Emit anonymous functions as constexpr or mutable lambdas

hsutter · hsutter · commit b9e73e06f93c · 2023-12-02T16:24:24.000-08:00
See comment thread for previous commit: 4bd0c04
diff --git a/source/to_cpp1.h b/source/to_cpp1.h
@@ -4421,10 +4421,15 @@ class cppfront
             emit(*n.parameters);
         }
 
-        //  For an anonymous function, make the emitted lambda 'mutable'
+        //  For an anonymous function, the emitted lambda is 'constexpr' or 'mutable'
         if (!n.my_decl->has_name())
         {
-            printer.print_cpp2( " mutable", n.position() );
+            if (n.my_decl->is_constexpr) {
+                printer.print_cpp2( " constexpr", n.position() );
+            }
+            else {
+                printer.print_cpp2( " mutable", n.position() );
+            }
         }
 
         //  For now, adding implicit noexcept only for move/swap/dtor functions

Original file line number	Diff line number	Diff line change
`@@ -4421,10 +4421,15 @@ class cppfront`
`4421`	`4421`	`emit(*n.parameters);`
`4422`	`4422`	`}`
`4423`	`4423`
`4424`		`- // For an anonymous function, make the emitted lambda 'mutable'`
	`4424`	`+ // For an anonymous function, the emitted lambda is 'constexpr' or 'mutable'`
`4425`	`4425`	`if (!n.my_decl->has_name())`
`4426`	`4426`	`{`
`4427`		`- printer.print_cpp2( " mutable", n.position() );`
	`4427`	`+ if (n.my_decl->is_constexpr) {`
	`4428`	`+ printer.print_cpp2( " constexpr", n.position() );`
	`4429`	`+ }`
	`4430`	`+ else {`
	`4431`	`+ printer.print_cpp2( " mutable", n.position() );`
	`4432`	`+ }`
`4428`	`4433`	`}`
`4429`	`4434`
`4430`	`4435`	`// For now, adding implicit noexcept only for move/swap/dtor functions`