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serenity/AK/DeprecatedFlyString.cpp

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AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
AK: Add FlyString, a simple flyweight string class 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
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*/
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
#include <AK/DeprecatedFlyString.h>
AK+Everywhere: Rename String to DeprecatedString We have a new, improved string type coming up in AK (OOM aware, no null state), and while it's going to use UTF-8, the name UTF8String is a mouthful - so let's free up the String name by renaming the existing class. Making the old one have an annoying name will hopefully also help with quick adoption :^)
2022-12-04 18:02:33 +00:00
#include <AK/DeprecatedString.h>
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
#include <AK/HashTable.h>
AK: Make string-to-number conversion helpers return Optional Get rid of the weird old signature: - int StringType::to_int(bool& ok) const And replace it with sensible new signature: - Optional<int> StringType::to_int() const
2020-06-12 19:07:52 +00:00
#include <AK/Optional.h>
Kernel: Switch singletons to use new Singleton class MemoryManager cannot use the Singleton class because MemoryManager::initialize is called before the global constructors are run. That caused the Singleton to be re-initialized, causing it to create another MemoryManager instance. Fixes #3226
2020-08-25 01:35:19 +00:00
#include <AK/Singleton.h>
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
#include <AK/StringUtils.h>
AK: Reduce header dependency graph of String.h String.h no longer pulls in StringView.h. We do this by moving a bunch of String functions out-of-line.
2020-03-23 12:45:10 +00:00
#include <AK/StringView.h>
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
namespace AK {
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
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struct DeprecatedFlyStringImplTraits : public Traits<StringImpl*> {
Everywhere: Run clang-format
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static unsigned hash(StringImpl const* s) { return s ? s->hash() : 0; }
static bool equals(StringImpl const* a, StringImpl const* b)
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
{
Everywhere: Rename ASSERT => VERIFY (...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
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VERIFY(a);
VERIFY(b);
AK: Use StringImpl::operator== in FlyString
2020-10-06 15:16:39 +00:00
return *a == *b;
AK: Add FlyString, a simple flyweight string class 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
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}
};
AK: Make Deprecated{Fly,}String and StringImpl const-correct
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static Singleton<HashTable<StringImpl const*, DeprecatedFlyStringImplTraits>> s_table;
Kernel: Switch singletons to use new Singleton class MemoryManager cannot use the Singleton class because MemoryManager::initialize is called before the global constructors are run. That caused the Singleton to be re-initialized, causing it to create another MemoryManager instance. Fixes #3226
2020-08-25 01:35:19 +00:00
AK: Make Deprecated{Fly,}String and StringImpl const-correct
2023-02-19 21:59:26 +00:00
static HashTable<StringImpl const*, DeprecatedFlyStringImplTraits>& fly_impls()
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
{
Kernel: Switch singletons to use new Singleton class MemoryManager cannot use the Singleton class because MemoryManager::initialize is called before the global constructors are run. That caused the Singleton to be re-initialized, causing it to create another MemoryManager instance. Fixes #3226
2020-08-25 01:35:19 +00:00
return *s_table;
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
void DeprecatedFlyString::did_destroy_impl(Badge<StringImpl>, StringImpl& impl)
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
{
fly_impls().remove(&impl);
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
DeprecatedFlyString::DeprecatedFlyString(DeprecatedString const& string)
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
{
if (string.is_null())
return;
AK: Some FlyString improvements We're now clever enough to notice when we're constructing a FlyString from a String that is actually already a FlyString. :^)
2020-05-05 08:08:14 +00:00
if (string.impl()->is_fly()) {
m_impl = string.impl();
return;
}
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
auto it = fly_impls().find(const_cast<StringImpl*>(string.impl()));
if (it == fly_impls().end()) {
fly_impls().set(const_cast<StringImpl*>(string.impl()));
string.impl()->set_fly({}, true);
m_impl = string.impl();
} else {
Everywhere: Rename ASSERT => VERIFY (...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
2021-02-23 19:42:32 +00:00
VERIFY((*it)->is_fly());
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
m_impl = *it;
}
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
DeprecatedFlyString::DeprecatedFlyString(StringView string)
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
{
AK: Try to avoid String allocation in FlyString(StringView) If we're constructing a FlyString from a StringView, and we already have a matching StringImpl in the table, use HashTable::find() to locate the existing string without creating a temporary String.
