__GNU_CXX::CONSTANT_UNARY_FUN(3)

🌸 __gnu_cxx::constant_unary_fun< _Result, _Argument > 🌸

okay bestie, gather round, we're reading a Library Functions Manual page today and honestly? it's giving ✨ niche but iconic ✨. this one lives in the __gnu_cxx namespace and it's an SGI extension, periodt.

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💖 NAME 💖

__gnu_cxx::constant_unary_fun< _Result, _Argument > — an SGI extension.

that's it. that's the whole name. she's long, she's templated, she's lowkey the moment 💅

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🎀 SYNOPSIS 🎀

first things first, you gotta let the compiler know she exists:

#include <functional>

that's the whole vibe check, no cap.

🌈 Public Types 🌈

• typedef _Argument argument_type — this is the type of the thing you hand her. the input girlie.
• typedef _Result result_type — and this is the type she gives back. the output girlie.

🦋 Public Member Functions 🦋

• constant_unary_fun (const _Result &__v) — the constructor. you hand her a _Result by const reference and she tucks it away. that's the whole personality ngl.
• const result_type & operator() (const _Argument &) const — the call operator. hand her an _Argument and she hands you back a const reference to the result_type. note that the argument she takes? yeah, she literally does not look at it. it's giving "not me ignoring my input 💀". but it's const, so she's well-behaved about it.

🍓 Public Attributes 🍓

• result_type _M_val — the stash. this is where the constant lives. the whole point of the whole struct. main character energy right there 👑

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💜 Detailed Description 💜

here's the actual shape of her:

template<class _Result, class _Argument = _Result>
    struct __gnu_cxx::constant_unary_fun< _Result, _Argument >

"An SGI extension."

and yes, _Argument defaults to _Result if you don't say otherwise — she's flexible like that 🫶

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⭐ Author ⭐

Generated automatically by Doxygen for libstdc++ from the source code. (so like, a robot wrote this, but make it fashion 🤖💅)

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okay that's the whole page, you ate it, I'm obsessed 💖

quick reminder bestie: she's an SGI extension, so she's not standard-standard, iykyk. don't go treating her like portable C++ without checking first 🙈

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this lil page is part of the libstdc++ manual — yeah the GCC C++ standard library one, the Library Functions Manual girlies 💜 — and that's the whole tour. mwah, go compile something cute 🎀✨