std::revers...erator::base(3)

💅 std::reverse_iterator::base 💅

okay bestie, welcome to the C++ Standard Library manual page for std::reverse_iterator::base — yes, the whole manual name is getting folded in right here at the top like a little name tag 🫶

---

✨ NAME ✨

std::reverse_iterator::base — std::reverse_iterator::base

---

📖 Synopsis 📖

iterator_type base() const;            (until C++17)
constexpr iterator_type base() const;  (since C++17)

Returns the underlying base iterator. That is std::reverse_iterator(it).base() == it.

The base iterator refers to the element that is next (from the std::reverse_iterator::iterator_type perspective) to the element the reverse_iterator is currently pointing to. That is &*(rit.base() - 1) == &*rit.

---

🌸 Parameters 🌸

(none)

---

🎀 Return value 🎀

The underlying iterator.

---

💀 Exceptions 💀

May throw implementation-defined exceptions.

---

🦋 Example 🦋

// Run this code

#include <iostream>
#include <iterator>
#include <vector>

int main()
{
    std::vector<int> v = {0, 1, 2, 3, 4, 5};

    using RevIt = std::reverse_iterator<std::vector<int>::iterator>;

    const auto it = v.begin() + 3;
    RevIt r_it{it};

    std::cout << "*it == " << *it << '\n'
              << "*r_it == " << *r_it << '\n'
              << "*r_it.base() == " << *r_it.base() << '\n'
              << "*(r_it.base()-1) == " << *(r_it.base() - 1) << '\n';

    RevIt r_end{v.begin()};
    RevIt r_begin{v.end()};

    for (auto it = r_end.base(); it != r_begin.base(); ++it)
        std::cout << *it << ' ';
    std::cout << '\n';

    for (auto it = r_begin; it != r_end; ++it)
        std::cout << *it << ' ';
    std::cout << '\n';
}

🌈 Output 🌈

*it == 3
*r_it == 2
*r_it.base() == 3
*(r_it.base()-1) == 2
0 1 2 3 4 5
5 4 3 2 1 0

---

👑 See also 👑

• operator* — accesses the pointed-to element
• operator-> — (public member function)

---

byeee bestie 💖 this page’s source/version is http://cppreference.com, dated 2024.06.10 — go slay some iterators ✨