Fraction.hh

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#pragma once
 
#include <stdexcept>
#include <string>
#include <type_traits>
 
namespace HEJ {
 
  template<
    class Real,
    typename = std::enable_if_t<std::is_floating_point<Real>::value>
    >
  class Fraction {
  public:
    Fraction() = default;
 
    explicit Fraction(Real r): f_{r} {
      if(f_ < 0 || f_ > 1) {
        throw std::invalid_argument{
          std::to_string(f_) + " is not between 0 and 1"
        };
      }
    }
 
    Fraction & operator=(Real r) {
      f_ = Fraction{r};
      return *this;
    }
 
    operator Real() const {
      return f_;
    }
 
  private:
    Real f_;
  };
} // namespace HEJ