Struct show_notes::e029::Point

#[repr(C)]
pub struct Point {
    pub x: c_float,
    pub y: c_float,
}

An example of a slightly more complex data structure we can use with FFI.

Note the #[repr(C)], which tells Rust to make sure this struct is laid out the way that the C ABI expects. That’s not the way that Rust’s own ABI (which is unstable and can change at any time) might lay it out.

Note also that x and y are c_float, which is a type alias for f32. We use it here to make explicit the interop, and also because it is possible that it might change on some specific operating system. If we went to compile for an operating system where C’s float type were not a 32-point floating bit number (and the C standard does not require it to be anything but “a floating point number”), the compiler would let us know.

Fields

x: c_float

y: c_float

Trait Implementations

impl Debug for Point

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq<Point> for Point

fn eq(&self, other: &Point) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Point