Pointer-sized integer
A pointer-sized integer is a signed or unsigned integer type whose width matches the target platform’s pointer size.
Learn Rust in a Month of Lunches
A pointer-sized integer is a Rust signed or unsigned integer whose width matches the computer architecture.
- How it is used
- Uses `usize` for array indexing and const-generic array lengths; lists `isize` among signed integer types.
- How deep it goes
- Defines the types within an integer survey and demonstrates `usize` in a struct; does not calculate architecture-specific widths.
- Examples
- Shows a struct with `const N: usize` and two arrays, then creates instances with lengths three and four.
- What you can do after
- Apply it via Rust's `usize` to declare a const-generic array length.
Read how Learn Rust in a Month of Lunches explains pointer-sized integer →
Rust in Action: Systems programming concepts and techniques
isize is Rust's signed integer type whose width matches the target platform's pointer size.
- How it is used
- Uses isize to name a signed, pointer-width integer while explaining memory addresses, address spaces, and virtual memory.
- How deep it goes
- Defines pointer-sized width and links it to CPU registers, but stops short of detailed isize operations or code examples.
- Examples
- Compares isize with word-sized memory units, pointer widths, CPU registers, and pointer diagrams.
- What you can do after
- Evaluate how a Rust integer’s width relates to pointers, memory addresses, and the target machine.
Related concepts
- indexinguses · Indexing is the organization or use of positions, keys, or lookup structures to identify and retrieve selected data or elements.
- const genericsused by · Const generics are generic parameters whose values are compile-time constants rather than types or runtime values.
- slicingpart of · Slicing selects or partitions a portion of an indexed sequence or multidimensional array, often along specified indices or dimensions.
- function parameterused by · A function parameter is a named input declared in a function definition that receives a corresponding argument value when the function is called.
- function pointer typeused by · A function pointer is a value that designates a callable function and can be stored, passed, or invoked indirectly.
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