Recent questions tagged C++

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c++ - How might I overload the "new" operator to allocate memory from a secondary memory device?

I am looking for a syntax to allocate memory from a secondary memory device and not from the default heap. How ... there must be another way! 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++ - a constant in dependent base class make out-of-line definition not matched?

template<template<typename, size_t>class V, typename, size_t N> struct X{ static constexpr size_t stride = N; }; ... ://godbolt.org/z/asn8rj. 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 configure calculation of CRC table

There are a lot of CRC calculation examples out there. Simple implementations with bit shifting and more efficient with ... , expected); } } 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++ - std::atomic library dependency (gcc 4.7.3)

I've been trying to compile with std::atomic, and I'm getting unresolved references to __atomic_load, ... ld returned 1 exit status 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++ - OpenGL Rotation of an object around a line

I am programming in OpenGL and C++. I know 2 points on 1 line (a diagonal line) and wish to rotate an ... axis but am not sure about 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++ - EnumDisplayMonitors callback

I am trying to use the EnumDisplayMonitors to create a dynamic array of each monitor and store the DISPLAY_DEVICE ... mA->addScreen(&iMonitor); 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 create a variable size char array in VC++

const int sizea = 600; char sz[sizea]; above code works fine. But below code segment cause errors. I'm ... allocate an array of constant size 0 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++ - GetLogicalDriveStrings() and char - Where am I doing wrongly

I want to search a file which may be present in any drives such as C:, D: etc. Using ... Microsoft Visual C++ 2010 Express 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++ - Separating public and private keys from RSA keypair variable

As the title says, I have some code that generates a pair of RSA keys. I want to split them apart and ... -key-encryption-with-rsa-and-openssl/ 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 draw clothoids graphically in Qt?

I am trying to build an application which the user can use to draw clothoids with the mouse, i.e. to set the ... codes that I could run in Qt? See Question&Answers more detail:os...

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

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300 views

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c++ - Cast a boost::log::expressions::attr< std::string > to std::string

While using Boost.Log, I am trying to keep my TimeStamp formatter such as: logging::add_file_log ( keywords::file_name ... ::path::filename() ? 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::asio read from /dev/input/event0

I am looking to use boost::asio to read from a 12 digit keypad. I currently can do it without boost, this ... its not serial, right? Thank you. See Question&Answers more detail:os...

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

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436 views

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c++ - OpenGL 2D hud in 3D application

I have been trying to create a hud in my OpenGL application. Having looked around, it seems the way to do it ... glVertex2f(100,50); glEnd(); 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 redefine clog to tee to original clog and a log file?

I saw a useful start here: http://www.cs.technion.ac.il/~imaman/programs/teestream.html And it works great ... target of clog? Thanks. -William 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++ - Check if string contains a range of numbers

I'd like to test a std::string for containing numbers of any range e.g 5 to 35 in a std::string s = " ... then use a loop to find each 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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353 views

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c++ - Using Crypto++ to generate random hashes with SHA1

I need to generate a random hash using Crypto++, using SHA1. At the moment I have: #include <cryptopp/sha ... will be much appreciated. 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++ - Masking a blob from a binary image

I am doing motion recognition of walking using openCV and C++ and I would like to create a mask or copied image ... possible w.r.t. my 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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524 views

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c++ - Comparison signed and unsigned char

It seems so strange. I found misunderstanding. I use gcc with char as signed char. I always thought that in ... if it's not just bitwise? 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.Python custom converter

I have a class taking a vector as parameter (a binary file content). I would like to convert python 'str' ... register a per-method converter ? 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++ - Two-dimensional vector printing

I've got a two-dimension string vector that I need to print out. The whole program should read a line from a ... ); lines.push_back(row); } } See Question&Answers more detail:os...

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

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472 views

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c++ - Compiling Eigen library with nvcc (CUDA)

I tried to compile following program (main.cu) with the nvcc (CUDA 5.0 RC): #include <Eigen/Core> ... the host compiler it works perfectly. See Question&Answers more detail:os...

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

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223 views

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c++ - Avoiding virtual methods in constructor

Say I have the following class hierarchy: class Base { virtual int GetClassID(){ return 0;}; public: Base ... virtual method in the constructor? See Question&Answers more detail:os...

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

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301 views

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c++ - How do virtual destructors work?

I am using gcc. I am aware how the virtual destructors solve the problem when we destroy a derived class object ... the vtable of A and B? 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++ - Physical constness of a class

I'm studying "The C++ Programming Language" from Bjarne Stroustrup and he talks about logical and physical ... class has a constructor? 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++ - Best way to specialise operator<< for std::ostream and std::vector with generic template functions?

I am having trouble with the two-phase look-up as specified by the standard and (correctly) implemented by clang ... define the operator in NS). 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 rvalue passed as parameter treated as lvalue inside the function?

I have a View and a Shape class where the View "owns" its Shape objects. I am implementing this as a vector of ... .add_shape(std::move(ups)); } See Question&Answers more detail:os...

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

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358 views

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c++ - boost spirit qi numeric parsing of integer and floating points

i am trying to make sense of the following result. The test case code is #include <boost/config/ ... interpreted as floating point) 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++ - Incomplete Type

I'm getting a incomplete type error for the 'next' and 'previous' variables. I'm not sure what I am doing ... move.getElement() << endl; } See Question&Answers more detail:os...

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

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