Recent questions tagged C++

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c++ cli - C++ CLI error C3767: candidate function(s) not accessible

I'm new to C++ CLI coming from unmanaged C++ world. I'm getting this error: candidate function(s) ... ': candidate function(s) not accessible 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++ - EXE or DLL Image base address

Is there a way in C++/windows to get the exe/DLL image base address? 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++ - gcc - how to create a mapfile of the object file

I have a .map file called a.out.map that was created from a .cpp/.obj file but I don't remember how. I ... gcc command to produce the .map file? 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 should std::vector::data() return if the vector is empty?

According to the draft standard (23.3.6.4 vector data), data() points to the underlying array and [data(), ... or may it also return non-null? 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++ - SFINAE works differently in cases of type and non-type template parameters

Why does this code work: template< typename T, std::enable_if_t<std::is_same<T, int>::value, T>* = nullptr> ... non-type, then everything is ok. 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++ - structured bindings: when something looks like a reference and behaves similarly to a reference, but it's not a reference

Yesterday I've seen an interesting question here on SO about structured binding. We can sum up it as it ... that a profane can understand? 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 use std::imbue to set the locale for std::wcout?

I am trying to use the std::locale mechanism in C++11 to count words in different languages. Specifically, I have std:: ... << word << "" "; } 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++ - Disable Eclipse's error discovery. (Codan false positives)

My experience until now is, that the error discovery of Eclipse is horribly buggish without any solutions (Tried ... how to accomplish 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++ - Why does std::istringstream appear to resolve differently to std::ifstream in the ternary (?:) operator?

I am used to writing little command line tools that take either a file name or read from std::cin, so I ... types? Or am I missing something? 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++ - If I want to specialise just one method in a template, how do I do it?

Say I have a templated class like template <typename T> struct Node { // general method split void split() { ... split() method, nothing more. 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::vector of std::vectors contiguity

I know that std::vector<T> internally stores it's data contiguously (unless it is std::vector<bool>) both in the ... be done for a 1-D vector? See Question&Answers more detail:os...

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

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269 views

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c++ - Arithmetic right shift gives bogus result?

I must be absolutely crazy here, but gcc 4.7.3 on my machine is giving the most absurd result. Here is the ... What could possibly be going on? See Question&Answers more detail:os...

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

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254 views

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c++ - How to select a random element in std::set?

How can I select a random element in an std::set? I naively tried this: int GetSample(const std::set<int>& s ... + is not allowed in this way. 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 std::pair<int, std::string> ordering well-defined?

It seems that I can sort a std::vector<std::pair<int, std::string>>, and it will sort based on the ... a default ordering based on its elements? See Question&Answers more detail:os...

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

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212 views

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c++ - When extending a padded struct, why can't extra fields be placed in the tail padding?

Let's consider the structs : struct S1 { int a; char b; }; struct S2 { struct S1 s; /* struct needed to ... and what is the reason behind 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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286 views

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c++ - scanf on an istream object

NOTE: I've seen the post What is the cin analougus of scanf formatted input? before asking the question and ... existing work on this? 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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163 views

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c++ - Somehow register my classes in a list

I would like to be able to register my classes within a std::map or a vector, don't think about duplicates ... was thinking to create somehow... 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++ - Member fields, order of construction

In C++, when doing something like what you see below, is the order of construction guaranteed? Logger::Logger() : ... kFilePath_) { // ... } 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 does *(&arr + 1) - arr give the length in elements of array arr?

#include <iostream> using namespace std; int main() { int arr[5] = {5, 8, 1, 3, 6}; int len = *(&arr ... the address by this code here: &arr + 1 See Question&Answers more detail:os...

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

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345 views

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c++ - sine wave that slowly ramps up frequency from f1 to f2 for a given time

I'm writing a c program to generate a sinusoidal wave that slowly ramps up frequency from f1 to f2 ... be looking into Fourier transformations? 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++ - Order of calling base class constructor from derived class initialization list

struct B { int b1, b2; B(int, int); }; struct D : B { int d1, d2; // which is technically ... more technical aspect and not on coding styles. See Question&Answers more detail:os...

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

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535 views

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c++ - What is the proper way to securely disconnect an asio SSL socket?

A boost-asio SSL/TLS TCP socket is implemented as an ssl::stream over a tcp::socket: boost::asio::ssl:: ... disconnect a boost-asio SSL socket? See Question&Answers more detail:os...

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

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185 views

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c++ - Boost::Spirit Expression Parser

I have another problem with my boost::spirit parser. template<typename Iterator> struct expression: qi::grammar<Iterator ... How to 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++ - Why does my program hang when opening a mkfifo-ed pipe?

I use mkfifo to create a named pipe. Then I use the following program to open it. However, the program hangs at ... ; fclose(fp); 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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155 views

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c++ - Extending temporary's lifetime through rvalue data-member works with aggregate, but not with constructor, why?

I've found the following scheme to extend a temporaries lifetime works, I don't know if it should, but it ... rules for rvalue refs the same? See Question&Answers more detail:os...

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

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853 views

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c++ - Explicit specialization in non-namespace scope does not compile in GCC

The following code compiles in Clang but does not in GCC: template<typename T> struct Widget { template<typename U> void ... , with -std=c++2a. See Question&Answers more detail:os...

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

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155 views

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c++ - Image scaling (KeepAspectRatioByExpanding) through OpenGL

I'm trying to implement image scaling in OpenGL using only glTexCoord2f() and glVertex2f(). Let me explain: ... can download the data file. See Question&Answers more detail:os...

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

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401 views

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c++ - Deducing first template argument with other template parameters defaulted

Gcc and clang seem to disagree on whether this code should compile or not: #include <type_traits> template <typename ... made to work in clang? See Question&Answers more detail:os...

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

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