#include <exceptions.hh>

Inheritance diagram for EI< Tag, Type >:

Collaboration diagram for EI< Tag, Type >:

Public Types
typedef boost::error_info< Tag, Type >	ErrorInfo

Public Member Functions
	EI (Type const &value)
	Construction from given value, that has to bee passed to the catch point. More...

Static Public Member Functions
static internal::ExcStream &	val (internal::ExcStream &es)

static internal::ExcStream &	qval (internal::ExcStream &es)

static Type const &	ref (ExceptionBase const &e)

static Type const *	ptr (ExceptionBase const &e)

Detailed Description

template<class Tag, class Type>
class EI< Tag, Type >

This class should not be used directly but through macro TYPEDEF_ERR_INFO. It is derived from boost::error_info<tag, type> and similarly as its parent it is tailored for passing a value of type Type from the throw point to the catch point. Compared to boost::error_info it provides manipulators val and qval which can by used in formating exception message to the ExcStream. The first manipulator evaluates directly to the output of the stored value, while qval puts the output into single quotas.

The static function ref can be used when you want to extract and output some particular information from the passed value. However, if no value is given at throw point this function simply aborts. There is probably no way how to make the check and still keep flexibility in manipulation with the result of ref function.

For usage see documentation of TYPEDEF_ERR_INFO mecro.

Definition at line 189 of file exceptions.hh.