Struct libffi::middle::Type

pub struct Type(_);

Represents a single C type.

Example

Suppose we have a C struct:

struct my_struct {
    uint16_t f1;
    uint64_t f2;
};

To pass the struct by value via libffi, we need to construct a Type object describing its layout:

use libffi::middle::Type;

let my_struct = Type::structure(vec![
    Type::u64(),
    Type::u16(),
]);

Methods

impl Type

pub fn void() -> Self

Returns the representation of the C void type.

This is used only for the return type of a CIF, not for an argument or struct member.

pub fn u8() -> Self

Returns the unsigned 8-bit numeric type.

pub fn i8() -> Self

Returns the signed 8-bit numeric type.

pub fn u16() -> Self

Returns the unsigned 16-bit numeric type.

pub fn i16() -> Self

Returns the signed 16-bit numeric type.

pub fn u32() -> Self

Returns the unsigned 32-bit numeric type.

pub fn i32() -> Self

Returns the signed 32-bit numeric type.

pub fn u64() -> Self

Returns the unsigned 64-bit numeric type.

pub fn i64() -> Self

Returns the signed 64-bit numeric type.

pub fn usize() -> Self

Returns the C equivalent of Rust usize (u64).

pub fn isize() -> Self

Returns the C equivalent of Rust isize (i64).

pub fn c_schar() -> Self

Returns the C signed char type.

pub fn c_uchar() -> Self

Returns the C unsigned char type.

pub fn c_short() -> Self

Returns the C short type.

pub fn c_ushort() -> Self

Returns the C unsigned short type.

pub fn c_int() -> Self

Returns the C int type.

pub fn c_uint() -> Self

Returns the C unsigned int type.

pub fn c_long() -> Self

Returns the C long type.

pub fn c_ulong() -> Self

Returns the C unsigned long type.

pub fn c_longlong() -> Self

Returns the C longlong type.

pub fn c_ulonglong() -> Self

Returns the C unsigned longlong type.

pub fn f32() -> Self

Returns the C float (32-bit floating point) type.

pub fn f64() -> Self

Returns the C double (64-bit floating point) type.

pub fn pointer() -> Self

Returns the C void* type, for passing any kind of pointer.

pub fn longdouble() -> Self

Returns the C long double (extended-precision floating point) type.

pub fn structure<I>(fields: I) -> Self where
    I: IntoIterator<Item = Type>,
    I::IntoIter: ExactSizeIterator<Item = Type>, 

Constructs a structure type whose fields have the given types.

pub fn as_raw_ptr(&self) -> *mut ffi_type

Gets a raw pointer to the underlying ffi_type.

This method may be useful for interacting with the low and raw layers.

Trait Implementations

impl Debug for Type

fn fmt(&self, formatter: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Drop for Type

fn drop(&mut self)

Executes the destructor for this type.

impl Clone for Type

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.