From 693ac892f2db5db1ce7cf86db7bf6207b3515c42 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 13 Jul 2020 16:16:53 +0200
Subject: Don't copy-paste `impl_froms` into every crate

---
 crates/stdx/src/macros.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'crates/stdx/src')

diff --git a/crates/stdx/src/macros.rs b/crates/stdx/src/macros.rs
index 0f7690a67..bf298460f 100644
--- a/crates/stdx/src/macros.rs
+++ b/crates/stdx/src/macros.rs
@@ -17,3 +17,24 @@ macro_rules! format_to {
         { use ::std::fmt::Write as _; let _ = ::std::write!($buf, $lit $($arg)*); }
     };
 }
+
+// Generates `From` impls for `Enum E { Foo(Foo), Bar(Bar) }` enums
+#[macro_export]
+macro_rules! impl_from {
+    ($($variant:ident $(($($sub_variant:ident),*))?),* for $enum:ident) => {
+        $(
+            impl From<$variant> for $enum {
+                fn from(it: $variant) -> $enum {
+                    $enum::$variant(it)
+                }
+            }
+            $($(
+                impl From<$sub_variant> for $enum {
+                    fn from(it: $sub_variant) -> $enum {
+                        $enum::$variant($variant::$sub_variant(it))
+                    }
+                }
+            )*)?
+        )*
+    }
+}
-- 
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