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use crate::result::FfiResult;
use std::os::raw::c_void;
use std::ptr;
pub trait Callback {
type Args: CallbackArgs;
fn call(&self, user_data: *mut c_void, error: *const FfiResult, args: Self::Args);
}
impl Callback for extern "C" fn(user_data: *mut c_void, result: *const FfiResult) {
type Args = ();
fn call(&self, user_data: *mut c_void, error: *const FfiResult, _args: Self::Args) {
self(user_data, error)
}
}
impl<T: CallbackArgs> Callback
for extern "C" fn(user_data: *mut c_void, result: *const FfiResult, a: T)
{
type Args = T;
fn call(&self, user_data: *mut c_void, error: *const FfiResult, args: Self::Args) {
self(user_data, error, args)
}
}
impl<T: CallbackArgs> Callback
for unsafe extern "C" fn(user_data: *mut c_void, result: *const FfiResult, a: T)
{
type Args = T;
fn call(&self, user_data: *mut c_void, error: *const FfiResult, args: Self::Args) {
unsafe { self(user_data, error, args) }
}
}
impl<T0: CallbackArgs, T1: CallbackArgs> Callback
for extern "C" fn(user_data: *mut c_void, result: *const FfiResult, a0: T0, a1: T1)
{
type Args = (T0, T1);
fn call(&self, user_data: *mut c_void, error: *const FfiResult, args: Self::Args) {
self(user_data, error, args.0, args.1)
}
}
impl<T0: CallbackArgs, T1: CallbackArgs, T2: CallbackArgs> Callback
for extern "C" fn(user_data: *mut c_void, result: *const FfiResult, a0: T0, a1: T1, a2: T2)
{
type Args = (T0, T1, T2);
fn call(&self, user_data: *mut c_void, error: *const FfiResult, args: Self::Args) {
self(user_data, error, args.0, args.1, args.2)
}
}
pub trait CallbackArgs {
fn default() -> Self;
}
impl CallbackArgs for () {
fn default() -> Self {}
}
impl CallbackArgs for bool {
fn default() -> Self {
false
}
}
impl CallbackArgs for u32 {
fn default() -> Self {
0
}
}
impl CallbackArgs for i32 {
fn default() -> Self {
0
}
}
impl CallbackArgs for i64 {
fn default() -> Self {
0
}
}
impl CallbackArgs for u64 {
fn default() -> Self {
0
}
}
impl CallbackArgs for usize {
fn default() -> Self {
0
}
}
impl<T> CallbackArgs for *const T {
fn default() -> Self {
ptr::null()
}
}
impl<T> CallbackArgs for *mut T {
fn default() -> Self {
ptr::null_mut()
}
}
impl CallbackArgs for [u8; 32] {
fn default() -> Self {
[0; 32]
}
}
impl<T0: CallbackArgs, T1: CallbackArgs> CallbackArgs for (T0, T1) {
fn default() -> Self {
(CallbackArgs::default(), CallbackArgs::default())
}
}
impl<T0: CallbackArgs, T1: CallbackArgs, T2: CallbackArgs> CallbackArgs for (T0, T1, T2) {
fn default() -> Self {
(
CallbackArgs::default(),
CallbackArgs::default(),
CallbackArgs::default(),
)
}
}
impl<T0: CallbackArgs, T1: CallbackArgs, T2: CallbackArgs, T3: CallbackArgs> CallbackArgs
for (T0, T1, T2, T3)
{
fn default() -> Self {
(
CallbackArgs::default(),
CallbackArgs::default(),
CallbackArgs::default(),
CallbackArgs::default(),
)
}
}