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feat(templates): add three-way comparison operator support

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This commit is contained in:
_Redstone_c_
2022-03-09 23:17:54 +08:00
parent babc7327eb
commit c2aecef3dd
6 changed files with 457 additions and 0 deletions
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1
Redcraft.Utility/Source/Private/Testing/ConceptsTesting.cpp
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@ -1,5 +1,6 @@
#include "Testing/ConceptsTesting.h"
#include "Miscellaneous/AssertionMacros.h"
#include "Templates/Templates.h"
#include "Concepts/Concepts.h"
NAMESPACE_REDCRAFT_BEGIN

129
Redcraft.Utility/Source/Private/Testing/TemplatesTesting.cpp
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@ -10,6 +10,7 @@ void TestTemplates()
{
TestInvoke();
TestReferenceWrapper();
TestCompare();
TestMiscellaneous();
}
@ -68,6 +69,134 @@ void TestReferenceWrapper()
NAMESPACE_UNNAMED_BEGIN
struct FTestPartialOrdering
{
int32 Num;
bool bIsValid;
FTestPartialOrdering(int32 InNum, bool bInIsValid = true) : Num(InNum), bIsValid(bInIsValid) { }
friend bool operator==(FTestPartialOrdering LHS, FTestPartialOrdering RHS) { return LHS.bIsValid && RHS.bIsValid ? LHS.Num == RHS.Num : false; }
friend partial_ordering operator<=>(FTestPartialOrdering LHS, FTestPartialOrdering RHS) { return LHS.bIsValid && RHS.bIsValid ? LHS.Num <=> RHS.Num : partial_ordering::unordered; }
};
struct FTestWeakOrdering
{
int32 Num;
FTestWeakOrdering(int32 InNum) : Num(InNum) { }
friend bool operator==(FTestWeakOrdering LHS, FTestWeakOrdering RHS) { return LHS.Num == RHS.Num; }
friend weak_ordering operator<=>(FTestWeakOrdering LHS, FTestWeakOrdering RHS) { return LHS.Num <=> RHS.Num; }
};
struct FTestStrongOrdering
{
int32 Num;
FTestStrongOrdering(int32 InNum) : Num(InNum) { }
friend bool operator==(FTestStrongOrdering LHS, FTestStrongOrdering RHS) { return LHS.Num == RHS.Num; }
friend strong_ordering operator<=>(FTestStrongOrdering LHS, FTestStrongOrdering RHS) { return LHS.Num <=> RHS.Num; }
};
NAMESPACE_UNNAMED_END
void TestCompare()
{
always_check((-1 <=> 0) == strong_ordering::less);
always_check(( 0 <=> 0) == strong_ordering::equivalent);
always_check(( 0 <=> 0) == strong_ordering::equal);
always_check(( 0 <=> -1) == strong_ordering::greater);
always_check((-1 <=> 0) < 0);
always_check((-1 <=> 0) <= 0);
always_check(( 0 <=> 0) <= 0);
always_check(( 0 <=> 0) == 0);
always_check(( 0 <=> 0) >= 0);
always_check(( 0 <=> -1) >= 0);
always_check(( 0 <=> -1) > 0);
always_check((-1 <=> 1) != 0);
int64 NaNBit = 0xFFF8000000000000;
double NaN = *reinterpret_cast<double*>(&NaNBit);
always_check((-1.0 <=> 0.0) == partial_ordering::less);
always_check(( 0.0 <=> 0.0) == partial_ordering::equivalent);
always_check(( 0.0 <=> -1.0) == partial_ordering::greater);
always_check(( 0.0 <=> NaN) == partial_ordering::unordered);
always_check((-1.0 <=> 0.0) == weak_ordering::less);
always_check(( 0.0 <=> 0.0) == weak_ordering::equivalent);
always_check(( 0.0 <=> -1.0) == weak_ordering::greater);
always_check((-1.0 <=> 0.0) == strong_ordering::less);
always_check(( 0.0 <=> 0.0) == strong_ordering::equivalent);
always_check(( 0.0 <=> 0.0) == strong_ordering::equal);
always_check(( 0.0 <=> -1.0) == strong_ordering::greater);
always_check((-1.0 <=> 0.0) < 0);
always_check((-1.0 <=> 0.0) <= 0);
always_check(( 0.0 <=> 0.0) <= 0);
always_check(( 0.0 <=> 0.0) == 0);
always_check(( 0.0 <=> 0.0) >= 0);
always_check(( 0.0 <=> -1.0) >= 0);
