mathutil.hpp

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#ifndef _MATHUTIL_H
#define _MATHUTIL_H

#include <cstddef>
#include <cstdlib>
#include <iostream>
#include <cmath>
#include <vector>

template <unsigned int N> struct Factorial
{ enum { valeur = N*Factorial<N-1>::valeur};};
template <> struct Factorial<0>
{ enum {valeur =1}; };

double determinant(std::vector<std::vector<double>> det);

inline bool isInteger(char* &s){
    if (s == nullptr)
        return false;
    if (( !isdigit(s[0])) && (s[0] != '-') && (s[0] != '+'))
        return false;
    char *p;
    strtol (s, &p, 10);
    return (*p==0);
}

 template  <unsigned int N>
 inline double Pow(double x)
 {return x*Pow<N-1>(x);}

 template <>
 inline double Pow<0>(double)
 {return 1.0;}

constexpr double pi(){return std::atan(1)*4;}

#endif