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C dynamic memory allocation refers to performing manual memory management for dynamic memory allocation in the C programming language via a group of functions in the C standard library, namely malloc, realloc, calloc, aligned_alloc and free.
The C++ programming language includes these functions; however, the operators new and delete provide similar functionality and are recommended by that language's authors. Still, there are several situations in which using new
/delete
is not applicable, such as garbage collection code or performance-sensitive code, and a combination of malloc
and placement new
may be required instead of the higher-level new
operator.
Many different implementations of the actual memory allocation mechanism, used by malloc, are available. Their performance varies in both execution time and required memory.