__GNU_PBDS::CONTAINER_TRAITS(3)

💖 NAME 💖

__gnu_pbds::container_traits< Cntnr > — bestie, it's the Container traits. that's it, that's the whole vibe. it's the little info-desk that tells you what your container can and can't do 💅

so like. this page lives in the Library Functions Manual for libstdc++. it's not a command, it's a template struct in the __gnu_pbds namespace, and it is so useful once you know what it's for 🫶

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✨ SYNOPSIS ✨

okay so first, you gotta pull it in:

#include <tag_and_trait.hpp>

and it's not out here being a lone wolf, no ma'am — it inherits from:

__gnu_pbds::container_traits_base< Cntnr::container_category >

periodt. that's the family tree 💖

🎀 Public Types 🎀

here's the whole squad of public types, and no we are not skipping any of them:

• enum { order_preserving, erase_can_throw, split_join_can_throw, reverse_iteration } — the anonymous enum, four little booleans-of-destiny ✨
• typedef container_traits_base< container_category > base_type — the base, aka where all the inherited stuff comes from 👑
• typedef Cntnr::container_category container_category — the container's own category, handed straight through
• typedef Cntnr container_type — literally just Cntnr, your container type, being itself 🌸
• typedef base_type::invalidation_guarantee invalidation_guarantee — the iterator invalidation guarantee, borrowed from base_type

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🦋 Detailed Description 🦋

okay here's the actual declaration, bestie:

template<typename Cntnr>
    struct __gnu_pbds::container_traits< Cntnr >

and what it is? "Container traits." — that's the description, that's it, that's the whole thing 💀 short and iconic. it's the struct that knows things about Cntnr so you don't have to go find out yourself.

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🌈 Member Enumeration Documentation 🌈

🌟 template<typename Cntnr> anonymous enum 🌟

the anonymous enum! no name, all power 💅 here are its four enumerators, and yes, every single one matters:

• order_preserving — True only if Cntnr objects guarantee storing keys by order. if your container keeps its keys sorted, this one's out here saying yes 👑
• erase_can_throw — True only if erasing a key can throw. like, it might throw. it might not. this flag will tell you fr fr 😭
• split_join_can_throw — True only if split or join operations can throw. those two ops specifically, not just any op, okay? 🫶
• reverse_iteration — True only reverse iterators are supported. (that's the original wording right there, word for word, no notes 🎀) so if you wanna walk your container backwards, vibe check this one first ⭐

careful bestie: these are all about what's guaranteed by Cntnr itself — don't go assuming a True or False means anything beyond exactly what it says 💖

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💜 Author 💜

Generated automatically by Doxygen for libstdc++ from the source code. yes, a robot wrote it, and honestly? it ate 🤖✨

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and that's the whole page, bestie 🫶 this came to you from the libstdc++ manual, filed under the Library Functions Manual, page __gnu_pbds...ts< Cntnr >(3). go forth and trait your containers 💅🌸💖