pool.h

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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef INKSCAPE_UTIL_POOL_H
#define INKSCAPE_UTIL_POOL_H
 
#include <algorithm>
#include <cstddef>
#include <memory>
#include <utility>
#include <vector>
 
namespace Inkscape::Util {
 
class Pool final
{
public:
    Pool() = default;
    Pool(Pool const &) = delete;
    Pool &operator=(Pool const &) = delete;
    Pool(Pool &&other) noexcept { movefrom(other); }
    Pool &operator=(Pool &&other) noexcept { movefrom(other); return *this; }
 
    void reserve(std::size_t size) { nextsize = std::max(nextsize, size); }
 
    std::byte *allocate(std::size_t size, std::size_t alignment);
 
    template<typename T>
    T *allocate() { return reinterpret_cast<T*>(allocate(sizeof(T), alignof(T))); }
 
    void free_all() noexcept;
 
private:
    std::vector<std::unique_ptr<std::byte[]>> buffers;
    std::byte *cur = nullptr, *end = nullptr;
    std::size_t cursize = 0, nextsize = 2;
 
    void movefrom(Pool &other) noexcept;
    void resetblock() noexcept;
};
 
} // namespace Inkscape::Util
 
#endif // INKSCAPE_UTIL_POOL_H
 
/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim:filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99: