std::list::append_range(3)

💖 std::list::append_range(3) 💖

okay bestie, welcome to the C++ Standard Libary manual — yes, the header spells it “Libary” and we are respecting the lore. This page is all about std::list::append_range, and she is lowkey iconic. 💅

🌸 NAME 🌸

• std::list::append_range — that’s literally the name: std::list::append_range.

✨ Synopsis ✨

template< container-compatible-range<T> R >  (since C++23)
void append_range( R&& rg );

Inserts copies of elements from the range rg before end(), in non-reversing order.

No iterators or references are invalidated.

Each iterator in rg is dereferenced exactly once.

💅 Parameters 💅

• rg — a container compatible range, that is, an input_range whose elements are convertible to T.

🧚 Type requirements 🧚

• T must be EmplaceConstructible into list from *ranges::begin(rg). Otherwise, the behavior is undefined.

🫶 Return value 🫶

(none) — literally nothing, bestie. No notes.

📏 Complexity 📏

Linear in size of rg. The number of calls to the constructor of T is exactly equal to the std::ranges::size(rg)).

🚨 Exceptions 🚨

If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee). Periodt. 🛡️

🧠 Notes 🧠

Feature-test macro:

• __cpp_lib_containers_ranges — value 202202L, Std (C++23), feature: Ranges-aware construction and insertion.

🍓 Example 🍓

// Run this code

#include <algorithm>
#include <cassert>
#include <list>
#include <vector>

int main()
{
    auto head = std::list{1, 2, 3, 4};
    const auto tail = std::vector{-5, -6, -7};
#ifdef __cpp_lib_containers_ranges
    head.append_range(tail);
#else
    head.insert(head.end(), tail.cbegin(), tail.cend());
#endif
    assert(std::ranges::equal(head, std::list{1, 2, 3, 4, -5, -6,
       -7}));
}

👑 See also 👑

• prepend_range — adds a range of elements to the beginning (C++23) (public member function).
• insert_range — inserts a range of elements (C++23) (public member function).
• push_back — adds an element to the end (public member function).
• emplace_back — constructs an element in-place at the end (C++11) (public member function).

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source/version: cppreference.com, 2024.06.10. k bye bestie, go append that range responsibly. 💖✨🎀