Struct dlopen::symbor::Container

pub struct Container<T> where
    T: SymBorApi<'static>,  { /* fields omitted */ }

Container for both dynamic link library handle and its API.

This structure solves an important issue: object oriented programming where the given structure has two objects and one of the objects has a reference to the second one. Normally you can’t put Library and a structure that implements SymBorApi into one structure. This structure allows you to do it.

#Example

#[macro_use]
extern crate dlopen_derive;
extern crate dlopen;
use dlopen::symbor::{Library, Symbol, Ref, PtrOrNull, SymBorApi, Container};

 #[derive(SymBorApi)]
 struct ExampleApi<'a> {
    pub fun: Symbol<'a, unsafe extern "C" fn(i32) -> i32>,
    pub glob_i32: Ref<'a, i32>,
    pub maybe_c_str: PtrOrNull<'a, u8>,
 }

fn main(){
    let cont: Container<ExampleApi> = unsafe{Container::load("libexample.so")}
        .expect("Could not load library or symbols");
    println!("fun(4)={}", unsafe{(cont.fun)(4)});
    println!("glob_i32={}", *cont.glob_i32);
    println!("The pointer is null={}", cont.maybe_c_str.is_null());
}

Implementations

impl<T> Container<T> where
    T: SymBorApi<'static>, 

pub unsafe fn load<S>(name: S) -> Result<Self, Error> where
    S: AsRef<OsStr>, 

Open dynamic link library and load symbols.

pub unsafe fn load_self() -> Result<Self, Error>

Load all symbols from the program itself.

This allows a shared library to load symbols of the program it was loaded into.

Trait Implementations

impl<T> Deref for Container<T> where
    T: SymBorApi<'static>, 

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for Container<T> where
    T: SymBorApi<'static>, 

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.