How Does `delete[]` Accurately Deallocate Memory Allocated with `new[]`?

Understanding Memory Deallocation with delete[]

When allocating memory on the heap using new, the allocated memory size is stored in a "head" segment preceding the actual memory. This head segment allows the deallocator to accurately determine the size of the allocated memory, ensuring precise deallocation.

Applying this concept to the code segment you provided:

Foo* set = new Foo[100];
// ...
delete [] set;

The array set is allocated 100 instances of Foo on the heap, and the allocated memory size is stored in the head segment. When delete [] set is called, the deallocator accesses the head segment, retrieves the stored size (in this case, 100 elements), and proceeds to deallocate that amount of memory, effectively releasing the allocated space.

This mechanism is standardized in C , providing a reliable way to deallocate arrays allocated using new. The allocation and deallocation operations work in tandem to efficiently manage memory while ensuring data integrity and stability.

The above is the detailed content of How Does `delete[]` Accurately Deallocate Memory Allocated with `new[]`?. For more information, please follow other related articles on the PHP Chinese website!