odm/include/traits.h

#pragma once
#include "ParseArgs.h"
#include <concepts>

class BaseParameters;
using michlib::real;

template<class T>
concept InfoSupported = requires(T t) {
 {
  t.Info()
 } -> std::convertible_to<MString>;
};

template<class T>
concept ParametersRequiredRegion = requires(T t, michlib_internal::ParameterListEx& pars, const CLArgs& args, const struct Region& r) {
 {
  t.Parameters(pars, args, r).first
 } -> std::convertible_to<const BaseParameters*>;
};

template<class T>
concept ParametersNotRequiredRegion = requires(T t, michlib_internal::ParameterListEx& pars, const CLArgs& args) {
 {
  t.Parameters(pars, args).first
 } -> std::convertible_to<const BaseParameters*>;
};

template<class T>
concept ParametersSupported = ParametersRequiredRegion<T> || ParametersNotRequiredRegion<T>;

template<class T>
concept ReadPSupported = requires(T t, const MString& vname, const BaseParameters* ip, size_t i) {
 {
  t.Read(vname, ip, i)(0)
 } -> std::convertible_to<real>;
};
template<class T>
concept ReadSupported = requires(T t, const MString& vname, size_t i) {
 {
  t.Read(vname, i)(0)
 } -> std::convertible_to<real>;
};

template<class T>
concept IsUVData = requires(T t) {
 {
  t.U(0)
 } -> std::convertible_to<real>;
 {
  t.V(0)
 } -> std::convertible_to<real>;
 {
  t.U2(0)
 } -> std::convertible_to<real>;
};

namespace internal
{
template<class T>
concept HaveXYStep = requires(T t) {
 {
  t.XStep()
 } -> std::convertible_to<real>;
 {
  t.YStep()
 } -> std::convertible_to<real>;
};

template<typename...> using void_ = void;

template<class D, bool RP, bool R> struct GetReadType_;

template<class D, bool R> struct GetReadType_<D, true, R>
{
 using p    = BaseParameters*;
 using type = decltype(D().Read(MString(), p(), 0));
};

template<class D> struct GetReadType_<D, false, true>
{
 using type = decltype(D().Read(MString(), 0));
};

template<class T>
concept HaveDisable = requires(T t) {
 {
  T::disabledactions
 } -> std::convertible_to<const char*>;
};

consteval bool cmpspace(const char* s1, const char* s2)
{
 size_t i = 0;
 while(true)
 {
  if(s1[i] != s2[i]) return false;
  i++;
  if(s1[i] == 0 && (s2[i] == 0 || s2[i] == ' ')) return true;
  if(s1[i] == 0 || s2[i] == 0 || s2[i] == ' ') return false;
 }
 return false;
}
} // namespace internal

template<class Act, class S> consteval bool IsDisabled()
{
 if constexpr(!internal::HaveDisable<S>)
  return false;
 else
 {
  bool   prsp = true;
  size_t i    = 0;
  do {
   if(prsp && internal::cmpspace(Act::name, S::disabledactions + i)) return true;
   prsp = S::disabledactions[i] == ' ';
  } while(S::disabledactions[++i] != 0);
  return false;
 }
}

template<class D> using ReadType = internal::GetReadType_<D, ReadPSupported<D>, ReadSupported<D>>::type;

template<class T>
concept ReadIsGrid = requires {
 {
  ReadType<T>().XStep()
 } -> std::convertible_to<real>;
 {
  ReadType<T>().YStep()
 } -> std::convertible_to<real>;
};

template<class T>
concept ReadIs2DGeoRectArray = requires {
 {
  ReadType<T>().Ix2Lon(0)
 } -> std::convertible_to<real>;
 {
  ReadType<T>().Iy2Lat(0)
 } -> std::convertible_to<real>;
};