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87 regels
1.9 KiB
87 regels
1.9 KiB
#pragma once
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#include "gp/ring_list.hpp"
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#include "gp/allocator/allocator.hpp"
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#include <stddef.h>
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namespace gp {
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class aggregator : public allocator {
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using local_container = ring_list<allocator, true>;
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local_container contents;
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local_container::explorer mark;
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public:
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/**
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* @brief Construct a new aggregator object from a bootstraping allocator
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*
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* @tparam bootstrapper the type of allocator pushed in
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* @param allocator_v the allocator moved inside the new aggregator
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*/
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template<typename bootstrapper>
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aggregator(bootstrapper&& allocator_v)
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: contents{
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new(allocator_v.allocate(sizeof(local_container::node)))
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local_container::node(
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new(allocator_v.allocate(sizeof(bootstrapper))) std::remove_reference_t<bootstrapper>(gp::forward<bootstrapper&&>(allocator_v))
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),
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*this
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}
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, mark{contents.explore()}
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{}
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/**
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* @brief inserts a new allocator within the aggregator
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*
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* @tparam s_allocator the type of newly inserted allocator
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* @param value the inserted allocator
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* @return true if the insertion was successful
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* @return false if the insertion failed and the allocator is lost to the abyss of time
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*/
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template<typename s_allocator>
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bool insert(s_allocator&& value) {
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return contents.insert<
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std::remove_reference_t<
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s_allocator
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>
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>(gp::forward<s_allocator>(value));
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}
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virtual void* allocate(size_t sz) {
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auto cpy = mark;
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do{
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if(auto allocated = (*mark).allocate(sz))
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{
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return allocated;
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}
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++mark;
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}while(cpy != mark);
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return nullptr;
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}
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virtual bool deallocate(void* ptr) {
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auto cpy = mark;
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do{
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if((*cpy).deallocate(ptr))
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{
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return true;
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}
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--cpy;
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}while(cpy != mark);
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return false;
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}
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virtual bool try_reallocate(void* ptr, size_t sz) {
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auto cpy = mark;
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do{
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if((*cpy).try_reallocate(ptr, sz))
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{
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return true;
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}
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--cpy;
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}while(cpy != mark);
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return false;
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}
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};
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}
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