155 lines
2.8 KiB
C++
155 lines
2.8 KiB
C++
// Copyright (c) 2012-2024 Wojciech Figat. All rights reserved.
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#include "Engine/Core/Types/Nullable.h"
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#include <ThirdParty/catch2/catch.hpp>
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TEST_CASE("Nullable")
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{
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SECTION("Trivial Type")
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{
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Nullable<int> a;
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REQUIRE(a.HasValue() == false);
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REQUIRE(a.GetValueOr(2) == 2);
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a = 1;
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REQUIRE(a.HasValue() == true);
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REQUIRE(a.GetValue() == 1);
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REQUIRE(a.GetValueOr(2) == 1);
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a.Reset();
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REQUIRE(a.HasValue() == false);
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}
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SECTION("Move-Only Type")
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{
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struct MoveOnly
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{
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MoveOnly() = default;
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~MoveOnly() = default;
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MoveOnly(const MoveOnly&) = delete;
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MoveOnly(MoveOnly&&) = default;
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// MoveOnly& operator=(const MoveOnly&) = delete;
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// MoveOnly& operator=(MoveOnly&&) = default;
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};
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Nullable<MoveOnly> a;
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REQUIRE(a.HasValue() == false);
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a = MoveOnly();
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REQUIRE(a.HasValue() == true);
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}
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SECTION("Bool Type")
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{
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Nullable<bool> a;
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REQUIRE(a.HasValue() == false);
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REQUIRE(a.GetValueOr(true) == true);
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REQUIRE(a.IsTrue() == false);
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REQUIRE(a.IsFalse() == false);
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a = false;
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REQUIRE(a.HasValue() == true);
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REQUIRE(a.GetValue() == false);
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REQUIRE(a.GetValueOr(true) == false);
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REQUIRE(a.IsTrue() == false);
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REQUIRE(a.IsFalse() == true);
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a = true;
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REQUIRE(a.IsTrue() == true);
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REQUIRE(a.IsFalse() == false);
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a.Reset();
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REQUIRE(a.HasValue() == false);
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}
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SECTION("Lifetime (No Construction)")
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{
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struct DoNotConstruct
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{
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DoNotConstruct() { FAIL("DoNotConstruct must not be constructed."); }
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};
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Nullable<DoNotConstruct> a;
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a.Reset();
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}
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SECTION("Lifetime")
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{
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int constructed = 0, destructed = 0;
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struct Lifetime
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{
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int& constructed;
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int& destructed;
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Lifetime(int& constructed, int& destructed)
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: constructed(constructed)
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, destructed(destructed)
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{
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constructed++;
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}
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Lifetime(const Lifetime& other)
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: constructed(other.constructed)
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, destructed(other.destructed)
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{
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constructed++;
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}
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~Lifetime()
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{
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destructed++;
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}
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};
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{
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Nullable<Lifetime> a = Lifetime(constructed, destructed);
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REQUIRE(constructed == 1);
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REQUIRE(destructed == 0);
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a.Reset();
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REQUIRE(constructed == 1);
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REQUIRE(destructed == 1);
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}
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{
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Nullable<Lifetime> a = Lifetime(constructed, destructed);
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}
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REQUIRE(constructed == 2);
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REQUIRE(destructed == 2);
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}
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SECTION("Matching")
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{
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Nullable<int> a;
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Nullable<int> b = 2;
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a.Match(
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[](int value) { FAIL("Null nullable must not match value handler."); },
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[]() {}
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);
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b.Match(
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[](int value) {},
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[]() { FAIL("Nullable with valid value must not match null handler."); }
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);
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}
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};
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