Recent questions tagged C++

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c++ - Boost::Spirit::QI parser: index of parsed element

Is it possible (using Boost::Spirit::QI) to parse numbers from a comma separated string so that I get the ... function or a similar feature. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Deleting a heap then dereferencing a pointer to that memory

This is code from an exercise: #include <iostream> using namespace std; int main() { int n = 13; int* ip = new ... , it returns 0. Why is this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to build cmake ExternalProject while configurating main one?

It can be a pain to refrence ExternalProjects when their install targets are messed up. So one may want to build and ... CMake and how to do it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to tokenize (words) classifying punctuation as space

Based on this question which was closed rather quickly: Trying to create a program to read a users input then break ... this goal in C++? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Will memcpy or memmove cause problems copying classes?

Suppose I have any kind of class or structure. No virtual functions or anything, just some custom constructors, ... are copying to safe memory. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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356 views

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c++ - Strange exception throw - assign: Operation not permitted

I want to do asynchronous read from cin therefore I have a piece of code client.h ... boost::asio::posix: ... what the problem might be? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to test whether class B is derived from template family of classes

How to test at compile time whether class B is derived from std::vector? template<class A> struct is_derived_from_vector { ... ::endl; // true } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Removing duplicate characters from string using STL

Is there a way to remove duplicate characters from a string like they can be removed from vectors as below sort ... the characters into a set See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - QScrollArea missing Scrollbar

I think it is the same problem as : QScrollArea resizing QWidget but there are not solution. so let me expose ... have a better solution ?? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Skipping expected characters like scanf() with cin

How to achieve scanf("%d # %d",&a,&b);sort of effect with cin in C++ ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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174 views

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c++ - How to convert concatenated strings to wide-char with the C preprocessor?

I am working on a project where I have many constant strings formed by concatenation (numbers, etc.). For ... an option either, unfortunately. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Compiling code containing dynamic parallelism fails

I am doing dynamic parallelism programming using CUDA 5.5 and an NVDIA GeForce GTX 780 whose compute capability is 3 ... What am I doing wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why do I see 400x outlier timings when calling clock_gettime repeatedly?

I'm trying to measure execution time of some commands in c++ by using the physical clock, but I have run into a ... the lack of a better name)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::sort comparing elements to null

I have the following sorting algorithm, which sorts an std::vector of unique armor_set pointers. By ... rhs_collectibles_needed_count; } }); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Class contiguous data

I have a C++ class which has four private floats and a bunch of nonstatic public functions that operate on this ... be that of the first float. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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254 views

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c++ - converting narrow string to wide string

How can i convert a narrow string to a wide string ? I have tried this method : string myName; getline( cin ... narrow string to a wide string ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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329 views

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c++ - Is a struct's address the same as its first member's address?

Consider I have Struct like the following: struct Bitmask { unsigned char payload_length: 7; unsigned char mask ... over a websocket connection. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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358 views

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c++ - Overload resolution: assignment of empty braces

I wrote some code S s; ... s = {};, expecting it to end up the same as S s = {};. However ... to avoid repeating the type or the variable name. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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345 views

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c++ - Workaround for error C2536: cannot specify explicit initializer for arrays in Visual Studio 2013

the following code does not compile with Visual Studio 2013 while it should: class A { A() :m_array{ 0, ... . What are the possible workarounds? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to get hWnd of window opened by ShellExecuteEx.. hProcess?

This "simple" issue seems to be fraught with side issues. eg. Does the new process open multiple windows; Does it have ... it from here? } ... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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262 views

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c++ - Restrict passed parameter to a string literal

I have a class to wrap string literals and calculate the size at compile time. The constructor looks like this: ... there is no better way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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279 views

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c++ - Qmake: how to remove compiler flag for a certain project, without changing qmake.conf?

I'm using qmake and Visual Studio. In release build qmake adds /GL and /O2 flags to all projects, and I need to ... Qt project. Is there a way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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99 views

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c++ - Why is the Console Closing after I've included cin.get()?

I've just started learning C++ using C++ Primer Plus but I'm having trouble with one of the examples. Like the book ... ; cin.get(); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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260 views

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c++ - Why it is different between -2147483648 and (int)-2147483648

When I run the following code under Windows7 x64, compiled with GCC of MinGW, the result seems to be underflowed ... is exactly? Many thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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283 views

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c++ - Is substitution performed on a variadic parameter pack type if the pack is empty?

Consider the following program: #include <type_traits> enum class dummy {}; template <typename T> using EnableIf = ... of the two is correct? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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134 views

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c++ - What is the status on dynarrays?

gcc 4.9 now has support for n3696 (Runtime-sized arrays with automatic storage duration). n3662 says: In N3497 ... stay or will it disappear? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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239 views

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c++ - Huge Integer JavaScript Library

Is there any JavaScript library that can be used for calculations involving 700+ Digits? Also, how about the same thing in C++? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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164 views

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c++ - large negative integer literals

On Visual Studio 2010 the following program #include <iostream> using std::cout; int main() { cout << - ... answer below for more details. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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