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- Stored in Computer RAM like the heap.
- Variables created on the stack will go out of scope and automatically deallocate.
- Much faster to allocate in comparison to variables on the heap. • Implemented with an actual stack data structure.
- Stores local data, return addresses, used for parameter passing
- Can have a stack overflow when too much of the stack is used. (mostly from infinite (or too much) recursion, very large allocations)
- Data created on the stack can be used without pointers.
- You would use the stack if you know exactly how much data you need to allocate before compile time and it is not too big.
- Usually has a maximum size already determined when your program starts.
- Stored in computer RAM like the stack.
- Variables on the heap must be destroyed manually and never fall out of scope. The data is freed with delete, delete[ ] or free
- Slower to allocate in comparison to variables on the stack.
- Used on demand to allocate a block of data for use by the program.
- Can have fragmentation when there are a lot of allocations and deallocations
- In C++ data created on the heap will be pointed to by pointers and allocated with new or malloc
- Can have allocation failures if too big of a buffer is requested to be allocated.
- You would use the heap if you don’t know exactly how much data you will need at runtime or if you need to allocate a lot of data.
- Responsible for memory leaks.