OFerror_category Class Reference

OFerror_category serves as the base class for specific error category types, such as OFsystem_category. More...

Public Member Functions
	OFerror_category ()
	Default constructor, used by derived classes.
virtual	~OFerror_category ()
	Virtual destructor, does nothing.
virtual const char *	name () const =0
	Obtains the name of the category, for example "generic". More...
virtual OFString	message (int code) const =0
	Constructs an explanatory string for an error code. More...

Detailed Description

OFerror_category serves as the base class for specific error category types, such as OFsystem_category.

It is possible to make your own error_category class. The objects of error category classes are treated as singletons, passed by reference.

Note

this implementation is meant to be a subset of the C++11's std::error_category that lacks the following features: error condition support, iostream category, future category. See: http://en.cppreference.com/w/cpp/error/error_category to compare OFerror_category against std::error_category.

The following table describes the possible operations on two instances a and b of OFerror_category:

Expression	Meaning
a != b	Compares two OFerror_category objects and evaluates to OFTrue if both objects refer to different error categories.
a == b	Compares two OFerror_category objects and evaluates to OFTrue if both objects refer to the same error category.
a < b	Implements a total order on OFerror_category objects. The semantics of one category being compared less than another are intentionally not defined, but, if one category compares less than to another it will stay that way during the remaining execution of the program and one and the same category will never compare less than to itself.

See also

OFgeneric_category()

OFsystem_category()

Member Function Documentation

message()

virtual OFString OFerror_category::message ( int  code ) const

pure virtual

Constructs an explanatory string for an error code.

Parameters

code	an integer that shall be interpreted as an error code.

Returns

an explanatory error message for the given code as an OFString.

name()

virtual const char* OFerror_category::name ( ) const

pure virtual

Obtains the name of the category, for example "generic".

Returns

a character pointer that refers to the name of the category.

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

• ofstd/include/dcmtk/ofstd/oferror.h