Recent questions tagged C++

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c++ - What's the right way to overload the stream operators << >> for my class?

I'm a bit confused about how to overload the stream operators for my class in C++, since it seems they are ... - how do I do 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++ - how to create boost phoenix make_shared?

Is it possible to create boost phoenix lazy variant of std::make_shared? I mean, to make possible something like ... is possible to write 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++ - Automake AM_LDADD workaround

I want to set the same LDADD attribute (Unit test library) to a large number of targets (unit test C++ files ... = ... test20_LDADD = -llibrary 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++ - Compiling with int main(void) fails; main(int argc, char *argv[]) succeeds. Why?

Problem Why would compiling a program which has an int main(void) main function differ from compiling a ... reference to `_WinMain@16' 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++ - Crypto++ explicit destruction during encryption/decryption?

I wrote some wrapper functions to encrypt/decrypt files using crypto++. I tried looking in the wiki but could ... 1B4ED692F91A3224 Size of iv: 8 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++ - openmp : check if nested parallesim

Assume I have a method that multiplies two std::vector : double multiply(std::vector<double> const& a, std::vector< ... then it's "turn on". 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 having const and non-const accessors?

Why do the STL containers define const and non-const versions of accessors ? What is the advantage of defining ... the non-const version ? 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++ - Program skips cin.getline()

I have made this program, It get the users adress, name and work. Then It puts it all into one string and ... this happen and how to fix it? 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++ - Overloading on const and volatile- why does it work by reference?

I have the code: #include "stdafx.h" #include <iostream> using namespace std; void func(const int& a) { std::cout ... but a normal int is not. 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 number as it's prime number parts

I have to print the number of ways you can represent a given number as it's prime number parts. Let me clarify: Let's ... 2 5 + 2 7 <= excluded 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++ - Using make_shared with a protected constructor + abstract interface

Given an abstract interface and an implementation derived from that interface, where constructors are protected (creation of ... = Create(); } 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++ - Difference between Static variable declared in different scopes

What is the difference between declaring static variable inside a block and outside a block in a file? Eg, here, ... code here; return 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++ - Sequence array initialization with template

I want to initialize an array with a sequence of ints from 0 to N - 1 #include <array> #include <iostream> ... How to "concatenate" the values ? 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++ - Parsing escaped strings with boost spirit

I′m working with Spirit 2.4 and I'd want to parse a structure like this: Text{text_field}; The point is that ... doesn't even compile. Any idea? 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 is the # for when formatting using %s

I came across this example of an assertion and was wondering what the # is for: #define ASSERT( x ) if ( !( x ) ) ... ] Halting.", #x); *p=1; } 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++ - Can I program for Macs without owning one?

I'm programming a game using C++ and OpenGL/SDL, using Visual Studio as my IDE. I don't own a Mac, nor ... will I need to use another compiler? 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++ - Force write of a file to disk

I'm currently implementing a ping/pong buffering scheme to safely write a file to disk. I'm using C++/ ... doesn't guarantee the actual write 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++ - MSVCP100D.dll missing

When I try to debug my C++ application I get the error The program can't start because MSVCP100D.dll is ... Visual Studio fix this problem? 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 can I generate a tuple of N type T's?

I want to be able to write generate_tuple_type<int, 3> which would internally have a type alias type which would ... How can I accomplish 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++ - using boost multi_index_container to preserve insertion order

I initially started out using a std::multimap to store many values with the same key, but then I ... even provide an example themselves? 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++ - Unpredictable behaviour of std::sleep_for on Windows 10

Recently I discovered that for unknown reason std::this_thread::sleep_for can sleep 10 times longer than ... -resolution-megawatts-wasted/ 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++ - Shifting 4 integers right by different values SIMD

SSE does not provide a way of shifting packed integers by a variable amount (I can use any instructions AVX and ... about 20 cycles I think. See Question&Answers more detail:os...

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

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474 views

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c++ - Const correctness: const char const * const GetName const (//stuff);

Labelled as homework because this was a question on a midterm I wrote that I don't understand the answer to. ... for each of these consts? 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 main functions

Can we have two main() functions in a C++ program? 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++ - ifstream:: What is the maximum file size that a ifstream can read

I tried to read a 3GB data file using ifstream and it gives me wrong file size, whereas when I read a ... ifstream can't read large files? See Question&Answers more detail:os...

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

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374 views

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c++ - what to do if debug runs fine, but release crashes

I have an application that runs just fine in the debug build, but when I start it in the release build, ... situation to track down the problem? See Question&Answers more detail:os...

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

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306 views

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c++ - API Hook on a COM object function?

Greetings StackOverflowians, As discovered here, Windows 7 features a bug in which the DISPID_BEFORENAVIGATE2 event does not ... S_FALSE; } } 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++ - Merge two STL vectors with an alternation pattern

I have two STL vectors A and B and need to merge them into a third one, where the elements should be ... instead of my hand-written loops? See Question&Answers more detail:os...

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

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