z3-z3-4.13.0.src.math.lp.column_namer.h Maven / Gradle / Ivy

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#pragma once
/*++
Copyright (c) 2017 Microsoft Corporation

Module Name:

    

Abstract:

    

Author:

    Lev Nachmanson (levnach)

Revision History:


--*/
#include 
#include "math/lp/static_matrix.h"
namespace lp {
class column_namer {
public:
    virtual ~column_namer() = default;
    virtual std::string get_variable_name(unsigned j) const = 0;
    template 
    std::ostream & print_row(const row_strip & row, std::ostream & out) const {
        vector> coeff;
        for (auto & p : row) {
            coeff.push_back(std::make_pair(p.coeff(), p.var()));
        }
        print_linear_combination_of_column_indices(coeff, out);
        return out;
    }
    
    template 
    void print_linear_combination_of_column_indices(const vector> & coeffs, std::ostream & out) const {
        bool first = true;
        for (const auto & it : coeffs) {
            auto val = it.first;
            if (first) {
                first = false;
            } else {
                if (numeric_traits::is_pos(val)) {
                    out << " + ";
                } else {
                    out << " - ";
                    val = -val;
                }
            }
            if (val == -numeric_traits::one())
                out << " - ";
            else if (val != numeric_traits::one())
                out << val;
        
            out << get_variable_name(it.second);
        }
    }

};
}