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Обсуждение на тему: Rust stack

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Rust stack

In this series i show the simplest way to build some data structures in rust. I only guarantee that they work as they are intended to work theoretically. What is a stack? Well start with a very commonly used data structure called stack. Even you if you have never heard about stacks, you probably are already indirectly familiar with them arraysvectors are a more powerful version of stacks. A stack is a data structure with lifo features for the last in, first out. In the case of the fifth picture, if you want to get 2, you must first remove 3, 4, and 5 from the stack.

A stack is a data structure with lifo features for the last in, first out. In the case of the fifth picture, if you want to get 2, you must first remove 3, 4, and 5 from the stack. If youre looking to maximize your efficiency, i recommend checking out unterstanding rusts vec and its capacity for fast and efficient programs. It goes into a lot more detail about how allocation and reallocation occurs in vec and vecdeque, but the biggest take away is that if you can predict the maximum number of elements youre going to need in the queue you can use vecdequewithcapacity(x) if you know when you initialize it, or. 2,147,483,647 is the max for stack sizes for all stack size plugins as it is a hardcoded limitation of rust. Setting individual stack sizes is done in the configuration not datafile in value individualitemstacksize which is generated on plugin load.

Stack and heap are parts of memory available to our rust code to use at runtime. To ensure that rust is memory-safe, it introduces concepts like ownership, references and borrowing. To understand these concepts, we must first understand how to allocate and deallocate memory into the stack and heap. But you cant just use the stack all the time, because rust needs to know the size of a variable at compile time. So simple variables like i32 go on the stack, because we know their exact size. You always know that an i32 is going to be 4 bytes, because 32 bits 4 bytes.

So what do you do? First you put the data in the heap, because the heap can have any size of data. При размещении данных в куче распределитель памяти (memory allocator) находит в куче кусок памяти достаточного размера, чтобы вместить данные, и возвращает указатель - адрес этого куска в памяти, куда помещены данные. Чтобы получить объект типа string, у строкового литерала hello вызывается метод tostring(). В данном случае стек и кучу мы можем представить визуально следующим образом куча heap in rust. .