MRXfBasedCache.h

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#pragma once
 
#include "MRAffineXf3.h"
#include <optional>
 
namespace MR
{
 
 
template<class T>
class XfBasedCache
{
public:
    const std::optional<T> & get( const AffineXf3f & xf ) const
    {
        if ( cache_ && xf == xf_ )
            return cache_;
        static const std::optional<T> empty;
        return empty;
    }
    void set( const AffineXf3f & xf, T t )
    {
        xf_ = xf;
        cache_ = std::move( t );
    }
    void reset()
    {
        cache_.reset();
    }
 
private:
    AffineXf3f xf_;
    std::optional<T> cache_;
};
 
}