xvector2.h

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#pragma once

#include "xerror.h"
#include "xvector1.h"
#include <type_traits>

namespace nmx::gsl::vec {

template<class T>
class IVCalc : public IGslContainer<T, gsl_vector, 2>
{
    using IGslContainer<T, gsl_vector, 2>::gsl;

protected:
    template<class X, class FN>
    inline T &apply_fn(const X &v, FN fn) {
        if constexpr (std::is_same_v<X, double>) {
            fn(gsl(), v); //z.B. gsl_vector_add_constant( , v)
        } else {
            fn(gsl(), v.gsl()); //z.B. gsl_vector_add( , v)
        }
        return static_cast<T &>(*this);
    }

public:
    inline T &operator+=(const T &v) { //
        return apply_fn(v, gsl_vector_add);
    }
    inline T &operator-=(const T &v) { //
        return apply_fn(v, gsl_vector_sub);
    }
    inline T &operator*=(const T &v) { //
        return apply_fn(v, gsl_vector_mul);
    }
    inline T &operator/=(const T &v) { //
        return apply_fn(v, gsl_vector_div);
    }

    inline T &operator+=(double x) { //
        return apply_fn(x, gsl_vector_add_constant);
    }
    inline T &operator-=(double x) { //
        return apply_fn(-x, gsl_vector_add_constant);
    }
    inline T &operator*=(double x) { //
        return apply_fn(x, gsl_vector_scale);
    }

    inline T &operator/=(double x) {
        Check::error_if(nmx_msg, x == 0.0);
        gsl_vector_scale(gsl(), 1 / x);
        return static_cast<T &>(*this);
    }
}; //IVCalc

} // namespace nmx::gsl::vec