2021-05-15 07:50:51 +00:00
if (string.is_null())
return;
auto it = fly_impls().find(string.hash(), [&](auto& candidate) {
return string == candidate;
});
if (it == fly_impls().end()) {
Everywhere: Rename to_{string => deprecated_string}() where applicable This will make it easier to support both string types at the same time while we convert code, and tracking down remaining uses. One big exception is Value::to_string() in LibJS, where the name is dictated by the ToString AO.
2022-12-06 01:12:49 +00:00
auto new_string = string.to_deprecated_string();
AK: Try to avoid String allocation in FlyString(StringView) If we're constructing a FlyString from a StringView, and we already have a matching StringImpl in the table, use HashTable::find() to locate the existing string without creating a temporary String.
2021-05-15 07:50:51 +00:00
fly_impls().set(new_string.impl());
new_string.impl()->set_fly({}, true);
m_impl = new_string.impl();
} else {
VERIFY((*it)->is_fly());
m_impl = *it;
}
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
}
AK: Generalize AK::String::to_int() for more types
2020-12-10 13:17:30 +00:00
template<typename T>
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
Optional<T> DeprecatedFlyString::to_int(TrimWhitespace trim_whitespace) const
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
{
AK: Add a way to disable the trimming of whitespace in to_*int This behavior might not always be desirable, and so this patch adds a way to disable it.
2021-06-18 16:21:27 +00:00
return StringUtils::convert_to_int<T>(view(), trim_whitespace);
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
template Optional<i8> DeprecatedFlyString::to_int(TrimWhitespace) const;
template Optional<i16> DeprecatedFlyString::to_int(TrimWhitespace) const;
template Optional<i32> DeprecatedFlyString::to_int(TrimWhitespace) const;
template Optional<i64> DeprecatedFlyString::to_int(TrimWhitespace) const;
AK: Generalize AK::String::to_int() for more types
2020-12-10 13:17:30 +00:00
template<typename T>
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
Optional<T> DeprecatedFlyString::to_uint(TrimWhitespace trim_whitespace) const
AK: Generalize AK::String::to_int() for more types
2020-12-10 13:17:30 +00:00
{
AK: Add a way to disable the trimming of whitespace in to_*int This behavior might not always be desirable, and so this patch adds a way to disable it.
2021-06-18 16:21:27 +00:00
return StringUtils::convert_to_uint<T>(view(), trim_whitespace);
AK: Generalize AK::String::to_int() for more types
2020-12-10 13:17:30 +00:00
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
template Optional<u8> DeprecatedFlyString::to_uint(TrimWhitespace) const;
template Optional<u16> DeprecatedFlyString::to_uint(TrimWhitespace) const;
template Optional<u32> DeprecatedFlyString::to_uint(TrimWhitespace) const;
template Optional<u64> DeprecatedFlyString::to_uint(TrimWhitespace) const;
AK: Generalize AK::String::to_int() for more types
2020-12-10 13:17:30 +00:00
AK: Add to_{double, float} convenience functions to all string types These are guarded with #ifndef KERNEL, since doubles (and floats) are not allowed in KERNEL mode. In StringUtils there is convert_to_floating_point which does have a template parameter incase you have a templated type.
2022-10-10 22:48:45 +00:00
#ifndef KERNEL
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
Optional<double> DeprecatedFlyString::to_double(TrimWhitespace trim_whitespace) const
AK: Add to_{double, float} convenience functions to all string types These are guarded with #ifndef KERNEL, since doubles (and floats) are not allowed in KERNEL mode. In StringUtils there is convert_to_floating_point which does have a template parameter incase you have a templated type.
2022-10-10 22:48:45 +00:00
{
return StringUtils::convert_to_floating_point<double>(view(), trim_whitespace);
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
Optional<float> DeprecatedFlyString::to_float(TrimWhitespace trim_whitespace) const
AK: Add to_{double, float} convenience functions to all string types These are guarded with #ifndef KERNEL, since doubles (and floats) are not allowed in KERNEL mode. In StringUtils there is convert_to_floating_point which does have a template parameter incase you have a templated type.
