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_SAMPLER_EXACT_H_
#define MUI_SAMPLER_EXACT_H_
 
#include <limits>
#include "../../config.h"
#include "../sampler.h"
 
namespace mui {
 
template<typename CONFIG=default_config, typename O_TP=typename CONFIG::REAL, typename I_TP=O_TP>
class sampler_exact {
public:
    using OTYPE      = O_TP;
    using ITYPE      = I_TP;
    using REAL       = typename CONFIG::REAL;
    using INT        = typename CONFIG::INT;
    using point_type = typename CONFIG::point_type;
 
    static const bool QUIET = CONFIG::QUIET;
 
    sampler_exact( REAL tol = std::numeric_limits<REAL>::epsilon() ) {
        int exponent;
        frexp10<REAL>( std::numeric_limits<REAL>::max(), exponent );
        real_precision = static_cast<REAL>( exponent );
        tolerance = tol;
        point_tolerance = tolerance*real_precision;
    }
 
    template<template<typename,typename> class CONTAINER>
    inline OTYPE filter( point_type focus, const CONTAINER<ITYPE,CONFIG> &data_points ) const {
      for( size_t i = 0 ; i < data_points.size() ; i++ ) {
            if ( norm( focus - data_points[i].first ) < point_tolerance ) {
                return data_points[i].second;
            }
        }
 
        if( !QUIET )
            std::cout << "MUI Warning [sampler_exact.h]: Hit nothing, check sampling location..." << std::endl;
 
        return OTYPE();
    }
 
    inline geometry::any_shape<CONFIG> support( point_type focus, REAL domain_mag ) const {
        return geometry::sphere<CONFIG>( focus, tolerance*domain_mag*real_precision );
    }
 
protected:
        REAL tolerance;
        REAL point_tolerance;
        REAL real_precision;
};
 
}
 
#endif /* MUI_SAMPLER_EXACT_H_ */