Numeric types
Integer types
The unsigned integer types consist of:
Type | Minimum | Maximum |
---|---|---|
u8 | 0 | 28-1 |
u16 | 0 | 216-1 |
u32 | 0 | 232-1 |
u64 | 0 | 264-1 |
u128 | 0 | 2128-1 |
The signed two's complement integer types consist of:
Type | Minimum | Maximum |
---|---|---|
i8 | -(27) | 27-1 |
i16 | -(215) | 215-1 |
i32 | -(231) | 231-1 |
i64 | -(263) | 263-1 |
i128 | -(2127) | 2127-1 |
Floating-point types
The IEEE 754-2008 "binary32" and "binary64" floating-point types are f32
and
f64
, respectively.
Machine-dependent integer types
The usize
type is an unsigned integer type with the same number of bits as the
platform's pointer type. It can represent every memory address in the process.
The isize
type is a signed integer type with the same number of bits as the
platform's pointer type. The theoretical upper bound on object and array size
is the maximum isize
value. This ensures that isize
can be used to calculate
differences between pointers into an object or array and can address every byte
within an object along with one byte past the end.
usize
and isize
are at least 16-bits wide.
Note: Many pieces of Rust code may assume that pointers,
usize
, andisize
are either 32-bit or 64-bit. As a consequence, 16-bit pointer support is limited and may require explicit care and acknowledgment from a library to support.