ParticlePool.hpp

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#pragma once
 
#include <array>
#include <concepts>
#include <cstdint>
 
template <typename T, uint32_t MaxN>
struct ParticlePool
{
    std::array<T, MaxN> data{};
    uint32_t count = 0;
 
    T* spawn()
    {
        if (count >= MaxN)
            return nullptr;
        data[count] = T{};
        return &data[count++];
    }
 
    void kill(uint32_t i) { data[i] = data[--count]; }
 
    void update(auto fn)
    {
        for (uint32_t i = count; i-- > 0;)
            if (!fn(data[i]))
                kill(i);
    }
 
    [[nodiscard]] const T* rawData() const { return data.data(); }
    [[nodiscard]] uint32_t liveCount() const { return count; }
    [[nodiscard]] bool empty() const { return count == 0; }
    [[nodiscard]] bool full() const { return count >= MaxN; }
};