growing_buffer.h

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#ifndef GROWING_BUFFER_H
#define GROWING_BUFFER_H
 
#include <cstddef>
#include <vector>
 
class GrowingBuffer {
    public:
        static bool supported();
 
        explicit GrowingBuffer(size_t max_bytes);
        ~GrowingBuffer();
        GrowingBuffer(const GrowingBuffer &) = delete;
        GrowingBuffer & operator=(const GrowingBuffer &) = delete;
 
        void ensure(size_t bytes);
 
        void * data() const { return reinterpret_cast<void *>(base); }
 
    private:
        unsigned long long base = 0;
        [[maybe_unused]] size_t reserved = 0;
        [[maybe_unused]] size_t mapped = 0;
        [[maybe_unused]] size_t granularity = 0;
        [[maybe_unused]] int device = 0;
        std::vector<unsigned long long> handles;
        std::vector<size_t> sizes;  // of each handle's mapping, in address order
};
 
#endif // GROWING_BUFFER_H