eval_context.hpp

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//          Copyright RedPortal, mujjingun 2017 - 2018.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

#ifndef EVAL_CONTEXT_HPP
#define EVAL_CONTEXT_HPP

#include <memory>
#include <mgcpp/expressions/expression.hpp>
#include <mgcpp/expressions/forward.hpp>
#include <mgcpp/expressions/placeholder.hpp>
#include <mgcpp/global/type_erased.hpp>
#include <type_traits>
#include <unordered_map>

namespace mgcpp {

struct eval_context {
  template <size_t Num, typename ResultType>
  void feed(placeholder_node<Num, ResultType> ph, ResultType const& val);

  template <size_t PlaceholderID, typename ResultType>
  ResultType get_placeholder() const;

 protected:
  std::unordered_map<int, static_any> _placeholders;
};

}  // namespace mgcpp

#include <mgcpp/expressions/eval_context.tpp>
#endif  // EVAL_CONTEXT_HPP