Recent questions tagged C++

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c++ cli - How do I specify a fixed-size buffer in C++/CLI?

In C#, I can specify a fixed sized buffer using the fixed keyword, like so: public unsafe struct StructWithFixedBuffer { ... thing in C++/CLI? 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++ - Constructing a std::map from initializer_list error

I'm trying to make a class constructor that will take an initializer list and init a map with it like this: ... to change to make this work? 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 use QML_IMPORT_PATH with Qt Cmake Project?

I need to provide some modules for project. Now, it looks for them in QT directory(I've installed it in $HOME), ... here, so I can help others. 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 use conio.h?

I often see people use the header file of conio.h in C and C++, although I can′t see any major benefits ... ? Why to choose the conio 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++ - Random Number to each Process in MPI

I'm using MPICH2 to implement an "Odd-Even" Sort. I did the implementation but when I randomize to each ... values for each process :) 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++ - Detaching a started process

I've started a process using QProcess::start() and I need to detach it afterwards. How can I do it? I ... and the detaching of the process). 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 Spirit QI slow

I try to parse TPCH files with Boost Spirit QI. My implementation inspired by the employee example of Spirit ... length tokens into strings? 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++ - Sleeping for an exact duration

My understanding of the Sleep function is that it follows "at least semantics" i.e. sleep(5) will guarantee ... period (without busy waiting). 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++ - Programmatically differentiating between USB Floppy Drive and USB Flash Drive in Windows

On Windows (XP-7), is there a reliable way of programatically differentiating between USB floppy drives and USB ... wanted to be clear! 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++ - Why don't rvalues have an address?

Why don't rvalues have a memory address? Are they not loaded into the RAM when the program executes or ... values stored in processor registers? 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 gcc 4.7.1 support threads?

I followed the instruction here on setting up CodeBlocks to use GCC 4.7.1 .the sample provided at the page i ... minutes, 6 seconds) ===| 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++ - Move constructor signature

From this reference, it allows a const rvalue as a move constructor Type::Type( const Type&& other ); How ... such declaration would be useful? 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 see definition of Q_SIGNALS, Q_SLOT, SLOT(), SIGNAL() macros? (Qt)

Is it possible to see definition of Q_SIGNALS, Q_SLOT, SLOT(), SIGNAL() macros in Qt framework? P.S. Google gave me nothing in this question. 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++ - Determine the size of a pipe without calling read()

I need a function called SizeOfPipe() which should return the size of a pipe - I only want to know how ... this if possible. Any suggestions? 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: call of overloaded ‘max(int, int)’ is ambiguous

#include <iostream> using namespace std; template<typename T> T max(T lhs, T rhs) { return lhs < rhs ? rhs : ... ] How do I correct this error? 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 do data() and c_str() return char const*, while operator[] returns char&?

Why do std::string::data and std::string::c_str() return pointers to const chars, while std::string:: ... What is the rationale behind 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++ - Indenting Paragraph With cout

Given a string of unknown length, how can you output it using cout so that the entire string displays as an ... + way to accomplish the above. 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 between type casting & type conversion?

Is there any difference between type casting & type conversion in 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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c++ - Does msvcrt uses a different heap for allocations since (vs2012/2010/2013)

I've read about that some time ago but am unable to locate the change to the crt on msdn or anywhere ... topic with colleagues some time ago) 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 uniform initialization (initialization with braces) is recommended?

I see a lot of different places that uniform initialization is recommended. Herb Sutter recommends it, and ... my thinking wrong somewhere? 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++ - Use of void template argument in early detection idiom implementation

In n4502 the authors describe an early implementation of the detect idiom that encapsulates the void_t trick. Here ... m just missing something. 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++ - Are pointers allowed as keys in ordered STL containers?

There's this other question asking about how comparing pointers is supposed to be interpreted wrt the C++ Std. ... :less or builtin operator <? 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 when using CMake with LLVM

So I'm trying to build a toy compiler using LLVM and I'd like to use CMake as my build system. I tried ... or is something that I can fix? 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 actually going on in this AnonymousClass(variable) declaration?

Trying to compile: class AnonymousClass { public: AnonymousClass(int x) { } }; int main() { int x; ... m not familiar 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 globally set the default clause to none?

I know I can tell OpenMP not to share variables by default within a parallel region by using #pragma omp ... private than should be shared. 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++ - JNI_CreateJavaVM() terminates with exit code 1

I'm trying to call a Java method from C++ using JNI. To do that I've installed jdk1.7.0_51, ... & suggestions would be highly 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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c++ - no matching function for call to ‘regex_search(...)'

Given an old-style const char * pointer and a length, is there a way to call std::regex_search() on it ... Am I misunderstanding how this works? 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++ - Lambda Works on Latest Visual Studio, but Doesn't Work Elsewhere

So I've written a nasty lambda to satisfy a "shortest amount of code necessary to achieve this" question: ... s causing the different 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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