Forward furc ast

Signed-off-by: CHatingPython <chatingpython@gmail.com>

furc/include/furc/ast/fwd.hpp

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+#ifndef FURC_AST_FWD_HPP
+#define FURC_AST_FWD_HPP
+
+#include "furc/handle.hpp"
+
+#include <string>
+
+namespace furc {
+namespace ast {
+
+class node;
+
+template <typename T, typename Error = std::string>
+using node_handle = handle<T*, Error>;
+
+class literal_node;
+using literal_node_h = node_handle<literal_node>;
+class expression_node;
+using expression_node_h = node_handle<expression_node>;
+class declaration_node;
+using declaration_node_h = node_handle<declaration_node>;
+class statement_node;
+using statement_node_h = node_handle<statement_node>;
+class program_node;
+using program_node_h = node_handle<program_node>;
+
+class string_literal_node;
+using string_literal_node_h = node_handle<string_literal_node>;
+class integer_literal_node;
+using integer_literal_node_h = node_handle<integer_literal_node>;
+
+class var_read_expression_node;
+using var_read_expression_node_h = node_handle<var_read_expression_node>;
+class unaryop_expression_node;
+using unaryop_expression_node_h = node_handle<unaryop_expression_node>;
+class binop_expression_node;
+using binop_expression_node_h = node_handle<binop_expression_node>;
+class var_assign_expression_node;
+using var_assign_expression_node_h = node_handle<var_assign_expression_node>;
+
+class function_declaration_node;
+using function_declaration_node_h = node_handle<function_declaration_node>;
+class function_definition_node;
+using function_definition_node_h = node_handle<function_definition_node>;
+
+class return_statement_node;
+using return_statement_node_h = node_handle<return_statement_node>;
+
+} // namespace ast
+} // namespace furc
+
+#endif // FURC_AST_FWD_HPP