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use std::ops::{Deref, DerefMut};
use super::*;
pub struct XSmartPointer<'a, T> {
xconn: &'a XConnection,
pub ptr: *mut T,
}
impl<'a, T> XSmartPointer<'a, T> {
pub fn new(xconn: &'a XConnection, ptr: *mut T) -> Option<Self> {
if !ptr.is_null() {
Some(XSmartPointer { xconn, ptr })
} else {
None
}
}
}
impl<'a, T> Deref for XSmartPointer<'a, T> {
type Target = T;
fn deref(&self) -> &T {
unsafe { &*self.ptr }
}
}
impl<'a, T> DerefMut for XSmartPointer<'a, T> {
fn deref_mut(&mut self) -> &mut T {
unsafe { &mut *self.ptr }
}
}
impl<'a, T> Drop for XSmartPointer<'a, T> {
fn drop(&mut self) {
unsafe {
(self.xconn.xlib.XFree)(self.ptr as *mut _);
}
}
}
impl XConnection {
pub fn alloc_class_hint(&self) -> XSmartPointer<'_, ffi::XClassHint> {
XSmartPointer::new(self, unsafe { (self.xlib.XAllocClassHint)() })
.expect("`XAllocClassHint` returned null; out of memory")
}
pub fn alloc_size_hints(&self) -> XSmartPointer<'_, ffi::XSizeHints> {
XSmartPointer::new(self, unsafe { (self.xlib.XAllocSizeHints)() })
.expect("`XAllocSizeHints` returned null; out of memory")
}
pub fn alloc_wm_hints(&self) -> XSmartPointer<'_, ffi::XWMHints> {
XSmartPointer::new(self, unsafe { (self.xlib.XAllocWMHints)() })
.expect("`XAllocWMHints` returned null; out of memory")
}
}