block_allocator.h

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#pragma once
 
#include <memory>
 
#include "contur/core/error.h"
 
namespace contur {

    class BlockAllocator final
    {
        public:
        explicit BlockAllocator(std::size_t totalBlocks);
        ~BlockAllocator();
 
        BlockAllocator(const BlockAllocator &) = delete;
        BlockAllocator &operator=(const BlockAllocator &) = delete;
        BlockAllocator(BlockAllocator &&) noexcept;
        BlockAllocator &operator=(BlockAllocator &&) noexcept;

        [[nodiscard]] Result<std::size_t> allocate();

        [[nodiscard]] Result<void> free(std::size_t blockIndex);

        [[nodiscard]] bool isFree(std::size_t blockIndex) const noexcept;

        [[nodiscard]] std::size_t totalBlocks() const noexcept;

        [[nodiscard]] std::size_t freeBlocks() const noexcept;

        void reset();
 
        private:
        struct Impl;
        std::unique_ptr<Impl> impl_;
    };
 
} // namespace contur