interfaces, impls, and constrained generics (basics) (#1073)

* interfaces, impls, and constrained generics (basics) * separate type checking into declare vs. type check, removing redundancy * external impls * added impl scopes to handle generics calling generics * cleanup * more cleanup * Update executable_semantics/testdata/interface/external_impl_point_vector.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/generic_call_generic.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/tuple_vector_add_scale.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * Update executable_semantics/testdata/interface/vector_point_add_scale.carbon Co-authored-by: josh11b <josh11b@users.noreply.github.com> * change ImplementationDeclaration to ImplDeclaration * remove impl_type_value * split NamedEntity into two * changed GetName to be a free function * adding comments * more edits to respond to review * introduce ImplBinding, remove punning on GenericBinding * new test case and some minor edits * refactor GetMember and GetField to move impl logic to interpreter * remove commennt * change EntityView to ImplBinding in FieldAccess... * move ImplBinding * review response * added example to impl_scope.h * minor edits * Update executable_semantics/interpreter/field_path.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/interpreter/value.cpp Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/interpreter/interpreter.cpp Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/expression.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/expression.h Co-authored-by: Geoff Romer <gromer@google.com> * Update executable_semantics/ast/generic_binding.h Co-authored-by: Geoff Romer <gromer@google.com> * more edits from review * review response * Update executable_semantics/ast/static_scope.h Co-authored-by: Geoff Romer <gromer@google.com> * remove ImplType, renamed node_view to value_node Co-authored-by: josh11b <josh11b@users.noreply.github.com> Co-authored-by: Geoff Romer <gromer@google.com>
2026-09-24 22:02:23 +01:00 · 2022-03-02 15:58:45 -05:00
parent 8f6e42d866
commit 7cce1bd124
43 changed files with 1722 additions and 441 deletions
@@ -0,0 +1,43 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+// RUN: %{executable_semantics} %s 2>&1 | \
+// RUN:   %{FileCheck} --match-full-lines --allow-unused-prefixes=false %s
+// RUN: %{executable_semantics} --trace %s 2>&1 | \
+// RUN:   %{FileCheck} --match-full-lines --allow-unused-prefixes %s
+// AUTOUPDATE: %{executable_semantics} %s
+// CHECK: result: 0
+
+package ExecutableSemanticsTest api;
+
+interface Vector {
+  fn Add[me: Self](b: Self) -> Self;
+  fn Scale[me: Self](v: i32) -> Self;
+}
+
+class Point {
+  var x: i32;
+  var y: i32;
+  impl Point as Vector {
+    fn Add[me: Point](b: Point) -> Point {
+        return {.x = me.x + b.x, .y = me.y + b.y};
+    }
+    fn Scale[me: Point](v: i32) -> Point {
+        return {.x = me.x * v, .y = me.y * v};
+    }
+  }
+}
+
+fn AddAndScaleGeneric[T:! Vector](t: (T, T), s: i32) -> T {
+  var m: auto = t[0].Add;
+  var n: auto = m(t[1]).Scale;
+  return n(s);
+}
+
+fn Main() -> i32 {
+  var a: Point = {.x = 1, .y = 1};
+  var b: Point = {.x = 2, .y = 3};
+  var p: Point = AddAndScaleGeneric((a, b), 5);
+  return p.x - 15;
+}