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Primitive Types

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Primitive Integral Types

Specified Width Integral Types

An integer type can be specified to be signed or unsigned and can be any bitwidth from 1 all the way up to 8388608 (2²³). The type is written with an I for signed and UI for unsigned, followed by the bitwidth.

Type	Description
`I32`	32-bit signed integer
`UI64`	64-bit unsigned integer
`I1`	1-bit signed integer
`UI46824`	46,824-bit unsigned integer

Target-Dependent Integral Types

Type	Description
`Int`	Signed integer that has the same width of a general register on the target (64 on x86_64)
`UInt`	Unsigned integer that has the same width of a general register on the target (64 on x86_64)
`ISize`	Signed integer that has the same width of a pointer on the target (64 on x86_64)
`USize`	Unsigned integer that has the same width of a pointer on the target (64 on x86_64)

Integral Types for C/C++ Compatibility

Type	C/C++ equivalent
`CShort`	`short`
`CUShort`	`unsigned short`
`CInt`	`int`
`CUInt`	`unsigned int`
`CLong`	`long`
`CULong`	`unsigned long`
`CLongLong`	`long long`
`CULongLong`	`unsigned long long`

Primitive Floating Point Types

Type	Description
`F16`	16-bit floating point (IEEE-754 binary16)
`BF16`	16-bit floating point (bfloat16)
`F32`	32-bit floating point (IEEE-754 binary32)
`F64`	64-bit floating point (IEEE-754 binary64)
`F80`	80-bit floating point (x87)
`F128`	128-bit floating point (IEEE-754 binary128)
`CLongDouble`	C/C++ compatibility type for `long double`

Miscellaneous Primitive Types

Type	Description
`Void`	Nothing (for example, to signify that a `function` returns nothing)
`Byte`	A single byte
`Bool`	Boolean type (`true` or `false`)
`Char`	ASCII Character
`RawPtr`	Opaque pointer type (like `void*` in C/C++)
`TypeID`	Type that represents the unique ID of a type (value not guaranteed to be consistent between compiles)