Trait scroll::ctx::TryIntoCtx[−][src]

pub trait TryIntoCtx<Ctx: Copy = (), This: ?Sized = [u8]>: Sized {
    type Error;
    fn try_into_ctx(self, _: &mut This, ctx: Ctx) -> Result<usize, Self::Error>;
}

Tries to write Self into This using the context Ctx To implement writing into an arbitrary byte buffer, implement TryIntoCtx

Example

use scroll::{self, ctx, LE, Endian, Pwrite};
#[derive(Debug, PartialEq, Eq)]
pub struct Foo(u16);

// this will use the default `DefaultCtx = scroll::Endian`
impl ctx::TryIntoCtx<Endian> for Foo {
    // you can use your own error here too, but you will then need to specify it in fn generic parameters
    type Error = scroll::Error;
    // you can write using your own context type, see `leb128.rs`
    fn try_into_ctx(self, this: &mut [u8], le: Endian) -> Result<usize, Self::Error> {
        if this.len() < 2 { return Err((scroll::Error::Custom("whatever".to_string())).into()) }
        this.pwrite_with(self.0, 0, le)?;
        Ok(2)
    }
}
// now we can write a `Foo` into some buffer (in this case, a byte buffer, because that's what we implemented it for above)

let mut bytes: [u8; 4] = [0, 0, 0, 0];
bytes.pwrite_with(Foo(0x7f), 1, LE).unwrap();

Associated Types

type Error[src]

Loading content...

Required methods

fn try_into_ctx(self, _: &mut This, ctx: Ctx) -> Result<usize, Self::Error>[src]

Loading content...

Implementations on Foreign Types

impl TryIntoCtx<Endian, [u8]> for u8 where
    u8: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a u8[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for i8 where
    i8: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a i8[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for u16 where
    u16: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a u16[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for i16 where
    i16: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a i16[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for u32 where
    u32: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a u32[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for i32 where
    i32: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a i32[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for u64 where
    u64: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a u64[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for i64 where
    i64: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a i64[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for u128 where
    u128: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a u128[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for i128 where
    i128: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a i128[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for f32 where
    f32: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a f32[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for f64 where
    f64: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<Endian, [u8]> for &'a f64[src]

type Error = Error

impl<'a> TryIntoCtx<(), [u8]> for &'a [u8][src]

type Error = Error

impl<'a> TryIntoCtx<(), [u8]> for &'a str[src]

type Error = Error

impl TryIntoCtx<Endian, [u8]> for usize where
    usize: IntoCtx<Endian>, [src]

type Error = Error

impl<'a> TryIntoCtx<(), [u8]> for &'a CStr[src]

type Error = Error

impl TryIntoCtx<(), [u8]> for CString[src]

type Error = Error

Loading content...

Implementors

Loading content...