• Rimworld Already Has Short Hash Bad
• Rimworld Already Has Short Hashimoto S
• Rimworld Already Has Short Hash Song

I've become a big fan of. My philosophy is, and Twitter is essentially public instant messaging.

This suits me fine. Well, when Twitter is actually up and running, at least. Its, even today.(I was going to put a screenshot of one of my favorite Twitter messages here, but as I write this Twitter is down. No, I'm not kidding. OK, it's back up.)One of the design constraints of Twitter is that every message is limited to 140 characters.

You quickly learn to embrace and live within those constraints, but if you like to post URLs in your Twitter messages like I do, those 140 characters become very dear. That's probably why Twitter automatically converts any URLs over about 30 characters to short URLs using the service.For instance, let's say I wanted to make a shortened URL version of.It's not a particularly long URL, but every character matters when it comes to Twitter.

I found, so let's see how they compare:.Looks like the best we can do is 3 characters to represent the URL, along with a mandatory 16 characters for the protocol, domain name (everyone drops the leading 'www'), and slashes. That's a total of 19 characters, a nice improvement over the 54 characters that make up the original URL. But using an URL shortening and redirection service isn't without pitfalls of its own. What if the URL redirection service goes belly up, as the did?

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All your previous hyperlinks are instantly and forever broken. What if the redirection service is only sporadically available? That's arguably even worse. The URL no longer contains any hints whatsoever as to the content of the URL. It's completely opaque.

The only way to find out what's behind that hyperlink is to actually click on it. This is not a great user experience for the person doing the clicking. URL redirection services are often used by questionable people for nefarious reasons. Another service, was shut down because of all the spammers abusing their service.Despite all the potential problems, URL shortening services are still useful in the right circumstances. For example, sending out very long hyperlinks in email is always risky; you never know when the email clients will insert line breaks in the links and render them unclickable. Not to mention mobile devices, where space is always at a premium.I often wonder why Google doesn't offer an URL redirection service, as they already keep an index of every URL in the world. The idea of Google disappearing tomorrow, or having availability problems, is far less likely than the seemingly random people and companies who operate these URL redirection services- often for no visible income.But what really struck me about these services is how they're a perfect embodiment of a classical computer science concept- the:In computer science, a hash table, or a hash map, is a data structure that associates keys with values.

The primary operation it supports efficiently is a lookup: given a key (e.g. A person's name), find the corresponding value (e.g. That person's telephone number). It works by transforming the key using a hash function into a hash, a number that is used to index into an array to locate the desired location ('bucket') where the values should be.It doesn't get more fundamental than the keys and values of our beloved hash tables. But some of the services use an absurdly small number of characters as keys- 1YU, 808, cuy - to represent the entire Steve McConnell blog URL. Thinking about how they did that leads you to some interesting solutions. For instance, let's compare to Steve's blog URL:Adler32 399014e3CRC32 78aa9d1aMD2 286c50c2db4fcad77adb4edeb3a937b2MD4 387ac3f6aae7956c4fab176271bb4518MD5 f061a171dfc0684f98b886SHA-1 3c93b6d3fb660d644d0ba3d756e322Even the shortest hash function, the 32-bit CRC, is a bit too long for this usage.

That's 4 bytes which will be at least five ASCII characters. To get a shorter URL, you'd have to switch to a 16-bit CRC. If you're, you just might be able to fit those 2 bytes into three ASCII characters.But is a 16 bit hash enough to represent every URL in the universe? Rich Skrenta:Suppose you're using something like (the GOD of HASH). MD5 takes any length string of input bytes and outputs 128 bits.

The bits are consistently random, based on the input string. If you send the same string in twice, you'll get the exact same random 16 bytes coming out. But if you make even a tiny change to the input string - even a single bit change - you'll get a completely different output hash.So when do you need to worry about collisions?

The working rule-of-thumb here comes from the. Basically you can expect to see the first collision after hashing 2 n/2 items, or 2^64 for MD5.2^64 is a big number. If there are 100 billion urls on the web, and we MD5'd them all, would we see a collision? Well no, since 100,000,000,000 is way less than 2^64:2 64 18,446,744,073,709,551,6162 37 100,000,000,000For a 16-bit hash, our 2 n/2 is a whopping 256; for a 32-bit hash it'd be 65,536.

It's pretty clear that URL shortening services can't rely on traditional hashing techniques, at least not if they want to produce competitively small URLs.My guess is the aggressive URL shortening services are doing a simple iteration across every permutation of the available characters they have as the URLs come in. Each new URL gets a unique three character combination until no more are left. How many URLs would that take? Let's say each character is simple alphanumeric, case sensitive A-Z, a-z, 0-9. You can do somewhat better because more ASCII characters than that are valid in URLs, but let's stick with this for the sake of argument. That's 26 + 26 + 10 or 62 possibilities per character. So with a three character URL, we can represent.62.

