#include <value.hh>

Public Member Functions
virtual std::string	showType () const =0
virtual std::string	typeOf () const =0
virtual std::string	coerceToString (EvalState &state, const PosIdx &pos, NixStringContext &context, bool copyMore, bool copyToStore) const
virtual bool	operator== (const ExternalValueBase &b) const
virtual JSON	printValueAsJSON (EvalState &state, bool strict, NixStringContext &context, bool copyToStore=true) const
virtual void	printValueAsXML (EvalState &state, bool strict, bool location, XMLWriter &doc, NixStringContext &context, PathSet &drvsSeen, const PosIdx pos) const

Protected Member Functions
virtual std::ostream &	print (std::ostream &str) const =0

Friends
class	Printer
std::ostream &	operator<< (std::ostream &str, const ExternalValueBase &v)

Detailed Description

External values must descend from ExternalValueBase, so that type-agnostic nix functions (e.g. showType) can be implemented

Member Function Documentation

std::string nix::ExternalValueBase::coerceToString	(	EvalState &	state,
		const PosIdx &	pos,
		NixStringContext &	context,
		bool	copyMore,
		bool	copyToStore ) const

virtual

Coerce the value to a string. Defaults to uncoercable, i.e. throws an error.

bool nix::ExternalValueBase::operator== ( const ExternalValueBase & b ) const

virtual

Compare to another value of the same type. Defaults to uncomparable, i.e. always false.

virtual std::ostream & nix::ExternalValueBase::print ( std::ostream & str ) const

protectedpure virtual

Print out the value

JSON nix::ExternalValueBase::printValueAsJSON	(	EvalState &	state,
		bool	strict,
		NixStringContext &	context,
		bool	copyToStore = true ) const

virtual

Print the value as JSON. Defaults to unconvertable, i.e. throws an error

void nix::ExternalValueBase::printValueAsXML	(	EvalState &	state,
		bool	strict,
		bool	location,
		XMLWriter &	doc,
		NixStringContext &	context,
		PathSet &	drvsSeen,
		const PosIdx	pos ) const

virtual

Print the value as XML. Defaults to unevaluated

virtual std::string nix::ExternalValueBase::showType ( ) const

pure virtual

Return a simple string describing the type

virtual std::string nix::ExternalValueBase::typeOf ( ) const

pure virtual

Return a string to be used in builtins.typeOf

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