Allow Id/u64 equality comparisons

This will allow comparing, for example, a `ChannelId` with a `u64`
directly, bypassing the need to do something like:

```rust
let channel_id = ChannelId(7);

assert!(channel_id.0 == 7);

// can now be replaced with:
assert!(channel_id == 7);
```

2 files changed, 14 insertions, 2 deletions

diff --git a/examples/06_command_framework.rs b/examples/06_command_framework.rs
index b93b952..c7300aa 100644
--- a/examples/06_command_framework.rs
+++ b/examples/06_command_framework.rs
@@ -55,7 +55,7 @@ fn ping_command(_context: Context, message: Message, _args: Vec<String>) {
 
 fn owner_check(_context: &Context, message: &Message) -> bool {
     // Replace 7 with your ID
-    message.author.id.0 == 7u64
+    message.author.id == 7
 }
 
 fn some_complex_command(context: Context, _msg: Message, args: Vec<String>) {
diff --git a/src/model/mod.rs b/src/model/mod.rs
index f00dffb..0b93823 100644
--- a/src/model/mod.rs
+++ b/src/model/mod.rs
@@ -56,7 +56,7 @@ macro_rules! id {
     ($(#[$attr:meta] $name:ident;)*) => {
         $(
             #[$attr]
-            #[derive(Copy, Clone, Debug, Eq, Hash, PartialEq, PartialOrd, Ord)]
+            #[derive(Copy, Clone, Debug, Eq, Hash, PartialOrd, Ord)]
             pub struct $name(pub u64);
 
             impl $name {
@@ -76,6 +76,18 @@ macro_rules! id {
                     $name(id_as_u64)
                 }
             }
+
+            impl PartialEq for $name {
+                fn eq(&self, other: &Self) -> bool {
+                    self.0 == other.0
+                }
+            }
+
+            impl PartialEq<u64> for $name {
+                fn eq(&self, u: &u64) -> bool {
+                    self.0 == *u
+                }
+            }
         )*
     }
 }