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/*******************************************************************************
* Copyright (c) 2004, 2011 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Doug Schaefer (IBM) - Initial API and implementation
* Markus Schorn (Wind River Systems)
*******************************************************************************/
package org.eclipse.cdt.core.dom.ast;
/**
* This is the root class of expressions.
*
* @noextend This interface is not intended to be extended by clients.
* @noimplement This interface is not intended to be implemented by clients.
*/
public interface IASTExpression extends IASTInitializerClause {
/**
* @since 5.3
*/
public enum ValueCategory {
/**
* Traditional lvalue
*/
LVALUE,
/**
* Expiring value as introduced by c++11.
*/
XVALUE,
/**
* Pure rvalue.
*/
PRVALUE;
/**
* Both prvalues and xvalues are rvalues.
*/
public boolean isRValue() {
return this != LVALUE;
}
/**
* A generalized lvalue is either an lvalue or an xvalue.
*/
public boolean isGLValue() {
return this != PRVALUE;
}
}
/**
* Empty expression array.
*/
public static final IASTExpression[] EMPTY_EXPRESSION_ARRAY = {};
/**
* Returns the type of the value the expression evaluates to.
*/
public IType getExpressionType();
/**
* Returns whether this expression is an lvalue. LValues are for instance required on
* the left hand side of an assignment expression.
* @since 5.2
*/
public boolean isLValue();
/**
* Returns the value category of this expression.
* @since 5.3
*/
ValueCategory getValueCategory();
/**
* @since 5.1
*/
@Override
public IASTExpression copy();
/**
* @since 5.3
*/
@Override
public IASTExpression copy(CopyStyle style);
}
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