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Geoff RomerandJon Meow
6ac3adfa53
`Pattern` is intended to pilot some changes I would like to apply to all our sum types: - The alternatives are expressed as derived classes rather than members of a `std::variant`. - The alternatives are classes in the [style guide sense](https://google.github.io/styleguide/cppguide.html#Structs_vs._Classes), meaning they can have invariants, but can't have public data members. - Creating an object is expressed using a constructor rather than a factory function. - Accessing an alternative is expressed as a cast (using LLVM's RTTI system) rather than `std::get` or a `Get` method. Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
31 lines
804 B
C++
31 lines
804 B
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "executable_semantics/ast/member.h"
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namespace Carbon {
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auto Member::MakeFieldMember(int line_num, const BindingPattern* binding)
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-> Member* {
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auto m = new Member();
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m->line_num = line_num;
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m->value = FieldMember({.binding = binding});
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return m;
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}
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auto Member::GetFieldMember() const -> const FieldMember& {
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return std::get<FieldMember>(value);
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}
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void Member::Print(llvm::raw_ostream& out) const {
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switch (tag()) {
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case MemberKind::FieldMember:
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const auto& field = GetFieldMember();
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out << "var " << field.binding << ";\n";
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break;
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}
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}
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} // namespace Carbon
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