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AK: Add FixedPoint cast operator for up/downcasting to other sizes

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This enables casting between different size FixedPoint variables or
constructing them from other sized FixedPoint values.
This commit is contained in:
Tom 2022-01-20 21:31:13 -07:00 • committed by Linus Groh
parent 06fc72ca0c
commit c468a9cc2d
2 changed files with 61 additions and 0 deletions
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32
Tests/AK/TestFixedPoint.cpp
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@ -73,6 +73,38 @@ TEST_CASE(rounding)
EXPECT_EQ(Type(-1.5).ltrunk(), -1);
}
TEST_CASE(cast)
{
FixedPoint<16, u32> downcast_value1(FixedPoint<32, u64>(123.4567));
EXPECT((double)downcast_value1 >= 123.4566 && (double)downcast_value1 <= 123.4568);
static constexpr FixedPoint<32, u64> value1(321.7654);
downcast_value1 = value1;
EXPECT((double)downcast_value1 >= 321.7653 && (double)downcast_value1 <= 321.7655);
FixedPoint<6, u32> downcast_value2(FixedPoint<32, u64>(4567.123456));
EXPECT((double)downcast_value2 >= 4567.1 && (double)downcast_value2 <= 4567.2);
downcast_value2 = FixedPoint<32, u64>(7654.654321);
EXPECT((double)downcast_value2 >= 7654.64 && (double)downcast_value2 <= 7654.66);
EXPECT((double)downcast_value2 >= 7654.64 && (double)downcast_value2 <= 7654.66);
FixedPoint<6, u32> downcast_value3(FixedPoint<32, u64>(4567.987654));
EXPECT((double)downcast_value3 >= 4567.9 && (double)downcast_value3 <= 4567.99);
downcast_value3 = FixedPoint<32, u64>(7654.456789);
EXPECT((double)downcast_value3 >= 7654.45 && (double)downcast_value3 <= 7654.46);
FixedPoint<32, u64> upcast_value1(FixedPoint<16, u32>(123.4567));
EXPECT((double)upcast_value1 >= 123.4566 && (double)upcast_value1 <= 123.4568);
upcast_value1 = FixedPoint<16, u32>(321.7654);
EXPECT((double)upcast_value1 >= 321.7653 && (double)upcast_value1 <= 321.7655);
FixedPoint<32, u64> upcast_value2(FixedPoint<6, u32>(4567.123456));
EXPECT((double)upcast_value2 >= 4567.1 && (double)upcast_value2 <= 4567.2);
upcast_value2 = FixedPoint<6, u32>(7654.654321);
EXPECT((double)upcast_value2 >= 7654.64 && (double)upcast_value2 <= 7654.66);
FixedPoint<32, u64> upcast_value3(FixedPoint<6, u32>(4567.987654));
EXPECT((double)upcast_value3 >= 4567.9 && (double)upcast_value3 <= 4567.99);
upcast_value3 = FixedPoint<6, u32>(7654.456789);
EXPECT((double)upcast_value3 >= 7654.45 && (double)upcast_value3 <= 7654.46);
}
TEST_CASE(formatter)
{
EXPECT_EQ(String::formatted("{}", FixedPoint<16>(123.456)), "123.455993"sv);