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//===- TypeSwitchTest.cpp - TypeSwitch unit tests -------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/TypeSwitch.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
/// Utility classes to setup casting functionality.
struct Base {
enum Kind { DerivedA, DerivedB, DerivedC, DerivedD, DerivedE };
Kind kind;
};
template <Base::Kind DerivedKind> struct DerivedImpl : Base {
DerivedImpl() : Base{DerivedKind} {}
static bool classof(const Base *base) { return base->kind == DerivedKind; }
};
struct DerivedA : public DerivedImpl<Base::DerivedA> {};
struct DerivedB : public DerivedImpl<Base::DerivedB> {};
struct DerivedC : public DerivedImpl<Base::DerivedC> {};
struct DerivedD : public DerivedImpl<Base::DerivedD> {};
struct DerivedE : public DerivedImpl<Base::DerivedE> {};
} // end anonymous namespace
TEST(TypeSwitchTest, CaseResult) {
auto translate = [](auto value) {
return TypeSwitch<Base *, int>(&value)
.Case<DerivedA>([](DerivedA *) { return 0; })
.Case([](DerivedB *) { return 1; })
.Case([](DerivedC *) { return 2; })
.Default([](Base *) { return -1; });
};
EXPECT_EQ(0, translate(DerivedA()));
EXPECT_EQ(1, translate(DerivedB()));
EXPECT_EQ(2, translate(DerivedC()));
EXPECT_EQ(-1, translate(DerivedD()));
}
TEST(TypeSwitchTest, CasesResult) {
auto translate = [](auto value) {
return TypeSwitch<Base *, int>(&value)
.Case<DerivedA, DerivedB, DerivedD>([](auto *) { return 0; })
.Case([](DerivedC *) { return 1; })
.Default(-1);
};
EXPECT_EQ(0, translate(DerivedA()));
EXPECT_EQ(0, translate(DerivedB()));
EXPECT_EQ(1, translate(DerivedC()));
EXPECT_EQ(0, translate(DerivedD()));
EXPECT_EQ(-1, translate(DerivedE()));
}
TEST(TypeSwitchTest, CaseVoid) {
auto translate = [](auto value) {
int result = -2;
TypeSwitch<Base *>(&value)
.Case([&](DerivedA *) { result = 0; })
.Case([&](DerivedB *) { result = 1; })
.Case([&](DerivedC *) { result = 2; })
.Default([&](Base *) { result = -1; });
return result;
};
EXPECT_EQ(0, translate(DerivedA()));
EXPECT_EQ(1, translate(DerivedB()));
EXPECT_EQ(2, translate(DerivedC()));
EXPECT_EQ(-1, translate(DerivedD()));
}
TEST(TypeSwitchTest, CasesVoid) {
auto translate = [](auto value) {
int result = -1;
TypeSwitch<Base *>(&value)
.Case<DerivedA, DerivedB, DerivedD>([&](auto *) { result = 0; })
.Case([&](DerivedC *) { result = 1; });
return result;
};
EXPECT_EQ(0, translate(DerivedA()));
EXPECT_EQ(0, translate(DerivedB()));
EXPECT_EQ(1, translate(DerivedC()));
EXPECT_EQ(0, translate(DerivedD()));
EXPECT_EQ(-1, translate(DerivedE()));
}
TEST(TypeSwitchTest, CaseOptional) {
auto translate = [](auto value) {
return TypeSwitch<Base *, std::optional<int>>(&value)
.Case([](DerivedA *) { return 0; })
.Case([](DerivedC *) { return std::nullopt; })
.Default([](Base *) { return -1; });
};
EXPECT_EQ(0, translate(DerivedA()));
EXPECT_EQ(std::nullopt, translate(DerivedC()));
EXPECT_EQ(-1, translate(DerivedD()));
EXPECT_EQ(std::nullopt,
(TypeSwitch<Base *, std::optional<int>>(nullptr).Default(
[](Base *) { return std::nullopt; })));
}
TEST(TypeSwitchTest, CasesOptional) {
auto translate = [](auto value) {
return TypeSwitch<Base *, std::optional<int>>(&value)
.Case<DerivedB, DerivedC>([](auto *) { return std::nullopt; })
.Case([](DerivedA *) { return 0; })
.Default([](Base *) { return -1; });
};
EXPECT_EQ(0, translate(DerivedA()));
EXPECT_EQ(std::nullopt, translate(DerivedB()));
EXPECT_EQ(std::nullopt, translate(DerivedC()));
EXPECT_EQ(-1, translate(DerivedD()));
}
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