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AK: Add Formatter<FixedPoint<...>> without floating point

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Rather than casting the FixedPoint to double, format the FixedPoint
directly. This avoids using floating point instruction, which in
turn enables this to be used even in the kernel.
This commit is contained in:
Tom 2021-12-27 18:23:04 -07:00 • committed by Linus Groh
parent 77b3230c80
commit f021baf255
4 changed files with 124 additions and 15 deletions
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9
Tests/AK/TestFixedPoint.cpp
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@ -72,3 +72,12 @@ TEST_CASE(rounding)
EXPECT_EQ(Type(-1.5).lceil(), -1);
EXPECT_EQ(Type(-1.5).ltrunk(), -1);
}
TEST_CASE(formatter)
{
EXPECT_EQ(String::formatted("{}", FixedPoint<16>(123.456)), "123.455993"sv);
EXPECT_EQ(String::formatted("{}", FixedPoint<16>(-123.456)), "-123.455994"sv);
EXPECT_EQ(String::formatted("{}", FixedPoint<4>(123.456)), "123.4375"sv);
EXPECT_EQ(String::formatted("{}", FixedPoint<4>(-123.456)), "-123.4375"sv);
EXPECT_EQ(String::formatted("{}", FixedPoint<16> {}), "0"sv);
}