std::memmodule in Rust provides tools for fine-grained control over memory allocation and deallocation. The module includes types such as
MaybeUninit<T>for uninitialized memory,
ManuallyDrop<T>for manual control over value drop order, and
Unique<T>for exclusive ownership of a pointee. These tools can be useful for implementing custom data structures, working with foreign function interfaces (FFI), and working with raw pointers.
std::mem module in Rust provides a number of useful types and functions that allow for fine-grained control over memory allocation and deallocation.
One of the most notable types in this module is
MaybeUninit<T>, which allows for uninitialized memory to be used as if it were initialized. This can be useful when creating custom data structures, such as a custom allocation scheme for a container, or when working with FFI, where memory may need to be allocated before it can be initialized.
Another important type in the
std::mem module is
ManuallyDrop<T>, which allows for manual control over the drop order of a value. This can be useful when working with FFI, where it may be necessary to manually drop a value before calling a foreign function that frees memory.
Unique<T> is a smart pointer type that guarantees that it's the only owner of the pointee. In other words, it can't be copied, and the pointee is deallocated when it goes out of scope. It's useful when working with raw pointers, and when you need to ensure that the memory is cleaned up automatically when it's no longer needed.
Overall, the types in the
std::mem module provide powerful tools for working with memory in Rust, and can be especially useful when working with low-level functionality, such as FFI, or when implementing custom data structures.