C++ Archives - Page 63 of 68

What does T&& (double ampersand) mean in C++11?

I’ve been looking into some of the new features of C++11 and one I’ve noticed is the double ampersand in declaring variables, like ...

April 16, 2022
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What are C++ functors and their uses?

I keep hearing a lot about functors in C++. Can someone give me an overview as to what they are and in what ...

April 16, 2022
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push_back vs emplace_back

I’m a bit confused regarding the difference between push_back and emplace_back. void emplace_back(Type&& _Val); void push_back(const Type& _Val); void push_back(Type&& _Val); As there ...

April 16, 2022
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What are the rules about using an underscore in a C++ identifier?

It’s common in C++ to name member variables with some kind of prefix to denote the fact that they’re member variables, rather than ...

April 16, 2022
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What are the new features in C++17?

This question’s answers are a community effort. Edit existing answers to improve this post. It is not currently accepting new answers or interactions. ...

April 16, 2022
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How to convert a std::string to const char* or char*

How can I convert an std::string to a char* or a const char*? 10 s 10 If you just want to pass a ...

April 15, 2022
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Undefined behavior and sequence points

What are “sequence points”? What is the relation between undefined behaviour and sequence points? I often use funny and convoluted expressions like a...

April 15, 2022
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What is the difference between g++ and gcc?

What is the difference between g++ and gcc? Which one of them should be used for general c++ development? 10 s 10

April 15, 2022
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Why can’t variables be declared in a switch statement?

I’ve always wondered this – why can’t you declare variables after a case label in a switch statement? In C++ you can declare ...

April 15, 2022
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Can I call a constructor from another constructor (do constructor chaining) in C++?

As a C# developer I’m used to running through constructors: class Test { public Test() { DoSomething(); } public Test(int count) : this() ...

April 15, 2022
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