c++-faq Archives - Page 3 of 8

Does C++ support ‘finally’ blocks? (And what’s this ‘RAII’ I keep hearing about?)

Does C++ support ‘finally‘ blocks? What is the RAII idiom? What is the difference between C++’s RAII idiom and C#’s ‘using’ statement? 16 ...

May 16, 2022
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What is the purpose of std::launder?

P0137 introduces the function template std::launder and makes many, many changes to the standard in the sections concerning unions, lifetime, and pointers. What ...

May 15, 2022
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When is std::weak_ptr useful?

I started studying smart pointers of C++11 and I don’t see any useful use of std::weak_ptr. Can someone tell me when std::weak_ptr is ...

May 15, 2022
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Why should I always enable compiler warnings?

I often hear that when compiling C and C++ programs I should “always enable compiler warnings”. Why is this necessary? How do I ...

May 13, 2022
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How to implement classic sorting algorithms in modern C++?

The std::sort algorithm (and its cousins std::partial_sort and std::nth_element) from the C++ Standard Library is in most implementations a complicated and hybrid amalgamation ...

May 13, 2022
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What is a “span” and when should I use one?

Recently I’ve gotten suggestions to use span<T>‘s in my code, or have seen some answers here on the site which use span‘s – ...

May 12, 2022
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Can a class member function template be virtual?

I have heard that C++ class member function templates can’t be virtual. Is this true? If they can be virtual, what is an ...

May 11, 2022
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What XML parser should I use in C++? [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question ...

May 10, 2022
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Why should I not #include ?

I posted a question with my code whose only #include directive was the following: #include <bits/stdc++.h> My teacher told me to do this, ...

May 9, 2022
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Is the practice of returning a C++ reference variable evil?

This is a little subjective I think; I’m not sure if the opinion will be unanimous (I’ve seen a lot of code snippets ...

May 9, 2022
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