expression_stream.hpp

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#pragma once
#include "operator_precedence.hpp"
#include <ostream>

namespace xtd {
  namespace expressions {
    template <typename expression_t>
    struct expression_stream {
      const expression_t& expression;
      operator_precedence parent_precedence;
    };

    template <typename expression_t>
    auto operator<<(std::ostream& os, const expression_stream<expression_t>& ps) -> std::ostream& {
      if (ps.parent_precedence < expression_t::precedence) os << "(" << ps.expression << ")";
      else os << ps.expression;
      return os;
    }
  }
}