__GNU_CXX::SELECT1ST(3)

💖 NAME 💖

__gnu_cxx::select1st< _Pair > — bestie, it's an SGI extension. That's the whole vibe. 🦋

This page lives in the Library Functions Manual, section 3, so yes we are deep in library-functions territory, iykyk.

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✨ SYNOPSIS ✨

#include <functional>

That's it, that's the include. Slap it in and you're in business. 🎀

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🌸 Public Types 🌸

• typedef _Pair argument_type — literally the type of the argument. That's what it is. That's what it does.
• typedef _Pair::first_type result_type — and this one? The type of the return. Iconic behaviour, no notes.

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💅 Public Member Functions 💅

• _Pair::first_type & operator() (_Pair &__x) const — call operator, takes a _Pair&, hands you back a _Pair::first_type &.
• template<typename _Pair2> _Pair2::first_type & operator() (_Pair2 &__x) const — the templated glow-up version, same deal but with _Pair2.
• const _Pair::first_type & operator() (const _Pair &__x) const — const-flavoured, returns a const _Pair::first_type &.
• template<typename _Pair2> const _Pair2::first_type & operator() (const _Pair2 &__x) const — templated and const. The full main character package. 👑

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🌈 Detailed Description 🌈

template<class _Pair>
    struct __gnu_cxx::select1st< _Pair >

"An SGI extension ."

Yeah bestie. That's the description. Short, sweet, an SGI extension. 💀

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🧚 Member Typedef Documentation 🧚

• typedef _Pair std::unary_function< _Pair, _Pair::first_type >::argument_type — [inherited] — argument_type is the type of the argument. She got it from her parent std::unary_function< _Pair, _Pair::first_type >, as one does.
• typedef _Pair::first_type std::unary_function< _Pair, _Pair::first_type >::result_type — [inherited] — result_type is the return type. Also inherited, also serving exactly what it says on the tin. 💜

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⭐ Author ⭐

Generated automatically by Doxygen for libstdc++ from the source code. Not a human author, just a robot doing its little robot thing. 🤖✨

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Okay that's the whole page, bestie! Quick sign-off so you know where this came from: this is libstdc++'s page __gnu_cxx:...st< _Pair >(3), and that's the date/version energy it shipped with. Go forth and select1st responsibly. 🫶💖