constant.hpp

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

namespace xtd {
  namespace expressions {
    template <auto constant_value>
    struct constant : value_expression {
      
      static constexpr operator_precedence precedence = operator_precedence::constant;
      
      
      constexpr constant() = default;
      
      
      
      constexpr auto operator()(auto&&...) const {
        return value_;
      }

      
      friend auto operator <<(std::ostream& os, constant c) -> std::ostream& {return os << c.value_;}
      
    private:
      static constexpr auto value_ = constant_value;
    };
    
    template <auto constant_value>
    constexpr auto expression::constant() {return xtd::expressions::constant<constant_value> {};}
  }
}