diff options
Diffstat (limited to 'compiler/rustc_data_structures/src/macros.rs')
-rw-r--r-- | compiler/rustc_data_structures/src/macros.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/compiler/rustc_data_structures/src/macros.rs b/compiler/rustc_data_structures/src/macros.rs new file mode 100644 index 000000000..e05491f6f --- /dev/null +++ b/compiler/rustc_data_structures/src/macros.rs @@ -0,0 +1,37 @@ +#[macro_export] +macro_rules! enum_from_u32 { + ($(#[$attr:meta])* pub enum $name:ident { + $($(#[$var_attr:meta])* $variant:ident = $e:expr,)* + }) => { + $(#[$attr])* + pub enum $name { + $($(#[$var_attr])* $variant = $e),* + } + + impl $name { + pub fn from_u32(u: u32) -> Option<$name> { + $(if u == $name::$variant as u32 { + return Some($name::$variant) + })* + None + } + } + }; + ($(#[$attr:meta])* pub enum $name:ident { + $($(#[$var_attr:meta])* $variant:ident,)* + }) => { + $(#[$attr])* + pub enum $name { + $($(#[$var_attr])* $variant,)* + } + + impl $name { + pub fn from_u32(u: u32) -> Option<$name> { + $(if u == $name::$variant as u32 { + return Some($name::$variant) + })* + None + } + } + } +} |