QueryExpr Class Reference

Concrete class for AST Node representing a query. More...

#include <Ast.hpp>

Inheritance diagram for QueryExpr:

List of all members.

Public Member Functions
	QueryExpr (const QualifiedType &type, const Expr &expr)
	Default constructor.
const Expr &	getExpr () const
	Returns the query expression.
Private Member Functions
virtual void	visit (Expr::Visitor &visitor) const
	Abstract visitor function.
Private Attributes
const Expr &	_expr

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Detailed Description

Concrete class for AST Node representing a query.

A query is used to extract data from certain data structures such as trees and databases. For example:

        local y = { @name::(true) && @age::((val > 25) && (val < 35))};

Here, y is a query that returns the age value if between 25 and 35, and the name value unconditionally.

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Constructor & Destructor Documentation

QueryExpr	(	const QualifiedType &	type,
		const Expr &	expr
	)		[inline]

Default constructor.

Parameters:

type	Expression type
expr	The root node of the query expression, usually consisting of query expression parts.

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Member Function Documentation

const Expr& getExpr

(

)

const [inline]

Returns the query expression.

Returns:

The query expression

void visit

(

Expr::Visitor &

visitor

)

const [private, virtual]

Abstract visitor function.

Parameters:

visitor

The visitor object.

Implements Expr.

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Member Data Documentation

const Expr& _expr [private]

Returns:

The query expression

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The documentation for this class was generated from the following files:

• /home/renji/Data/projects/zenlang/sources/zbl/Ast.hpp
• /home/renji/Data/projects/zenlang/sources/zbl/Ast.cpp