abstract_limiter.hh

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#pragma once
 
// standard library
#include <concepts>
 
namespace DiFfRG
{
  namespace def
  {
    template <typename T>
    concept HasSlopeLimiter = requires(double a, double b) {
      { T::slope_limit(a, b) } -> std::convertible_to<double>;
    };
 
    namespace limiter_utils
    {
      template <typename T> int sgn(T val) { return (T{} < val) - (val < T{}); }
    } // namespace limiter_utils
 
  } // namespace def
} // namespace DiFfRG