3.3 KiB
[c.malloc]
20 Memory management library [mem]
20.2 Memory [memory]
20.2.12 C library memory allocation [c.malloc]
[Note 1:
The header declares the functions described in this subclause.
â end note]
void* aligned_alloc(size_t alignment, size_t size); void* calloc(size_t nmemb, size_t size); void* malloc(size_t size);
Effects: These functions have the semantics specified in the C standard library.
Remarks: These functions do not attempt to allocate storage by calling ::operator new() ([new.delete]).
These functions implicitly create objects ([intro.object]) in the returned region of storage and return a pointer to a suitable created object.
In the case of calloc, the objects are created before the storage is zeroed.
void* realloc(void* ptr, size_t size);
Preconditions: free(ptr) has well-defined behavior.
Effects: If ptr is not null and size is zero, the behavior is erroneous and the effects are implementation-defined.
Otherwise, this function has the semantics specified in the C standard library.
Remarks: This function does not attempt to allocate storage by calling ::operator new() ([new.delete]).
When a non-null pointer is returned, this function implicitly creates objects ([intro.object]) in the returned region of storage and returns a pointer to a suitable created object.
The objects are created before the storage is copied.
void free(void* ptr);
Effects: This function has the semantics specified in the C standard library.
Remarks: This function does not attempt to deallocate storage by calling::operator delete().
See also: ISO/IEC 9899:2024, 7.22.3