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Mastering the C++17 STL

You're reading from   Mastering the C++17 STL Make full use of the standard library components in C++17

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787126824
Length 384 pages
Edition 1st Edition
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Author (1):
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Arthur O'Dwyer Arthur O'Dwyer
Author Profile Icon Arthur O'Dwyer
Arthur O'Dwyer
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Table of Contents (13) Chapters Close

Preface 1. Classical Polymorphism and Generic Programming 2. Iterators and Ranges FREE CHAPTER 3. The Iterator-Pair Algorithms 4. The Container Zoo 5. Vocabulary Types 6. Smart Pointers 7. Concurrency 8. Allocators 9. Iostreams 10. Regular Expressions 11. Random Numbers 12. Filesystem

Algorithms that affect object lifetime

The <memory> header provides an obscure family of algorithms with names such as std::uninitialized_copy, std::uninitialized_default_construct, and std::destroy (for the full list, consult an online reference such as cppreference.com). Consider the following algorithm that uses explicit destructor calls to destroy the elements of a range:

    template<class T>
void destroy_at(T *p)
{
p->~T();
}

template<class FwdIt>
void destroy(FwdIt first, FwdIt last)
{
for ( ; first != last; ++first) {
std::destroy_at(std::addressof(*first));
}
}

Notice that std::addressof(x) is a convenient little helper function that returns the address of its parameter; it's exactly the same thing as &x except in the rare case that x is of some class type that sadistically overloads its own operator...

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