.TH ReqErr 3I "15 June 1987" "InterViews" "InterViews Reference Manual"
.SH NAME
ReqErr \- handle request errors
.SH SYNOPSIS
.B #include <InterViews/reqerr.h>
.SH DESCRIPTION
Some requests to the window server may generate an error.
For example, if a window is destroyed while it is being repositioned
interactively,
the request to place the window in the new position will fail.
Normally, errors cause a process to terminate.
The ReqErr class is used to handle errors within an application.
The base class defines the attributes associated with each error,
including a \fImessage\fP string describing the error,
an integer \fIrequest\fP code that specifies the kind of call that
generated the error, and a \fIid\fP object that was the target
of the request.
When an error occurs, the attributes of the current request handler
are assigned and the handler's Error operation is called.
.SH PUBLIC OPERATIONS
.TP
.B "ReqErr* Install()"
Use this error handler for subsequent errors and return
the previous error handler.
.TP
.B "virtual void Error()"
Handle a detected error.
The default handler is a nop.
.SH SEE ALSO
Interactor(3I)