sprout/weed.hpp 追加

sprout/weed/expr/expr.hpp

@@ -0,0 +1,32 @@
+#ifndef SPROUT_WEED_EXPR_EXPR_HPP
+#define SPROUT_WEED_EXPR_EXPR_HPP
+
+#include <sprout/config.hpp>
+#include <sprout/tuple/tuple.hpp>
+#include <sprout/utility/forward.hpp>
+
+namespace sprout {
+	namespace weed {
+		//
+		// expr
+		//
+		template<typename Tag, typename... Args>
+		class expr {
+		public:
+			typedef Tag expr_tag;
+			typedef sprout::tuples::tuple<Args...> args_type;
+		private:
+			args_type args_;
+		public:
+			template<typename... As>
+			SPROUT_CONSTEXPR explicit expr(As&&... args)
+				: args_(sprout::forward<As>(args)...)
+			{}
+			SPROUT_CONSTEXPR args_type const& args() const {
+				return args_;
+			}
+		};
+	}	// namespace weed
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_WEED_EXPR_EXPR_HPP