nixt::RecursiveASTVisitor< Derived > Struct Template Reference

A CRTP base class for traversing nix::Expr * nodes. More...

#include <Visitor.h>

Public Member Functions
bool	shouldTraversePostOrder ()
bool	visitExpr (const nix::Expr *)
Derived &	getDerived ()
bool	traverseExpr (const nix::Expr *E)

Detailed Description

template<class Derived>
struct nixt::RecursiveASTVisitor< Derived >

A CRTP base class for traversing nix::Expr * nodes.

Usage:

struct MyVisitor : public RecursiveASTVisitor<MyVisitor> {
  // This can be omitted.
  bool traverseExpr(const nix::Expr *E) {
    // Do something before/after traversing children.
  }
 
  // return `true` to traverse post-order, otherwise pre-order (default).
  bool shouldTraversePostOrder() { return true; }
 
  // sreturn `true` if we should continue traversing.
  bool visitExprInt(const nix::ExprInt *E) { return true; }
  bool visitExprFloat(const nix::ExprFloat *E) { return true; }
} V;
V.traverseExpr(Root); // call traverseExpr() on Root.

Note

This is based on dynamic_cast, so it is not very efficient.

visit*() methods are called once for each node.traverse*() methods are automatically generated describing relations between nodes. Usually you should always write custom visit*() methods, and only write traverse*() methods when you need to do something special.

Definition at line 48 of file Visitor.h.

Member Function Documentation

getDerived()

template<class Derived >

Derived & nixt::RecursiveASTVisitor< Derived >::getDerived ( )

inline

Definition at line 63 of file Visitor.h.

shouldTraversePostOrder()

template<class Derived >

bool nixt::RecursiveASTVisitor< Derived >::shouldTraversePostOrder ( )

inline

Definition at line 50 of file Visitor.h.

traverseExpr()

template<class Derived >

bool nixt::RecursiveASTVisitor< Derived >::traverseExpr ( const nix::Expr * E )

inline

Definition at line 65 of file Visitor.h.

Referenced by nixt::parentMap().

visitExpr()

template<class Derived >

bool nixt::RecursiveASTVisitor< Derived >::visitExpr ( const nix::Expr * )

inline

Definition at line 52 of file Visitor.h.

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The documentation for this struct was generated from the following file:

• Visitor.h