always_check(( 0.0 <=> -1.0) > 0);
always_check((-1.0 <=> 1.0) != 0);
always_check((FTestPartialOrdering(-1) <=> FTestPartialOrdering( 0)) == partial_ordering::less);
always_check((FTestPartialOrdering( 0) <=> FTestPartialOrdering( 0)) == partial_ordering::equivalent);
always_check((FTestPartialOrdering( 0) <=> FTestPartialOrdering(-1)) == partial_ordering::greater);
always_check((FTestPartialOrdering( 0, true) <=> FTestPartialOrdering( 0, false)) == partial_ordering::unordered);
always_check((FTestWeakOrdering(-1) <=> FTestWeakOrdering( 0)) == weak_ordering::less);
always_check((FTestWeakOrdering( 0) <=> FTestWeakOrdering( 0)) == weak_ordering::equivalent);
always_check((FTestWeakOrdering( 0) <=> FTestWeakOrdering(-1)) == weak_ordering::greater);
always_check((FTestStrongOrdering(-1) <=> FTestStrongOrdering( 0)) == strong_ordering::less);
always_check((FTestStrongOrdering( 0) <=> FTestStrongOrdering( 0)) == strong_ordering::equivalent);
always_check((FTestStrongOrdering( 0) <=> FTestStrongOrdering( 0)) == strong_ordering::equal);
always_check((FTestStrongOrdering( 0) <=> FTestStrongOrdering(-1)) == strong_ordering::greater);
always_check((FTestPartialOrdering(-1) < FTestPartialOrdering( 0)));
always_check((FTestPartialOrdering( 0) == FTestPartialOrdering( 0)));
always_check((FTestPartialOrdering( 0) > FTestPartialOrdering(-1)));
always_check((FTestWeakOrdering(-1) < FTestWeakOrdering( 0)));
always_check((FTestWeakOrdering( 0) == FTestWeakOrdering( 0)));
always_check((FTestWeakOrdering( 0) > FTestWeakOrdering(-1)));
always_check((FTestStrongOrdering(-1) < FTestStrongOrdering( 0)));
always_check((FTestStrongOrdering( 0) == FTestStrongOrdering( 0)));
always_check((FTestStrongOrdering( 0) > FTestStrongOrdering(-1)));
always_check((TIsSame<TCommonComparisonCategory<strong_ordering >::Type, strong_ordering >::Value));
always_check((TIsSame<TCommonComparisonCategory<strong_ordering, weak_ordering >::Type, weak_ordering >::Value));
always_check((TIsSame<TCommonComparisonCategory<strong_ordering, weak_ordering, partial_ordering>::Type, partial_ordering>::Value));
always_check(CThreeWayComparable<int32>);
always_check(CThreeWayComparable<FTestPartialOrdering>);
always_check(CThreeWayComparable<FTestWeakOrdering>);
always_check(CThreeWayComparable<FTestStrongOrdering>);
always_check((CThreeWayComparableWith<bool, bool>));
always_check((CThreeWayComparableWith<int16, int32>));
always_check((TIsSame<TCompareThreeWayResult<int32 >::Type, strong_ordering >::Value));
always_check((TIsSame<TCompareThreeWayResult<float >::Type, partial_ordering>::Value));
always_check((TIsSame<TCompareThreeWayResult<FTestPartialOrdering>::Type, partial_ordering>::Value));
always_check((TIsSame<TCompareThreeWayResult<FTestWeakOrdering >::Type, weak_ordering >::Value));
always_check((TIsSame<TCompareThreeWayResult<FTestStrongOrdering >::Type, strong_ordering >::Value));
always_check((TCompareThreeWay<int32>()(0, 0) == strong_ordering::equal));
always_check((TCompareThreeWay<void>() (0, 0.0) == strong_ordering::equal));
always_check((StrongOrder(0, 0) == strong_ordering::equal));
always_check((WeakOrder(0, 0) == strong_ordering::equal));
always_check((PartialOrder(0, 0) == strong_ordering::equal));
always_check((CompareStrongOrderFallback(0, 0) == strong_ordering::equal));
always_check((CompareWeakOrderFallback(0, 0) == strong_ordering::equal));
always_check((ComparePartialOrderFallback(0, 0) == strong_ordering::equal));
}
NAMESPACE_UNNAMED_BEGIN
template <typename T>
struct TTestStructA
{