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/*
 * Copyright 2015 Joshua R. Rodgers
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#![macro_use]

pub unsafe trait ComObject<TVtable> {
    #[inline]
    fn vtable(&self) -> &TVtable;

    #[inline]
    fn this<TThis>(&self) -> &TThis where Self: Sized {
        unsafe { ::std::mem::transmute(self) }
    }
}

#[macro_export]
macro_rules! impl_com_object {
    ($target:ty : $($vtable:ty),+) => {
        $(
            unsafe impl $crate::com::ComObject<$vtable> for $target {
                #[inline]
                fn vtable(&self) -> &$vtable {
                    unsafe { &*(self.vtable as *const $vtable) }
                }
            }
        )+
    }
}