Recent questions tagged C++

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c++ - Overloading operator new for a class

When we overload new operator of a class, we declare the function as a member function. For eg: class ... to new member function succeeds? 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 do I use rand_r and how do I use it in a thread safe way?

I am trying to learn how to use rand_r, and after reading this question I am still a little confused, ... the seed is dynamically allocated? 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++ - Frameless and transparent window qt5

I'm quite new to qt and c++ and I've encountered a problem that I can't seem to figure out. I'm wanting to open ... .2 (64-bit) qt creator 2.7.1 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++ - How can I copy a directory using Boost Filesystem

How can I copy a directory using Boost Filesystem? I have tried boost::filesystem::copy_directory() but that ... does not copy the contents. 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 compile openmp using g++

I have a problem about the openmp compiling. Like the following code: #include <iostream> #include <pthread. ... correctly. Thankyou in advance. 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++ - Constructors with default parameters in Header files

I have a cpp file like this: #include Foo.h; Foo::Foo(int a, int b=0) { this->x = a; this->y = b; } How do I refer to this in Foo.h? 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++ cli - C++/CLI Support in .Net Core

Our project structure is like, native.dll :- This contains pure native code written in cc++. This native. ... to this application work ? 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++ - Inspecting STL containers in Visual Studio 2015

I'm running Visual Studio Enterprise 2015, version 14.0.23107.0 D14REL. When debugging a C++ program I cannot see ... this a genuine bug in VS? 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 unwind the stack to get backtrace for the specified stack pointer (SP)?

I'm writing this for Android (ARM only), but I believe the principle is the same for generic Linux as ... way more complicated than I 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++ - "ofstream" as function argument

Is there a way to pass output stream as argument like void foo (std::ofstream dumFile) {} I tried that ... >" has no suitable copy 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++ - is it better to use shared_ptr.reset or operator =?

I'm trying to wrap my head around the new idioms for C++11. It seems that with shared_ptr at least, there ... write mysharedptr.reset(args...);? 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::unordered_map::find using a type different than the Key type?

I have an unordered_map that uses a string-type as a key: std::unordered_map<string, value> map; A std:: ... value. Is there any workaround? See Question&Answers more detail:os...

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

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244 views

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c++ - How to make a QPushButton pressable for enter key?

I want to make my app laptop friendly. I can tab to everywhere, but if I tab to a QPushButton I can't ... How to make it pressable for Enter? See Question&Answers more detail:os...

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

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260 views

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c++ - My programs are blocked by Avast Antivirus

I'm an amateur programmer, and I'm getting desperate and mad because of a big issue: most of my programs are ... , even a very dirty 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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486 views

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c++ - dependent scope; need typename in front;

I want to create a template as follows. I want to delete a list of items from vector vec1. And the indexes ... could anyone help me solve 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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617 views

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c++ - How to use lambda function as hash function in unordered_map?

I wonder if it is possible to use lambda function as custom hash function for unordered_map in C++11? If so, what is the syntax? See Question&Answers more detail:os...

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

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227 views

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c++ - Why aren't container move assignment operators noexcept?

I noticed that std::string's (really std::basic_string's) move assignment operator is noexcept. That makes ... the standard containers are 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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160 views

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c++ - Why can't we declare a variable of type void?

I'm looking for a formal explanation of that fact in the Standard. I've found what 3.9.1/9 says and trying to ... time error int main() { } DEMO See Question&Answers more detail:os...

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

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309 views

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c++ - Are references and pointers equal with regards to polymorphism?

I always think of having to use pointers for polymorphism. Using the canonical example: DrawEngine::render(Shape ... <Rhomboid*>(&shape); 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++ - Dynamic casting for unique_ptr

As it was the case in Boost, C++11 provides some functions for casting shared_ptr: std::static_pointer_cast ... not provided for unique_ptr? See Question&Answers more detail:os...

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

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397 views

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c++ - Can clang format add braces to single line if statements etc

Is there an option for clang-format to add braces to all if()/do/while statements etc? eg if( i == 42 ) ... --version clang-format version 3.6.0 See Question&Answers more detail:os...

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

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360 views

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c++ - Concatenate compile-time strings in a template at compile time?

Currently I have: template <typename T> struct typename_struct<T*> { static char const* name() { return (std:: ... would not be okay with that) See Question&Answers more detail:os...

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

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481 views

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c++ - Count number of 1's in binary format of decimal number

I am trying to find out the number of 1's in binary form of a large decimal number (decimal number ... suggest me an efficient algorithm. See Question&Answers more detail:os...

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

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172 views

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c++ - How to asynchronously copy memory from the host to the device using thrust and CUDA streams

I would like to copy memory from the host to the device using thrust as in thrust::host_vector<float> h_vec(1 << ... .8 in the version.h file). See Question&Answers more detail:os...

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

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323 views

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c++ - Starting Qt GUI from dll (in DLLStart function)

I have to start a Qt GUI from a dll exposing DLLStart and DLLStop. The normal (.exe) approach in main is ... void __stdcall DLLStop(void) { } See Question&Answers more detail:os...

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

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176 views

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c++ - Generic Hash function for all STL-containers

I'm using an std::unordered_map<key,value> in my implementation. i will be using any of the STL containers ... 't use boost libraries. 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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438 views

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c++ - Static variable in a Header File

Static variable has file scope. Say I have two following files: file1.h file1.cpp file2.h file2.cpp I have ... are working in this scenario. See Question&Answers more detail:os...

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

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554 views

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c++ - How to change text color and console color in code::blocks?

I am writing a program in C. I want to change the text color and background color in the console. My sample program ... if the answer is in C++. See Question&Answers more detail:os...

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

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