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AK: Add FlyString, a simple flyweight string class

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FlyString is a flyweight string class that wraps a RefPtr<StringImpl>
known to be unique among the set of FlyStrings. The class is very
unoptimized at the moment.

When to use FlyString:

- When you want O(1) string comparison
- When you want to deduplicate a lot of identical strings

When not to use FlyString:

- For strings that don't need either of the above features
- For strings that are likely to be unique
This commit is contained in:
Andreas Kling 2020-03-22 10:12:55 +01:00
parent 0395b25e3f
commit 4f72f6b886
15 changed files with 236 additions and 32 deletions
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22
AK/Tests/TestString.cpp
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@ -26,7 +26,9 @@
#include <AK/TestSuite.h>
#include <AK/FlyString.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
TEST_CASE(construct_empty)
{
@ -137,4 +139,24 @@ TEST_CASE(to_uppercase)
EXPECT(String("AbC").to_uppercase() == "ABC");
}
TEST_CASE(flystring)
{
{
FlyString a("foo");
FlyString b("foo");
EXPECT_EQ(a.impl(), b.impl());
}
{
String a = "foo";
FlyString b = a;
StringBuilder builder;
builder.append('f');
builder.append("oo");
FlyString c = builder.to_string();
EXPECT_EQ(a.impl(), b.impl());
EXPECT_EQ(a.impl(), c.impl());
}
}
TEST_MAIN(String)