Recent questions tagged C++

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c++ - Return a const reference or a copy in a getter function?

What's better as default, to return a copy (1) or a reference (2) from a getter function? class foo { ... a plain string but rather a vector? 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 algorithms are used in C++11 std::sort in different STL implementations?

The C++11 standard guarantees that std::sort has O(n logn) complexity in the worst case. This is ... :sort implemented in different STLs? 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++ - no debugging symbols found when using gdb

GNU gdb Fedora (6.8-37.el5) Kernal 2.6.18-164.el5 I am trying to debug my application. However, everytime ... if I am missing some simple here? 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++ - char vs wchar_t vs char16_t vs char32_t (c++11)

From what I understand, a char is safe to house ASCII characters whereas char16_t and char32_t are safe to ... ? Clarification would be nice! 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++ - static constexpr variable vs function

Is there a difference between declaring floating point constant as a static constexpr variable and a function as in example ... 3.14f; } } 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's the difference between sizeof and alignof?

What's the difference between sizeof and alignof? #include <iostream> #define SIZEOF_ALIGNOF(T) std::cout<< sizeof(T) ... the alignment is...? 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++ - Problem calling std::max

I compiled my bison-generated files in Visual Studio and got these errors: ...position.hh(83): error C2589: '(' : ... %% ... grammar rules ... 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 it mean to inherit from lambda?

Found this code which looks to be interesting: auto a = [](){}; class B : decltype(a) { }; I want to ... does. Can this be useful in any way? 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 get a value from a map?

I have a map named valueMap as follows: typedef std::map<std::string, std::string>MAP; MAP valueMap; ... ... as a reference to a 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 the [[carries_dependency]] attribute mean?

Can someone explain it in a language that mere mortals understand? 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++ - Where does the word "pragma" come from?

So I know what pragma is, and what it's used for, but what is the meaning of the word itself? I've ... the word actually means or stands for. 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++ - libstdc++.so.6: cannot open shared object file: No such file or directory

I want to run Cilkscreen command with a cilk++ program but I'v got this error /usr/local/cilk/bin/../ ... or directory Can you help me please 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 use std::make_unique in C++17?

As far as I understand, C++14 introduced std::make_unique because, as a result of the parameter evaluation ... preferred to std::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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c++ - How to implement a good debug/logging feature in a project

I am making a smallish project, total of about 3-4 people. I want to have a solid way of debugging the application, ... m not sure how to do 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++ - cpp: usr/bin/ld: cannot find -l<nameOfTheLibrary>

I created a cpp project, which used a lib file named: libblpapi3_64.so This file comes from a library which I ... , it's the original 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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c++ - Windows API dialogs without using resource files

I'm trying to create a dialog box using C++ and the windows API, but I don't want the dialog ... doing anything complicated with it yet. 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 hook up Boost serialization & iostreams to serialize & gzip an object to string?

I've been using the Boost serialization library, which is actually pretty nice, and lets me make simple wrappers to ... you're my only hope!) 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 reference as class members for dependencies

I am going back to C++ after spending some time in memory-managed languages, and I'm suddently kinda lost as to what ... // ... whatever ... }; 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++ - Pimpl idiom without using dynamic memory allocation

we want to use pimpl idiom for certain parts of our project. These parts of the project also happen to ... no external libraries, no templates. 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 cost of a function call?

Compared to Simple memory access Disk access Memory access on another computer(on the same network) Disk access on ... in C++ on windows. 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++ - operator new overloading and alignment

I'm overloading operator new, but I recently hit a problem with alignment. Basically, I have a class IBase ... which type has which alignment. 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++ - Eclipse CDT Autocomplete not working

I remember from some time ago that Eclipse had auto-complete when you type, and now I can only get it when pressing ... back? (Using CDT 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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c++ - what is the difference between function declaration and signature?

In C or C++ what is the difference between function declaration and function signature? I know something of ... used for actually? 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++ - Are there any downsides with using make_shared to create a shared_ptr

Are there any downsides with using make_shared<T>() instead of using shared_ptr<T>(new T). Boost ... efficiency complaints about shared_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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c++ - Building Boost BCP

I was trying to build Boost C++ Libraries for last two hours and stopped without any result. Since I am ... get the above given library 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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c++ - std::this_thread::yield() vs std::this_thread::sleep_for()

What is the difference between C++11 std::this_thread::yield() and std::this_thread::sleep_for()? How to decide when to use which 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++ - How do I utilise all the cores for nmake?

I just got a new quad core computer and noticed that nmake is only using 1 process. I used to use make which ... did it for me. Many 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++ - NULL pointer with boost::shared_ptr?

What's the equivalent to the following: std::vector<Foo*> vec; vec.push_back(NULL); when dealing with boost ... boost::shared_ptr<Foo> nullPtr; See Question&Answers more detail:os...

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

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