Recent questions tagged C++

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c++ - Emacs cc-mode indentation problem with C++0x enum class

Emacs cc-mode does not appear to yet recognize the type-safe enum class introduced in C++0x. The result I get ... it treats the plain old enum? 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 C++11 atomic<T> usable with mmap?

I want to add network control of a handful of parameters used by a service (daemon) running on a Linux embedded ... the C++11 atomic types. 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 does std::declval<T>() work?

I am trying to understand how std::declval<T>() works. I know how to use it, and know what it does, mainly ... the old trick (*(T*)(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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c++ - Difference between vector::begin() and std::begin()

While iterating over a vector in c++, I noticed there is a begin() function in the standard library, and also a begin() ... cout << *i << ' '; 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 defined a non-copy constructor; will a copy constructor still be implicitly defined?

Can the (implicit)default copy constructor be called for a class that has already user-defined constructor ... default constructor be called? 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 to use `short` over `int`?

There are many questions that asks for difference between the short and int integer types in C++, but practically ... you choose short over int? 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 link against boost.system with cmake

I use a cmake generated makefile to compile a c++ file that depends on the boost filesystem library. During the ... , current version 111.0.0) 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++ - HSB vs HSL vs HSV

I am making a Color class as a part of a very basic graphics API in c++. So I decided to take a look ... can someone show me the FASTEST ones? 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++ - Passing unique_ptr to functions

I'm trying to "modernize" some existing code. I have a class which currently has a member variable "Device* ... I missed any other options? 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 hash_map and unordered_map?

I recently discovered that the implementation of the hash map in C++ will be called unordered_map. ... hash_map that unordered_map resolves. 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::ostringstream vs std::string::append

In all examples that use some kind of buffering I see they use stream instead of string. How is std:: ... should be less resource hungry. 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 possible to use boost::foreach with std::map?

I find boost::foreach very useful as it saves me a lot of writing. For example, let's say I want to ... with types such as vector or string. 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 remove "const" in front of "primitive" types used as function parameters in the header?

In the code review process, one of my coworkers mentioned to me that "const"s in front of "primitive types" ... anyone give some advice on 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++ - Preferred standard use: range based for or std::for_each

In C++11, there are two loops over all elements (range based for and for_each). Is there any reason to ... more similar to other std-algorithms. 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 split string

I'm using the boost::split method to split a string as this: I first make sure to include the correct ... " covered the first string somehow. 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 delete elements of a std::map with an iterator?

I would like to loop through an std::map and delete items based on their contents. How best would this be done? 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 Add Linux Executable Files to .gitignore?

How do you add linux executable files to .gitignore without giving them an explicit extension and without placing them ... the ".c" extension. 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++ - Boolean in ifdef: is "#ifdef A && B" the same as "#if defined(A) && defined(B)"?

In C++, is this: #ifdef A && B the same as: #if defined(A) && defined(B) ? I was thinking it ... find a difference with my compiler (VS2005). 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 the definition of "volatile" this volatile, or is GCC having some standard compliancy problems?

I need a function that (like SecureZeroMemory from the WinAPI) always zeros memory and doesn't get optimized away, ... of zwol's answer.) 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++ - Incomplete type is not allowed: stringstream

Why does this line give the error Error: incomplete type is not allowed? stringstream ss; 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++ - Create linux make/build file

I am moving a C++ project from Windows to Linux and I now need to create a build/make file. I have never ... with Boost in Linux without an IDE. 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++ - Objects vs instance in python

In C++ there are just objects and classes, where objects are instances of classes. In Python, a class ... + object). Please refer 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++ - WinAPI: Create resizable window without title bar, but with minimize/maximize/close buttons (as Firefox/Chrome/Opera)

If you look at the windows of the browsers Firefox, Chrome or Opera, you'll notice that their windows have minimize/ ... . So what is to do? 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++ - Number of bits set in a number

The following the magical formula which gives the number of bits set in a number (Hamming weight). /*Code to ... me the rationale behind 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++ - boost::asio::socket thread safety

( This is a simplified version of my original question ) I have several threads that write to a boost asio socket ... going to worry about 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++ - read input separated by whitespace(s) or newline...?

I'm grabbing input from a standard input stream. Such as, 1 2 3 4 5 or 1 2 3 4 5 I'm using: std: ... s) using only iosteam, string, and cstdlib? 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 wrap calls of every member function of a class in C++11?

Herb Sutter asked this question in a talk about C++11 and concurrency (See this video) The key idea here is to have a ... "; s += "barfoo"; }); 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 would a virtual function be private?

I just spotted this in some code: class Foo { [...] private: virtual void Bar() = 0; [...] } Does this ... to G++, and this caught my attention) See Question&Answers more detail:os...

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

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