temporal_sampler_exact.h

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/*****************************************************************************
* Multiscale Universal Interface Code Coupling Library                       *
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* Copyright (C) 2019 Y. H. Tang, S. Kudo, X. Bian, Z. Li, G. E. Karniadakis  *
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#ifndef MUI_TEMPORAL_SAMPLER_EXACT_H_
#define MUI_TEMPORAL_SAMPLER_EXACT_H_
 
#include <limits>
#include "../../general/util.h"
#include "../../config.h"
 
namespace mui {
 
template<typename CONFIG=default_config> class temporal_sampler_exact {
public:
    using REAL          = typename CONFIG::REAL;
    using INT           = typename CONFIG::INT;
    using time_type     = typename CONFIG::time_type;
    using iterator_type = typename CONFIG::iterator_type;
 
    temporal_sampler_exact( time_type tol = time_type(std::numeric_limits<time_type>::epsilon()) ) {
      int exponent;
      frexp10<time_type>( std::numeric_limits<time_type>::max(), exponent );
      time_type real_precision_time = static_cast<time_type>( exponent );
      iterator_type real_precision_it = static_cast<iterator_type>( exponent );
      tolerance_time = tol*real_precision_time;
      tolerance_it = tol*real_precision_it;
    }
 
    //- Filter based on time input
    template<typename TYPE>
    TYPE filter( time_type focus, const std::vector<std::pair<std::pair<time_type,iterator_type>, TYPE> > &points ) const {
        for( auto i: points ) {
            time_type dt = std::abs(i.first.first - focus);
            if ( dt <= tolerance_time ) {
                return i.second;
            }
        }
 
        return TYPE();
    }
 
    //- Filter based on time and iterator input - both used
    template<typename TYPE>
    TYPE filter( std::pair<time_type,iterator_type> focus, const std::vector<std::pair<std::pair<time_type,iterator_type>, TYPE> > &points ) const {
        for( auto i: points ) {
            time_type dt = std::abs(i.first.first - focus.first);
            iterator_type di = std::abs(i.first.second - focus.second);
            if ( dt <= tolerance_time && di <= tolerance_it ) {
                return i.second;
            }
        }
 
        return TYPE();
    }
 
    template<typename TYPE>
    TYPE get_upper_bound( TYPE focus ) const {
        return focus;
    }
 
    template<typename TYPE>
    TYPE get_lower_bound( TYPE focus ) const {
        return focus;
    }
 
private:
    time_type tolerance_time;
    time_type tolerance_it;
};
 
}
 
#endif /* MUI_TEMPORAL_SAMPLER_EXACT_H_ */