Explain why enum is isize

rust-diplomat · Jul 23, 2021 · 9aeec92 · 9aeec92
1 parent cd4629d
commit 9aeec92
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/tool/src/c/mod.rs b/tool/src/c/mod.rs
@@ -201,6 +201,7 @@ fn gen_type<W: fmt::Write>(
             }
 
             ast::CustomType::Enum(_) => {
+                // repr(C) fieldless enums use the default platform representation: isize
                 write!(out, "ssize_t")?;
             }
         },

diff --git a/tool/src/layout.rs b/tool/src/layout.rs
@@ -45,7 +45,10 @@ pub fn type_size_alignment(
                 (size, max_align)
             }
 
-            ast::CustomType::Enum(_) => (4, 4),
+            ast::CustomType::Enum(_) => {
+                // repr(C) fieldless enums use the default platform representation: isize
+                (4, 4)
+            },
 
             ast::CustomType::Opaque(_) => {
                 panic!("Size of opaque types is unknown")
-Original file line number
+Diff line change
@@ Expand Up / @@ -201,6 +201,7 @@ fn gen_type<W: fmt::Write>( @@
                 }
                 ast::CustomType::Enum(_) => {
+                    // repr(C) fieldless enums use the default platform representation: isize
                     write!(out, "ssize_t")?;
                 }
             },
@@ Expand Down @@