unique_ptr is NOT just for heap allocations | custom deleters

Define your own deleter.

The smart pointer type unique_ptr is NOT just for automating deletes of heap-allocated pointers. By specifying a custom deleter type, you can use them to clean up any resource that doesn't clean up after itself. Yes, you can delete a new, but you can also free a malloc, fclose an fopen, or deallocate an allocate for a custom allocator type (feel free to use a stack allocator!). This can be useful for interoperating with C code or code from other languages, as well as to clean up after classes or incidental data structures that don't otherwise clean up after themselves.

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unique_ptr intro video:    • unique_ptr: C++'s simplest smart pointer  

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