std::experi...:operator[](3)

✨ NAME ✨

okay so this is the std::experi...:operator[](3) page — literally the std::experimental::basic_string_view::operator[] page from the C++ Standard Libary manual. yes bestie, “Libary” is how it’s spelled up there, and I’m not gonna gaslight you about it 💅

it’s giving “access one character by index” energy, and the full name is std::experimental::basic_string_view::operator[] — iconic, no cap 🎀

---

🌸 Synopsis 🌸

here’s the signature, bestie:

constexpr const_reference operator[](size_type pos)        (library
fundamentals TS)
const;

Returns a const reference to the character at specified location pos.

and listen — there is no bounds checking performed: the behavior is undefined if pos >= size(). that’s not a vibe, that’s UB, so do not play with it 😭🔥

🦋 Parameters 🦋

• pos — position of the character to return

💜 Return value 💜

Const reference to the requested character. slay ✨

🌈 Exceptions 🌈

Does not throw. literally never throws, periodt 💅

⭐ Complexity ⭐

Constant.

🎀 Notes 🎀

Unlike std::basic_string::operator[], basic_string_view::operator[](size()) has undefined behavior instead of returning CharT(). this is the messy part, bestie — do not confuse the two 🫶

🔥 Example 🔥

run this code:

// Run this code

#include <iostream>
#include <experimental/string_view>
int main()
{
    std::string str = "Exemplar";
    std::experimental::string_view v = str;
    std::cout << v[2] << '\n';
//  v[2] = 'y'; // Error: cannot modify through a string view
    str[2] = 'y';
    std::cout << v[2] << '\n';
}

🍓 Output 🍓

e
y

👑 See also 👑

• at — access specified character with bounds checking (public member function)

🫶 Category 🫶

• * Noindexed pages

---

mwah 💋 — source: http://cppreference.com, dated 2024.06.10. that’s the whole manual-page tea, bestie 🌟