c++-faq Archives - Page 6 of 8

Why use apparently meaningless do-while and if-else statements in macros?

In many C/C++ macros I’m seeing the code of the macro wrapped in what seems like a meaningless do while loop. Here are ...

April 19, 2022
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What is std::move(), and when should it be used?

What is it? What does it do? When should it be used? Good links are appreciated. 8 s 8

April 18, 2022
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Why should C++ programmers minimize use of ‘new’?

I stumbled upon Stack Overflow question Memory leak with std::string when using std::list<std::string>, and one of the comments says this: Stop using new ...

April 16, 2022
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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 is the difference between a definition and a declaration?

The meaning of both eludes me. 25 s 25 A declaration introduces an identifier and describes its type, be it a type, object, ...

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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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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Do the parentheses after the type name make a difference with new?

If ‘Test’ is an ordinary class, is there any difference between: Test* test = new Test; and Test* test = new Test(); 7 ...

April 15, 2022
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What are POD types in C++?

I’ve come across this term POD-type a few times. What does it mean? 9 s 9 POD stands for Plain Old Data – ...

April 14, 2022
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