__gnu_cxx::__pool_alloc_base(3cxx)

💅 __gnu_cxx::__pool_alloc_base(3cxx) — the libstdc++ manual, but make it make sense

okay so welcome to the libstdc++ page for __gnu_cxx::__pool_alloc_base, bestie. It's the base-class icon behind __pool_alloc, and we're gonna get into it. 🫶

✨ NAME ✨

__gnu_cxx::__pool_alloc_base — Base class for __pool_alloc. periodt.

🌸 SYNOPSIS 🌸

pull it in with:

#include <pool_allocator.h>

also inherited by __gnu_cxx::__pool_alloc< _Tp > [private]. iykyk. 💅

🎀 Protected Types 🎀

these are the protected type members, no cap:

• enum { _S_align }
• enum { _S_max_bytes }
• enum { _S_free_list_size }

🔥 Protected Member Functions 🔥

the protected member functions, exactly as they appear:

• char * _M_allocate_chunk (size_t __n, int &__nobjs)
• _Obj *volatile * _M_get_free_list (size_t __bytes) throw ()
• __mutex & _M_get_mutex () throw ()
• void * _M_refill (size_t __n)
• size_t _M_round_up (size_t __bytes)

🦋 Static Protected Attributes 🦋

static protected attributes, slay:

• static char * _S_end_free
• static _Obj *volatile _S_free_list [_S_free_list_size]
• static size_t _S_heap_size
• static char * _S_start_free

💖 Detailed Description 💖

so __gnu_cxx::__pool_alloc_base is the Base class for __pool_alloc. It uses various allocators to fulfill underlying requests, and it makes as few requests as possible when it's in default high-speed pool mode. obsessed.

the important implementation properties are literally:

• 0. If it's globally mandated, then objects get allocated from new.
• 1. If the clients request an object of size > _S_max_bytes, that resulting object is obtained directly from new.
• 2. In every other case, we allocate an object of size exactly _S_round_up(requested_size). That way the client has enough size information for us to return the object to the proper free list without permanently losing part of the object.

📜 Author 📜

Generated automatically by Doxygen for libstdc++ from the source code. iconic behavior, honestly.

---

and that's the whole page, bestie 🧚 the footer/source line is libstdc++ + __gnu_cxx::__pool_alloc_base(3cxx) — that's the source/version bit, and there's no date shown on this page, just that footer energy. 🫶💖