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malloc.h

The following functions, macros, and classes are provided in malloc.h:

Name 
Description 
Header File
malloc.h
Category
Memory Routines
Prototype
void *alloca(size_t size);
Description
Allocates temporary stack space.
alloca allocates size bytes on the stack; the allocated space is automatically freed up when the calling function exits.
The use of alloca is not encouraged. In the try-block of a C++ program the alloca function should never be used. If an exception is thrown, any values placed on the stack by alloca will be corrupted.
Return Value
If enough stack space is available, alloca returns a pointer to the allocated stack area. Otherwise, it returns NULL.
Example  
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