2022-10-10 22:48:45 +00:00
{
return StringUtils::convert_to_floating_point<float>(view(), trim_whitespace);
}
#endif
Everywhere: Rename equals_ignoring_case => equals_ignoring_ascii_case Let's make it clear that these functions deal with ASCII case only.
2023-03-10 07:48:54 +00:00
bool DeprecatedFlyString::equals_ignoring_ascii_case(StringView other) const
AK: Add FlyString::equals_ignoring_case(StringView) And share the code with String by moving the logic to StringUtils. :^)
2020-03-22 12:07:45 +00:00
{
Everywhere: Rename equals_ignoring_case => equals_ignoring_ascii_case Let's make it clear that these functions deal with ASCII case only.
2023-03-10 07:48:54 +00:00
return StringUtils::equals_ignoring_ascii_case(view(), other);
AK: Add FlyString::equals_ignoring_case(StringView) And share the code with String by moving the logic to StringUtils. :^)
2020-03-22 12:07:45 +00:00
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
bool DeprecatedFlyString::starts_with(StringView str, CaseSensitivity case_sensitivity) const
AK: Add case insensitive version of starts_with
2020-07-18 16:59:38 +00:00
{
return StringUtils::starts_with(view(), str, case_sensitivity);
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
bool DeprecatedFlyString::ends_with(StringView str, CaseSensitivity case_sensitivity) const
AK: Unify FlyString/StringView::ends_with implementation on StringUtils::ends_with This creates a unified implementation of ends_with with case sensitivity across String/StringView/FlyString.
2020-05-26 10:21:34 +00:00
{
return StringUtils::ends_with(view(), str, case_sensitivity);
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
DeprecatedFlyString DeprecatedFlyString::to_lowercase() const
AK: Add FlyString::to_lowercase() and LogStream operator<<(FlyString)
2020-03-22 18:07:02 +00:00
{
AK+Everywhere: Rename String to DeprecatedString We have a new, improved string type coming up in AK (OOM aware, no null state), and while it's going to use UTF-8, the name UTF8String is a mouthful - so let's free up the String name by renaming the existing class. Making the old one have an annoying name will hopefully also help with quick adoption :^)
2022-12-04 18:02:33 +00:00
return DeprecatedString(*m_impl).to_lowercase();
AK: Add FlyString::to_lowercase() and LogStream operator<<(FlyString)
2020-03-22 18:07:02 +00:00
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
bool DeprecatedFlyString::operator==(DeprecatedString const& other) const
AK: Add some string comparison operators Some of these are very inefficient. It's nice to have some optimization opportunities in the future though. :^)
2020-03-28 08:11:00 +00:00
{
AK: Implement FlyString's comparison operators in terms of StringView's
2022-01-29 14:57:31 +00:00
return m_impl == other.impl() || view() == other.view();
AK: Add some string comparison operators Some of these are very inefficient. It's nice to have some optimization opportunities in the future though. :^)
2020-03-28 08:11:00 +00:00
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
bool DeprecatedFlyString::operator==(StringView string) const
AK: Add some string comparison operators Some of these are very inefficient. It's nice to have some optimization opportunities in the future though. :^)
2020-03-28 08:11:00 +00:00
{
AK: Implement FlyString's comparison operators in terms of StringView's
2022-01-29 14:57:31 +00:00
return view() == string;
AK: Add some string comparison operators Some of these are very inefficient. It's nice to have some optimization opportunities in the future though. :^)
2020-03-28 08:11:00 +00:00
}
AK+Everywhere: Rename FlyString to DeprecatedFlyString DeprecatedFlyString relies heavily on DeprecatedString's StringImpl, so let's rename it to A) match the name of DeprecatedString, B) write a new FlyString class that is tied to String.
2023-01-09 00:23:00 +00:00
bool DeprecatedFlyString::operator==(char const* string) const
AK: Add some string comparison operators Some of these are very inefficient. It's nice to have some optimization opportunities in the future though. :^)
2020-03-28 08:11:00 +00:00
{
AK: Implement FlyString's comparison operators in terms of StringView's
2022-01-29 14:57:31 +00:00
return view() == string;
AK: Add some string comparison operators Some of these are very inefficient. It's nice to have some optimization opportunities in the future though. :^)
2020-03-28 08:11:00 +00:00
}
AK: Add FlyString, a simple flyweight string class 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
2020-03-22 09:12:55 +00:00
}
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