set-new-mode.md

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_set_new_mode | Microsoft Docs		11/04/2016			cpp-standard-libraries		article	_set_new_mode	msvcrt.dll msvcr80.dll msvcr90.dll msvcr100.dll msvcr100_clr0400.dll msvcr110.dll msvcr110_clr0400.dll msvcr120.dll msvcr120_clr0400.dll ucrtbase.dll api-ms-win-crt-heap-l1-1-0.dll	DLLExport	set_new_mode _set_new_mode	C++	handler modes _set_new_mode function set_new_mode function	4d14039a-e54e-4689-8c70-74a4b9834768	14	corob-msft	corob	ghogen

_set_new_mode

Sets a new handler mode for malloc.

Syntax

int _set_new_mode(  
   int newhandlermode   
);  

Parameters

newhandlermode
New handler mode for malloc; valid value is 0 or 1.

Return Value

Returns the previous handler mode set for malloc. A return value of 1 indicates that, on failure to allocate memory, malloc previously called the new handler routine; a return value of 0 indicates that it did not. If the newhandlermode argument does not equal 0 or 1, returns -1.

Remarks

The C++ _set_new_mode function sets the new handler mode for malloc. The new handler mode indicates whether, on failure, malloc is to call the new handler routine as set by _set_new_handler. By default, malloc does not call the new handler routine on failure to allocate memory. You can override this default behavior so that, when malloc fails to allocate memory, malloc calls the new handler routine in the same way that the new operator does when it fails for the same reason. For more information, see the new and delete operators in the C++ Language Reference. To override the default, call:

_set_new_mode(1)  

early in your program or link with Newmode.obj (see Link Options).

This function validates its parameter. If newhandlermode is anything other than 0 or 1, the function invokes the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, _set_new_mode returns -1 and sets errno to EINVAL.

Requirements

Routine	Required header
_set_new_mode	<new.h>

For more compatibility information, see Compatibility in the Introduction.

See Also

Memory Allocation
calloc
free
realloc
_query_new_handler
_query_new_mode