Recent questions tagged C++

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c++ - How to serialize boost::dynamic_bitset?

How to serialize a class with a boost::dynamic_bitset member? #include <boost/archive/text_oarchive.hpp> #include ... member named serialize' 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++ - isdigit(c) - a char or int type?

I have written the following code to test if the given input is a digit or not. #include<iostream> #include< ... variable type? char or int? 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++ - Static constexpr odr-used or not?

How come that the following works on gcc but doesn't on clang, (see it live): constexpr int giveMeValue() { return ... it is, is it odr-used? 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 make GCC warn on passing too-wide types to functions?

Following is some obviously-defective code for which I think the compiler should emit a diagnostic. But neither gcc ... can try my test 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++ - Convert lptstr to char*

Would anyone happen to know how to convert type LPTSTR to char * 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++ - Unique_ptr and forward declaration

Say I have two classes: "Foo.h" #pragma once class Foo { public: Foo() { }; ~Foo() { }; }; " ... Studio 2013. http://www.filedropper.com/test_61 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++ - C function pointers with C++11 lambdas

So i'm trying to write an Integration function to be used with c++11 lambdas. The code looks something like this ... . How should I solve 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++ - Diamond Inheritance Lowest Base Class Constructor

The Code is as follow : The Code : #include <iostream> using namespace std; class Animal{ int a; public: ... its constructor twice ? Thank you 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 can I extract the mantissa of a double

I would like to store in a variable the mantisssa of a double I have post a code to get the binary ... I change to isolate the mantissa 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++ - Overriding static variables when subclassing

I have a class, lets call it A, and within that class definition I have the following: static QPainterPath ... ) be real and instantiatable? 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++ - Using erase-remove_if idiom

Let's say I have std::vector<std::pair<int,Direction>>. I am trying to use erase-remove_if idiom to remove ... Up What am I doing wrong 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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c++ - What is half open range and off the end value

What do these terminologies mean in C++? 1. off the end value 2. half open range - [begin, off_the_end) ... them while reading about for loops. 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++ - Void ** a generic pointer?

void * is a generic pointer, but what about void **? Is void ** also a generic pointer? Can we typecast ... family for any information on 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++ - Does case-switch work like this?

I came across a case-switch piece of code today and was a bit surprised to see how it worked. The code was: ... s the point of having a 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++ - boost.python not supporting parallelism?

I am trying to wrap a piece of C++ code into python lib using boost.python, however, I found out that ... attack thank you 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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c++ - Does accessing a declared non-volatile object through a volatile reference/pointer confer volatile rules upon said accesses?

This'll be a long one, as to contextualise it and provide as much info as I can, I must meander through ... from experts would be very welcome. 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 enable experimental C++11 concurrency features in MinGW?

When trying to compile the following code #include <thread> #include <iostream> void foo() { std::cout << " ... performs good this code sample. 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 doesn't pass command line arguments

Hello I have the following code but it isn't working as expected, can't figure out what the problem is. ... to an instance of an object 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++ - Function Prologue and Epilogue in C

I know data in nested function calls go to the Stack.The stack itself implements a step-by-step method for ... general view, not too detailed. 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++ - g++ How to get warning on ignoring function return value

lint produces some warning like: foo.c XXX Warning 534: Ignoring return value of function bar() From the ... apparently did not detect 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++ - Is sizeof(*ptr) undefined behavior when pointing to invalid memory?

We all know that dereferencing an null pointer or a pointer to unallocated memory invokes undefined behaviour. But ... Is this also undefined? 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++ - Forwarding all constructors in C++0x

What is the correct way to forward all of the parent's constructors in C++0x? I have been doing this: class X: public ... : Super(args...) {} }; 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::asio - how to interrupt a blocked tcp server thread?

I'm working on a multithreaded application in which one thread acts as a tcp server which receives commands from a ... 't interrupt. Any ideas? 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 open a GStreamer pipeline from OpenCV with VideoWriter

I am capturing video frames with OpenCV VideoCapture. The capturing works fine as I am able to use ... decodebin ! videoconvert ! autovideosink 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 a DLL with SWIG from Visual Studio 2010

I've been trying for weeks to get Microsoft Visual Studio 2010 to create a DLL for me with SWIG. If you have ... that I am targeting is Python. 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 do static linking of libwinpthread-1.dll in mingw?

I use mingw from here: http://sourceforge.net/projects/mingwbuilds/files/host-windows/releases/4.7.2/32-bit/ ... same with libwinpthread-1.dll. 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++ sizeof(array) return twice the array's declared length

I have a section of code in which two array are declared with sizes of 6 and 13, but when 'sizeof()' is used ... system("pause"); 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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c++ - gdb is jumping over lines

i have some problems on understanding gdb. i have a main function, i wrote this main function on myself. Some ... , why? Thanks in advnce. See Question&Answers more detail:os...

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

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