xtnew(1) [hpux man page]

XtNew() 																   XtNew()

Name
  XtNew - allocate storage for one instance of a data type.

Synopsis
  type *XtNew(type)

Inputs
  type	    Specifies a  data type.  Note that this is not a variable.

Returns
  A pointer to sufficient allocated memory to store a variable of type type.

Description
  XtNew()  is  a  macro used to allocate storage for one instance of the data type type.  It is called with the datatype (a type, not a vari-
  able) and returns a pointer to enough allocated memory to hold that type.  The return value is correctly cast to type *.

  If there is insufficient memory, XtNew() calls XtErrorMsg() to display an error message and terminate the application.

Usage
  Memory allocated with XtNew() must be deallocated with XtFree().

  To allocate memory and copy an a string, use XtNewString().

Example
  XtNew() can be used as follows:

     typedef struct _node {
	 int value;
	 struct _node next;
     } Node;

     Node *n = XtNew(Node);

Background
  XtNew() is simply the following macro:

     #define XtNew(type) ((type *) XtMalloc((unsigned) sizeof(type)))

See Also
  XtMalloc(1), XtNewString(1).

Xt - Memory Allocation															   XtNew()

XtMalloc(3)							   XT FUNCTIONS 						       XtMalloc(3)

NAME

       XtMalloc, XtCalloc, XtRealloc, XtFree, XtNew, XtNewString - memory management functions

SYNTAX

       char *XtMalloc(Cardinal size);

       char *XtCalloc(Cardinal num, Cardinal size);

       char *XtRealloc(char *ptr, Cardinal num);

       void XtFree(char *ptr);

       type *XtNew(type);

       String XtNewString(String string);

ARGUMENTS

       num	 Specifies the number of bytes or array elements.

       ptr	 Specifies a pointer to the old storage or to the block of storage that is to be freed.

       size	 Specifies the size of an array element (in bytes) or the number of bytes desired.

       string	 Specifies a previously declared string.

       type	 Specifies a previously declared data type.

DESCRIPTION

       The XtMalloc functions returns a pointer to a block of storage of at least the specified size bytes.  If there is insufficient memory to
       allocate the new block, XtMalloc calls XtErrorMsg.

       The XtCalloc function allocates space for the specified number of array elements of the specified size and initializes the space to zero.
       If there is insufficient memory to allocate the new block, XtCalloc calls XtErrorMsg.

       The XtRealloc function changes the size of a block of storage (possibly moving it).  Then, it copies the old contents (or as much as will
       fit) into the new block and frees the old block.  If there is insufficient memory to allocate the new block, XtRealloc calls XtErrorMsg.
       If ptr is NULL, XtRealloc allocates the new storage without copying the old contents; that is, it simply calls XtMalloc.

       The XtFree function returns storage and allows it to be reused.	If ptr is NULL, XtFree returns immediately.

       XtNew returns a pointer to the allocated storage.  If there is insufficient memory to allocate the new block, XtNew calls XtErrorMsg.
       XtNew is a convenience macro that calls XtMalloc with the following arguments specified:

       ((type *) XtMalloc((unsigned) sizeof(type))

       XtNewString returns a pointer to the allocated storage.	If there is insufficient memory to allocate the new block, XtNewString calls XtEr-
       rorMsg.	XtNewString is a convenience macro that calls XtMalloc with the following arguments specified:

       (strcpy(XtMalloc((unsigned) strlen(str) + 1), str))

SEE ALSO

       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

X Version 11							    libXt 1.0.5 						       XtMalloc(3)