Recent questions tagged C++

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c++ - Can initializing expression use the variable itself?

Consider the following code: #include <iostream> struct Data { int x, y; }; Data fill(Data& data) { data.x= ... being POD or in some other case? 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++ - Is conversion allowed with std::vector's template constructor taking iterators?

In the C++11 standard, Section 23.3.6.2 [vector.cons], the following is said: template <class InputIterator> vector ... std::cout<<std::endl; } 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++ - Are returned locals automatically xvalues

Following on from a comment I made on this: passing std::vector to constructor and move semantics Is the ... the behaviour compiler dependent? 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 Doesn't string::data() Provide a Mutable char*?

In c++11 array, string, and vector all got the data method which: Returns pointer to the underlying array serving ... () would be so helpful? 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 do I construct a std::string from a DWORD?

I have following code: Tools::Logger.Log(string(GetLastError()), Error); GetLastError() returns a DWORD a numeric ... DWORD. What can I do? 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++ - size of pointers and architecture

By conducting a basic test by running a simple C++ program on a normal desktop PC it seems plausible to ... of pointers to target architecture 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++ - Does std::string need to store its character in a contiguous piece of memory?

I know that in C++98, neither std::basic_string<> nor std::vector<> were required to use contiguous storage. This ... old code doesn't use 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 use std::atomic efficiently

std::atomic is new feature introduced by c++11 but I can't find much tutorial on how to use it ... the conclusion for x86/x64 processors? 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++ - Can I Reference Previous Members of an Initializer List?

Say I want to refer to a member of an initializer_list that I already defined. Can I do it? This code compiles and gives ... {13, foo[0] + 42}; 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 is the same value output for A[0], &A, and *A?

I am doing a little experiment. #include<cstdio> #include<iostream> using namespace std; int main() { int A[5] ... explain why this is the case? 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++ - Dereferencing a 50% out of bound pointer (array of array)

This is a new question in my "I don't understand pointers in C and C++" collection. If I mix the bits ... an object with an object of same type 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++ - thrust::max_element slow in comparison cublasIsamax - More efficient implementation?

I need a fast and efficient implementation for finding the index of the maximum value in an array in ... memory transactions without knowing? 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++ - Optimizing flex string literal parsing

I am starting writing a lexical analyzer for my programming language. String literals in this language start with a " ... ? What would be 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 generate random number within range (-x,x)

Hi It is possible to generate random number within a range (-x,x) using rand()?? If not, how can I generate random number withing that range ? 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++ - Cross compile error "arm-none-eabi-g++ cannot find entry symbol"

I have a problem about cross compile. #include <stdio.h> int main() { printf("hello "); return 0; } ... (Sourcery CodeBench Lite 2013.05-23) 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++ - detect text contours in image

I have a program here which binarize images with text. In a part in the program you can enable a crop function which ... (lhs.y - rhs.y); } 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 create qDebug signal from another thread to the Qt5 GUI thread

I am trying to display log messages from a work thread in a GUI. I am trying to follow redirect qDebug to ... , it also freezes my system. 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++ - Searching for every occurrence of a string in another process's memory

I am attempting to retrieve every occurrence of a certain string, say "ExampleString". What I currently have will ... } } return locations; } 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++ - Splitting a string

I have this code to split a string. For some reason, it just sits there doing nothing. I am not sure what the ... = temp; } return tokens; } 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 get garbage value when output character array to console?

I always get a garbage value like this 'íyyyy?????????t?t' at the end when i output my array. What ... the buffer, there is no garbage value. 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++ - While loop in main thread is getting stuck when using std::thread

I have a simple C++ code to test and understand threading. The code has the main thread + a secondary ... wrong, any help is appreciated. 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 check if the input number integer not float?

I want to check if the input is valid, but when i do run this code I see that it checks only input for ... code see if the input is 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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c++ - boost::interprocess scoped_allocator AND Containers of containers NOT in shared memory

I have a similar question as before in boost::interprocess Containers of containers NOT in shared memory and How to I ... lists << std::endl; } 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++ - Marshal an array of strings from C# to C code using p/invoke

I need to pass an array of C# strings into C code Example C code void print_string_array(const char** str_array, ... Still get the same errors. 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++ - Correct Code - Non-blocking pipe with popen

There are tons of questions about non blocking pipes, but there are NO examples of code that can be copy&paste (with ... break; } pclose(pipe); 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++ - volatile and multithreading?

In the following code: #include <pthread.h> #include <unistd.h> #include <stdio.h> pthread_mutex_t mutex = ... when I have a chance. 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++ - I can't get __dealloc__ be called when deleting an object

I have the following C++ class : .H class ALabSet: public LabSet { public: PyObject *m_obj; ALabSet(PyObject *obj); ... , or ... Thanks a lot 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++ - CreateProcess cmd.exe read/write pipes deadlock

Hello I am trying to make a front end GUI for cmd.exe so I can make it wider but I got stuck. I try to ... I fix this? Thanks for your help. See Question&Answers more detail:os...

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

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