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Allocators | zig.guide

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The Zig standard library provides a pattern for allocating memory, which allows the programmer to choose precisely how memory allocations are done within the standard library - no allocations happen behind your back in the standard library. The most basic allocator is std.heap.page_allocator. Whenever this allocator makes an allocation, it will ask your OS for entire pages of memory; an allocation of a single byte will likely reserve multiple kibibytes. As asking the OS for memory requires a system call, this is also extremely inefficient for speed. Here, we allocate 100 bytes as a []u8. Notice how defer is used in conjunction with a free - this is a common pattern for memory management in Zig. The std.heap.FixedBufferAllocator is an allocator that allocates memory into a fixed buffer and does not make any heap allocations. This is useful when heap usage is not wanted, for example, when writing a kernel. It may also be considered for performance reasons. It will give you the error OutO

Version: Zig 0.15.2 The Zig standard library provides a pattern for allocating memory, which allows the programmer to choose precisely how memory allocations are done within the standard library - no allocations happen behind your back in the standard library. The most fundamental allocator is std.heap.page_allocator . Whenever this allocator makes an allocation, it will ask your OS for entire pages of memory; an allocation of a single byte will likely reserve multiple kibibytes. As asking the OS for memory requires a system call, this is also extremely inefficient for speed. Here, we allocate

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