feat: enable construct event constantly

Signed-off-by: tison <[email protected]>

src/epoll.rs

@@ -337,7 +337,7 @@ pub struct EventExtra {
 impl EventExtra {
     /// Create an empty version of the data.
     #[inline]
-    pub fn empty() -> EventExtra {
+    pub const fn empty() -> EventExtra {
         EventExtra {
             flags: epoll::EventFlags::empty(),
         }

src/iocp/mod.rs

@@ -651,7 +651,7 @@ pub struct EventExtra {
 impl EventExtra {
     /// Create a new, empty version of this struct.
     #[inline]
-    pub fn empty() -> EventExtra {
+    pub const fn empty() -> EventExtra {
         EventExtra {
             flags: AfdPollMask::empty(),
         }

src/kqueue.rs

@@ -268,7 +268,7 @@ pub struct EventExtra;
 impl EventExtra {
     /// Create a new, empty version of this struct.
     #[inline]
-    pub fn empty() -> EventExtra {
+    pub const fn empty() -> EventExtra {
         EventExtra
     }
 

src/lib.rs

@@ -186,7 +186,7 @@ impl Event {
     /// All kinds of events (readable and writable).
     ///
     /// Equivalent to: `Event { key, readable: true, writable: true }`
-    pub fn all(key: usize) -> Event {
+    pub const fn all(key: usize) -> Event {
         Event {
             key,
             readable: true,
@@ -198,7 +198,7 @@ impl Event {
     /// Only the readable event.
     ///
     /// Equivalent to: `Event { key, readable: true, writable: false }`
-    pub fn readable(key: usize) -> Event {
+    pub const fn readable(key: usize) -> Event {
         Event {
             key,
             readable: true,
@@ -210,7 +210,7 @@ impl Event {
     /// Only the writable event.
     ///
     /// Equivalent to: `Event { key, readable: false, writable: true }`
-    pub fn writable(key: usize) -> Event {
+    pub const fn writable(key: usize) -> Event {
         Event {
             key,
             readable: false,
@@ -222,7 +222,7 @@ impl Event {
     /// No events.
     ///
     /// Equivalent to: `Event { key, readable: false, writable: false }`
-    pub fn none(key: usize) -> Event {
+    pub const fn none(key: usize) -> Event {
         Event {
             key,
             readable: false,

src/port.rs

@@ -221,7 +221,7 @@ pub struct EventExtra {
 impl EventExtra {
     /// Create a new, empty version of this struct.
     #[inline]
-    pub fn empty() -> EventExtra {
+    pub const fn empty() -> EventExtra {
         EventExtra {
             flags: PollFlags::empty(),
         }