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Switch Member to use inheritance+cast (#713)

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This commit is contained in:
Jon Meow
2021-08-06 15:27:31 -07:00
committed by GitHub
parent 6164cdfd6d
commit 4e0307efbc
5 changed files with 60 additions and 46 deletions
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executable_semantics/ast/member.cpp
+6 -15
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@@ -5,26 +5,17 @@
#include "executable_semantics/ast/member.h"
#include "executable_semantics/common/arena.h"
#include "llvm/Support/Casting.h"
namespace Carbon {
auto Member::MakeFieldMember(int line_num, const BindingPattern* binding)
-> Member* {
auto m = global_arena->New<Member>();
m->line_num = line_num;
m->value = FieldMember({.binding = binding});
return m;
}
auto Member::GetFieldMember() const -> const FieldMember& {
return std::get<FieldMember>(value);
}
using llvm::cast;
void Member::Print(llvm::raw_ostream& out) const {
switch (tag()) {
case MemberKind::FieldMember:
const auto& field = GetFieldMember();
out << "var " << field.binding << ";\n";
switch (Tag()) {
case Kind::FieldMember:
const auto& field = cast<FieldMember>(*this);
out << "var " << field.Binding() << ";\n";
break;
}
}