47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
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#pragma once
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#include <vector>
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#include <cstddef>
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#include <cstdint>
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#include <memory>
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#include <utility>
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namespace pdfengine {
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class LayoutArena {
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public:
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explicit LayoutArena(size_t blockSizeBytes = 65536);
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~LayoutArena();
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// Disable copy
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LayoutArena(const LayoutArena&) = delete;
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LayoutArena& operator=(const LayoutArena&) = delete;
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// Enable move
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LayoutArena(LayoutArena&&) noexcept;
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LayoutArena& operator=(LayoutArena&&) noexcept;
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template <typename T, typename... Args>
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T* allocate(Args&&... args) {
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void* mem = allocateBytes(sizeof(T), alignof(T));
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return ::new (mem) T(std::forward<Args>(args)...);
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}
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void* allocateBytes(size_t size, size_t alignment = alignof(std::max_align_t));
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void clear() noexcept;
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[[nodiscard]] size_t totalAllocatedBytes() const noexcept;
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private:
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struct Chunk {
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std::unique_ptr<uint8_t[]> data;
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size_t size = 0;
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size_t used = 0;
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};
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size_t m_defaultChunkSize = 65536;
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std::vector<Chunk> m_chunks;
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size_t m_totalAllocated = 0;
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};
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} // namespace pdfengine
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