector-vector multiplication in BLAS?

Is there a means to do element-wise vector-vector multiplication with BLAS, GSL or any other high performance library ? 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 cast a QVariant to custom class?

I'm developing a BlackBerry 10 mobile application using the Momentics IDE (native SDK). I have a listview which I ... anyone help me on 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++ - uninitialized const

This compiles perfectly fine with the current MSVC compiler: struct Foo { } const foo; However, it fails to compile ... is g++ too strict here? 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++ - Stylesheet on QScrollBar leaves background of scrollbar with checkerboard pattern?

When I style my QScrollBar using a stylesheet, the background color is checkered instead of being solid. QScrollBar ... scrollbar a solid color? 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 curl_easy_perform() synchronous or asynchronous?

I am using curl to send POST and GET requests and I use callback functions to get the replies from these ... try to rephrase it. 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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428 views

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c++ - boost::range::join for multiple ranges

I want to do the following: std::vector<int> a = {1,2,3}, b = {4,5,6}, c = {7,8,9}; for(auto&& i : ... )), join(std::forward<Args>(args)...)); } 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++ - Statically linking a C library with a Haskell library

I have a Haskell project that aims to create some C++ bindings. I've written the C wrappers and compiled ... are no other warnings or errors. 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 template in C++11 to deduce the optimal type to use when passing a value to a function?

I'd like to write a template function template <typename T> void f( T v ); such that v will be ... 't spot anything which seemed relevant. 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++ - constexpr to concatenate two or more char strings

I'm trying to make a constexpr function that will concatenate an arbitrary number of char arrays by working ... a variadic template 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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209 views

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c++ - Are multiple conditional operators in this situation a good idea?

I just saw this block of code on the Wikipedia article on conditional operators: Vehicle new_vehicle = arg == 'B' ? ... use it. It's not arcane. See Question&Answers more detail:os...

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

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182 views

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c++ - using catch(...) (ellipsis) for post-mortem analysis

Someone in a different question suggested using catch(...) to capture all otherwise unhandled - unexpected/ ... to handle expected exceptions? See Question&Answers more detail:os...

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

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362 views

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c++ - CMake FIND_PACKAGE succeeds but returns wrong path

I'm trying to have CMake 2.8.6 link to boost::program_options using the following code in my CMakeLists.txt ... it (or work around 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++ - Can I determine if an argument is string literal?

Is it possible to determine if an argument passed in macro or function is a string literal at compile time or run time ... (p) == false; 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++ - How not to optimize away - mechanics of a folly function

I was searching for a programming technique that would ensure variables used for benchmarking (without observable side ... non portable though) See Question&Answers more detail:os...

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

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199 views

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c++ - Why does a range-based for statement take the range by auto&&?

A range-based for statement is defined in §6.5.4 to be equivalent to: { auto && __range = range-init; ... anything about the choice of auto&&. See Question&Answers more detail:os...

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

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295 views

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c++ - How do I create a custom slot in qt4 designer?

Whenever I use the signal/slot editor dialog box, I have to choose from the existing list of slots. So the ... I create a custom named slot? See Question&Answers more detail:os...

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

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266 views

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c++ - Profiling template metaprogram compilation time

I'm working on a C++ project with extensive compile-time computations. Long compilation time is slowing us ... profiling could be acceptable. See Question&Answers more detail:os...

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

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411 views

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c++ - Is assert(false) ignored in release mode?

I am using VC++. Is assert(false) ignored in release mode? 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 handle big numbers?

I have a very large number, assume some transaction id or big money involved. So, how I will handle the ... ? Does boost support the 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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332 views

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c++ - Embedding python and running for multiple times

I'm using boost::python to embed python, this is how I do it: void runCode(){ Py_Initialize(); //boost ... as expected, any help is appreciated. See Question&Answers more detail:os...

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

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281 views

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c++ - Qt TabWidget Each tab Title Background Color

This is the original Tabwidget without setting title background color My customer ask me to do something like ... each QTabBar background color? See Question&Answers more detail:os...

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

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295 views

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c++ - Can I install CUDA without drivers in Linux CentOS 6 (only cuda toolkit)

I tried to install cuda toolkit without display driver in CentOS 6. It gets installed properly. I was able to ... any card on my machine. See Question&Answers more detail:os...

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

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