Recent questions tagged C++

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c++ - Hash an arbitrary precision value (boost::multiprecision::cpp_int)

I need to get the hash of a value with arbitrary precision (from Boost.Multiprecision); I use the cpp_int ... the arbitrary precision 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++ - Ncurses and Qt Interoperability

Having a Qt and ncurses based application, what is the best way to refresh the screen every second, while waiting ... getch(); processInput(); } 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++ - CMake linking against shared library on windows: error about not finding .lib file

I've got a library definition in CMake that builds a shared library out of a small set of files, and ... errors are thrown while building nnet. 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 truncate a floating point number after a certain number of decimal places (no rounding)?

I'm trying to print the number 684.545007 with 2 points precision in the sense that the number be truncated ( ... knows how can I correct 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++ - Emulating shifts on 32 bytes with AVX

I am migrating vectorized code written using SSE2 intrinsics to AVX2 intrinsics. Much to my disappointment, ... remains for _mm256_srli_si256. 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++ - Proper way to copy C strings

Is there an easy way to copy C strings? I have const char *stringA, and I want char *stringB to take ... easy access to individual characters.) 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++ - Sorting a std::vector<std::pair<std::string,bool>> by the string?

How can I sort this vector by comparing the pair.first which is an std::string? (without providing a static compare function, nor use boost). 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++ - Adding types to the std namespace

Is it acceptable to add types to the std namespace. For example, I want a TCHAR-friendly string, so is the ... should I use my own namespace? 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++ - Project Euler #8, I don't understand where I'm going wrong

I'm working on project euler problem number eight, in which ive been supplied this ridiculously large number: ... it worked. Thanks everyone! 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++ - Portability of #warning preprocessor directive

I know that the #warning directive is not standard C/C++, but several compilers support it, including gcc/g++ ... that don't support 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++ - standard conversions: Array-to-pointer conversion

This is the point from ISO :Standard Conversions:Array-to-pointer conversion: $4.2.1 An lvalue or rvalue of ... example of rvalue of array 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++ - Trouble launching CUDA kernels from static initialization code

I have a class that calls a kernel in its constructor, as follows: "ScalarField.h" #include <iostream> ... right value for dimensions though. 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++ - Declare large array on Stack

I am using Dev C++ to write a simulation program. For it, I need to declare a single dimensional array with ... declare this array on the stack? 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 the purpose and return type of the __builtin_offsetof operator?

What is the purpose of __builtin_offsetof operator (or _FOFF operator in Symbian) in C++? In addition what does ... ? Pointer? Number of bytes? 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 convert char* to LPCWSTR?

I know this has already been discussed in several questions on SO, but none of those solutions have worked for ... do I make this conversion? 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++ - Trial-division code runs 2x faster as 32-bit on Windows than 64-bit on Linux

I have a piece of code that runs 2x faster on windows than on linux. Here are the times I measured: g ... for this? Some scheduler issues? 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++ - STL vector and thread-safety

Let's say I have a vector of N elements, but up to n elements of this vector have meaningful data. ... performant,known and lock-free vectors? 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 parent class constructors called before initializing variables?

Are parent class constructors called before initializing variables, or will the compiler initialize the variables of the class ... () {}; } 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/are the purpose(s) of inline?

I had a discussion with Johannes Schaub regarding the keyword inline. The code there was this: namespace ... { ... anything else I am missing? 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++ - When including header files, is the path case sensitive?

Given this directory tree: src/MyLibrary/MyHeader.h src/file.cpp file.cpp: #include "mylibrary/myheader.h" ... ... same when including? 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++ - Intrinsics for CPUID like informations?

Considering that I'm coding in C++, if possible, I would like to use an Intrinsics-like solution to read ... this kind of informations at all. 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++ - Mixing class and struct

I'm well aware of the difference between class and struct, however I'm struggling to authoritatively say if this ... much as warned about 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++ - typedef changes meaning

When I compile the following snippet with g++ template<class T> class A {}; template<class T> class B { ... And is the second behavior standard? 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::bind overload resolution

The following code works fine #include <functional> using namespace std; using namespace std::placeholders; class ... two integer arguments? 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 include omp.h in OS X?

I'm new in C and have some problems compiling my code in OS X. I code Java a lot both in Eclipse and ... for reading. 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++ - Use channel hiearchy of Boost.Log for severity and sink filtering

I have been studying Boost.Log for a while and I believe now is the time for me to transition my code ... I sincerely appreciate your comments. 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++ - Generating an interface without virtual functions?

I'm coding a game engine and I have this class set up for objects: class SceneManager //controls everything in ... deal with this. 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 Can I Pass a Member Function to a Function Pointer?

class Child; class Parent { public: void (*funcPointer)(); void (*funcPointer2)(Parent* _this); void ( ... then call that function pointer? See Question&Answers more detail:os...

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

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