expression_operand.hpp

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#pragma once
#include <concepts>
#include <type_traits>

namespace xtd {
  namespace expressions {
    struct expression;
    
    //template<typename left_t, typename right_t>
    //concept expression_operand =
    //expression<left_t> || expression<right_t>;
    template<typename type_t>
    concept expression_operand = std::is_base_of_v<xtd::expressions::expression, std::decay_t<type_t>>;
  }
}