last_n.h

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#pragma once
 
 
 
#include "assert/assert.h"
#include "base/cint.h"
 
namespace eu::core
{
    // stores the "last N" values of some type, where N is configurable
    template <typename T>
    struct LastN
    {
        std::vector<T> d;
        std::size_t max;
 
        explicit LastN(std::size_t s) : max(s) {}
 
        void
        push(const T& t)
        {
            if(d.size() == max)
            {
                d.erase(d.begin());
            }
            d.push_back(t);
        }
 
        [[nodiscard]] const T*
        data() const
        {
            ASSERT(!d.empty());
            return d.data();
        }
 
        [[nodiscard]] int
        size() const
        {
            return c_sizet_to_int(d.size());
        }
    };
}