Recent questions tagged C++

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c++ - std::initializer_list as function argument

For some reason I thought C++0x allowed std::initializer_list as function argument for functions that expect types that can ... , "test"} ); } 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++ - C2977: 'std::tuple' : too many template arguments (MSVC11)

I'm trying to build googletest with Visual C++ 11, but following code causes an error template <typename T1, ... ::tuple to std::tuple ) 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 convert enum to QString?

I am trying to use the Qt reflection for converting enum to QString. Here is the part of code: ... about convertEnumToQString, please share 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++ - Class template specialization partial ordering and function synthesis

The rules for picking which class template specialization is preferred involve rewriting the specializations into function ... these two cases? 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 difference? clang++ | clang -std=c++11

I had been erroneously using this command, which failed at the link step: $ clang -std=c++11 -stdlib=libc++ ... same thing as clang++? 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++ - Elegant way to pass multiple arguments to a function

I've got a function which looks like this: bool generate_script (bool net, bool tv, bool phone, std::string ... as arguments to this function? 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 does an object file contain?

During the various stages of compilation in C or C++, I know that an object file gets generated (i.e., ... compiler which we use on Unix? 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 are unsigned integers error prone?

I was looking at this video. Bjarne Stroustrup says that unsigned ints are error prone and lead to bugs. So, ... by giving an suitable example? 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++ - I'm getting an error "invalid use of incomplete type 'class map'

I am making a basic text based RPG sorry if my question is stupid because im new to c++. So basically I have a small ... = rand() % 2; } }; 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++ - Obtaining list of keys and values from unordered_map

What is the most efficient way of obtaining lists (as a vector) of the keys and values from an unordered_map? ... since I might switch to 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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c++ - Why isn't #pragma once automatically assumed?

What's the point of telling the compiler specifically to include the file only once? Wouldn't it make sense ... to do with specific hardware? 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 std::vector as view on to raw memory

I'm using a external library which at some point gives me a raw pointer to an array of integers and a size. ... data set could be really big. 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 std::pair and std::tuple with only two members?

Is there a difference between an std::pair and an std::tuple with only two members? (Besides the obvious that std: ... may have more or less...) 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 are the common causes for high CPU usage?

Background: In my application written in C++, I have created 3 threads: AnalysisThread (or Producer) : it reads ... common ways to solve 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++ - What compiler is in Visual Studio 2015

Can anyone tell me what compiler is built-in to Visual Studio 2015 for C++ projects? I tried it and tried older ... 4.8.2 or a newer 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++ - SFINAE with invalid function-type or array-type parameters?

Please consider this code: template<typename T> char (&f(T[1]))[1]; template<typename T> char (&f(... ... work and reject the first overload. 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++ - Noexcept and copy, move constructors

Everywhere I look it seems to be the agreement that the standard library must call copy constructors instead of move ... ) v.emplace_back(); } 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 write a custom native visualizer DLL for Visual Studio 2012 debugger?

What is needed to write a custom native visualizer DLL in C++ for Visual Studio 2012 debugger? I want to ... on class/struct member 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++ - Best way to design for localization of strings

This is kinda a general question, open for opinions. I've been trying to come up with a good way to design ... what I have now for reference. 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 configure windows to generate a core dump from an application?

How can I configure windows to generate a core dump from an application? I'm using Win xp, and the application is build with Visual Studio 2003. 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++ - When is a variable odr-used in C++14?

The C++14 draft (N3936) states in §3.2/3: A variable x whose name appears as a potentially-evaluated expression ... , it doesn't make sense. 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 Export Custom Exception

I am currently writing a C++ extension for Python using Boost.Python. A function in this extension may generate an ... may catch it in Python? 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++ - Calculate surface normals from depth image using neighboring pixels cross product

As the title says I want to calculate the surface normals of a given depth image by using the cross product ... make any difference though): 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 does using the same cache-line from multiple threads not cause serious slowdown?

Look at this snippet: #include <atomic> #include <thread> typedef volatile unsigned char Type; // typedef std:: ... ) than the atomic-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++ - stack object Qt signal and parameter as reference

May I have a "dangling reference" with the following code (in an eventual slot connected to the myQtSignal)? ... executed in the same thread. See Question&Answers more detail:os...

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

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210 views

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c++ - What is the purpose of std::scoped_allocator_adaptor?

In the C++11 standard we have std::scoped_allocator_adaptor in the dynamic memory management library. What are the ... use cases of this class? 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++ - Linking with multiple versions of a library

I have an application that statically links with version X of a library, libfoo, from thirdparty vendor, VENDOR1. It ... and the two never mix? 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 determine how many bytes an integer needs?

I'm looking for the most efficient way to calculate the minimum number of bytes needed to store an integer ... which could be comparable. See Question&Answers more detail:os...

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

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