| // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 
 | // Use of this source code is governed by a BSD-style license that can be | 
 | // found in the LICENSE file. | 
 |  | 
 | #ifndef TOOLS_GN_OPERATORS_H_ | 
 | #define TOOLS_GN_OPERATORS_H_ | 
 |  | 
 | class BinaryOpNode; | 
 | class Err; | 
 | class ParseNode; | 
 | class Scope; | 
 | class UnaryOpNode; | 
 | class Value; | 
 |  | 
 | Value ExecuteUnaryOperator(Scope* scope, | 
 |                            const UnaryOpNode* op_node, | 
 |                            const Value& value, | 
 |                            Err* err); | 
 | Value ExecuteBinaryOperator(Scope* scope, | 
 |                             const BinaryOpNode* op_node, | 
 |                             const ParseNode* left, | 
 |                             const ParseNode* right, | 
 |                             Err* err); | 
 |  | 
 | #endif  // TOOLS_GN_OPERATORS_H_ |