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//! Traits describing detours and applicable functions.
//!
//! Several of the traits in this module are automatically implemented and should
//! generally not be implemented by users of this library.
use error::*;

/// Generic trait exposing functionality shared between all detours.
pub unsafe trait Detour: Send + Sync {
    /// Enables or disables the detour.
    unsafe fn toggle(&mut self, enabled: bool) -> Result<()>;

    /// Enables the detour.
    unsafe fn enable(&mut self) -> Result<()> { self.toggle(true) }

    /// Disables the detour
    unsafe fn disable(&mut self) -> Result<()> { self.toggle(false) }

    /// Returns whether the detour is enabled or not.
    fn is_enabled(&self) -> bool;

    /// Returns a reference to the generated trampoline.
    fn trampoline(&self) -> &();
}

/// Trait representing a function that can be used as a target or detour for
/// detouring.
pub unsafe trait Function: Sized + Copy + Sync + 'static {
    /// The argument types as a tuple.
    type Arguments;

    /// The return type.
    type Output;

    /// Constructs a `Function` from an untyped pointer.
    unsafe fn from_ptr(ptr: *const ()) -> Self;

    /// Returns an untyped pointer for this function.
    fn to_ptr(&self) -> *const ();
}

/// Trait indicating that `Self` can be detoured by the given function `D`.
pub unsafe trait HookableWith<D: Function>: Function {}

unsafe impl<T: Function> HookableWith<T> for T {}

impl_hookable! {
    __arg_0:  A, __arg_1:  B, __arg_2:  C, __arg_3:  D, __arg_4:  E, __arg_5:  F, __arg_6:  G,
    __arg_7:  H, __arg_8:  I, __arg_9:  J, __arg_10: K, __arg_11: L, __arg_12: M, __arg_13: N
}