xvector1.h

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#pragma once

#include "xfmt.h"
#include "xoutput.h"
#include "xvector0.h"
#include <gsl/gsl_vector.h>
#include <ostream>

namespace nmx::gsl::vec {

template<class T>
class IVBase : public IGslContainer<T, gsl_vector, 1>
{
    // benutze Elementfunktionen der Basisklasse
    using IGslContainer<T, gsl_vector, 1>::gsl;

public:
    inline size_t size() const { //
        try {
            return gsl()->size;
        } catch (...) {
            // wenn kein Speicher angefordert wurde
            return 0;
        }
    }

    double operator[](size_t idx) const { //
        return *gsl_vector_const_ptr(gsl(), idx);
    }

    double &operator[](size_t idx) { //
        return *gsl_vector_ptr(gsl(), idx);
    }

    inline void save(std::ostream &os, Format fmt = Output::array()) const {
        //schreibe erstes Element z.B. x0...
        os << gsl_vector_get(gsl(), 0);
        for (size_t idx = 1; idx < size(); idx++) {
            //... ,x1,x2,...
            os << fmt.sep() << gsl_vector_get(gsl(), idx);
        }
        os << fmt.lend();
    }

    inline friend std::ostream &operator<<(std::ostream &os, const T &p) {
        p.save(os);
        return os;
    }

    template<class FN>
    inline T &transform(FN fn) {
        for (size_t idx = 0; idx < size(); idx++) {
            double val = gsl_vector_get(gsl(), idx);
            gsl_vector_set(gsl(), fn(val), idx);
        }
        return static_cast<T &>(*this);
    }
}; //IVBase

} // namespace nmx::gsl::vec