171 lines
4.1 KiB
Groff
171 lines
4.1 KiB
Groff
.\" Copyright (c) 1993, 1994 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included in
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.\" all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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.\" SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall not
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.\" be used in advertising or otherwise to promote the sale, use or other
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.\" dealing in this Software without prior written authorization from the
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.\" X Consortium.
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.\"
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.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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.de De
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.ce 0
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.if \\n(BD .DF
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.nr BD 0
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.in \\n(OIu
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.if \\n(TM .ls 2
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.sp \\n(DDu
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.fi
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..
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.de FD
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.LP
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.KS
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.TA .5i 3i
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.ta .5i 3i
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.nf
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..
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.de FN
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.fi
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.KE
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.LP
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..
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.de IN \" send an index entry to the stderr
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..
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.de C{
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.KS
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.nf
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.D
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.\"
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.\" choose appropriate monospace font
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.\" heavy for your eyes...
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.\"
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.ie "\\*(.T"480" .ft L
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.el .ie "\\*(.T"300" .ft L
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.el .ie "\\*(.T"202" .ft PO
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.el .ie "\\*(.T"aps" .ft CW
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..
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.de C}
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.DE
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.R
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..
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.de Pn
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.ie t \\$1\fB\^\\$2\^\fR\\$3
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.el \\$1\fI\^\\$2\^\fP\\$3
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..
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.de ZN
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.ie t \fB\^\\$1\^\fR\\$2
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.el \fI\^\\$1\^\fP\\$2
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.de NT
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.ne 7
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.ds NO Note
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.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
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.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
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.ie n .sp
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.el .sp 10p
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.TB
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.ce
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. \" Note End -- doug kraft 3/85
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.de NE
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..
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.ny0
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.TH XtOffset __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtOffset, XtOffsetOf, XtNumber \- determine the byte offset or number of array elements
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.SH SYNTAX
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.HP
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Cardinal XtOffset(Type \fIpointer_type\fP, Field \fIfield_name\fP);
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.HP
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Cardinal XtOffsetOf(Type \fIstructure_type\fP, Field \fIfield_name\fP);
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.HP
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Cardinal XtNumber(ArrayVariable \fIarray\fP);
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.SH ARGUMENTS
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.IP \fIarray\fP 1i
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Specifies a fixed-size array.
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.IP \fIfield_name\fP 1i
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Specifies the name of the field for which to calculate the byte offset.
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.IP \fIpointer_type\fP 1i
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Specifies a type that is declared as a pointer to the structure.
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.IP \fIstructure_type\fP 1i
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Specifies a type that is declared as a structure.
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.SH DESCRIPTION
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The
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.ZN XtOffset
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macro is usually used to determine the offset of various resource fields
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from the beginning of a widget and can be used at compile time in static
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initializations.
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.LP
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The
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.ZN XtOffsetOf
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macro expands to a constant expression that gives the offset in bytes
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to the specified structure member from the beginning of the structure.
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It is normally used to statically initialize resource lists and is more
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portable than
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.ZN XtOffset ,
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which serves the same function.
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.LP
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The
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.ZN XtNumber
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macro returns the number of elements in the specified argument lists,
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resources lists, and other counted arrays.
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.SH "SEE ALSO"
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XtGetResourceList(__libmansuffix__),
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XtSetArg(__libmansuffix__)
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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