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104 linhas
2.2 KiB
104 linhas
2.2 KiB
#pragma once
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#include "gp/ring_list.hpp"
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#include <stddef.h>
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namespace gp {
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class aggregator {
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struct virtual_allocator
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{
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virtual ~virtual_allocator() = default;
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virtual void* allocate(size_t) = 0;
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virtual bool deallocate(void*) = 0;
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virtual bool try_reallocate(void*, size_t) = 0;
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};
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template<typename alloc>
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class abstract_allocator final : public virtual_allocator{
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alloc internal_representation;
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public:
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abstract_allocator(abstract_allocator& v)
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: internal_representation{v.internal_representation}
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{}
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abstract_allocator(alloc& v)
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: internal_representation{v}
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{}
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virtual ~abstract_allocator() override = default;
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virtual void* allocate(size_t sz) override {
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return internal_representation.allocate(sz);
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}
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virtual bool deallocate(void* ptr) override {
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return internal_representation.deallocate(ptr);
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}
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virtual bool try_reallocate(void* ptr, size_t sz) override {
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return internal_representation.try_reallocate(ptr, sz);
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}
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};
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using local_container = ring_list<virtual_allocator, aggregator, false, 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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template<typename bootstrapper>
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aggregator(bootstrapper&& allocator)
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: contents{
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new(allocator.allocate(sizeof(local_container::node)))
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local_container::node(
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new(allocator.allocate(sizeof(bootstrapper))) abstract_allocator(allocator)
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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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template<typename allocator>
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bool insert(allocator&& value) {
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return contents.insert<
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abstract_allocator<
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std::remove_reference_t<
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allocator
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>
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>
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>(abstract_allocator(value));
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}
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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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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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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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