62. 62 = 238,328. About 250,000 unique three-character short URLs. Beyond that, they'd be forced to move to four character representations.

Assuming, of course, that the old URLs never expire.

Detailed Description is one of Qt's generic. It stores (key, value) pairs and provides very fast lookup of the value associated with a key.provides very similar functionality to. The differences are:. provides faster lookups than. (See for details.). When iterating over a, the items are always sorted by key. With, the items are arbitrarily ordered.

The key type of a must provide operator. Hash.foreach ( int value, hash)cout. (K key);( const K &key);(K key, seed);( const K &key, seed);The two-arguments overloads take an unsigned integer that should be used to seed the calculation of the hash function. This seed is provided by in order to prevent a family of.

If both a one-argument and a two-arguments overload are defined for a key type, the latter is used by (note that you can simply define a two-arguments version, and use a default value for the seed parameter).Here's a partial list of the C and Qt types that can serve as keys in a: any integer type (char, unsigned long, etc.), any pointer type,. For all of these, the header defines a function that computes an adequate hash value.

Many other Qt classes also declare a overload for their type; please refer to the documentation of each class.If you want to use other types as the key, make sure that you provide operator and a implementation.Example. Member Type Documentation typedef QHash:: ConstIteratorQt-style synonym for. Typedef QHash:: IteratorQt-style synonym for. Typedef QHash:: constkeyvalueiteratorThe typedef provides an STL-style const iterator for and.QHash::constkeyvalueiterator is essentially the same as with the difference that operator.

returns a key/value pair instead of a value.This typedef was introduced in Qt 5.10.See also. Typedef QHash:: differencetypeTypedef for ptrdifft.

Provided for STL compatibility. Typedef QHash:: keytypeTypedef for Key. Provided for STL compatibility.

Typedef QHash:: keyvalueiteratorThe typedef provides an STL-style iterator for and.QHash::keyvalueiterator is essentially the same as with the difference that operator. returns a key/value pair instead of a value.This typedef was introduced in Qt 5.10.See also. Typedef QHash:: mappedtypeTypedef for T. Provided for STL compatibility.

Typedef QHash:: sizetypeTypedef for int. Provided for STL compatibility.

Member Function Documentation QHash:: QHash( && other)Move-constructs a instance, making it point at the same object that other was pointing to.This function was introduced in Qt 5.2. QHash:: QHash(const & other)Constructs a copy of other.This operation occurs in, because is. This makes returning a from a function very fast. If a shared instance is modified, it will be copied (copy-on-write), and this takes.See also. QHash:: QHash( std::initializerlist list)Constructs a hash with a copy of each of the elements in the initializer list list.This function is only available if the program is being compiled in C11 mode.This function was introduced in Qt 5.1.

Rimworld Already Has Short Hash Bad

QHash:: QHashConstructs an empty hash.See also. &QHash:: operator=( && other)Move-assigns other to this instance.This function was introduced in Qt 5.2. &QHash:: operator=(const & other)Assigns other to this hash and returns a reference to this hash. QHash:: QHashDestroys the hash.

References to the values in the hash and all iterators of this hash become invalid. QHash:: beginReturns an pointing to the first item in the hash.See also and. QHash:: begin constThis is an overloaded function. Int QHash:: capacity constReturns the number of buckets in the 's internal hash table.The sole purpose of this function is to provide a means of fine tuning 's memory usage.

In general, you will rarely ever need to call this function. If you want to know how many items are in the hash, call.See also and. QHash:: cbegin constReturns a const pointing to the first item in the hash.This function was introduced in Qt 5.0.See also and.

Rimworld Already Has Short Hashimoto S

QHash:: cend constReturns a const pointing to the imaginary item after the last item in the hash.This function was introduced in Qt 5.0.See also and. Void QHash:: clearRemoves all items from the hash.See also. QHash:: constBegin constReturns a const pointing to the first item in the hash.See also and. QHash:: constEnd constReturns a const pointing to the imaginary item after the last item in the hash.See also and. QHash:: constFind(const Key & key) constReturns an iterator pointing to the item with the key in the hash.If the hash contains no item with the key, the function returns.This function was introduced in Qt 4.1.See also and. QHash:: constKeyValueBegin constReturns a const pointing to the first entry in the hash.This function was introduced in Qt 5.10.See also.

QHash:: constKeyValueEnd constReturns a const pointing to the imaginary entry after the last entry in the hash.This function was introduced in Qt 5.10.See also. Bool QHash:: contains(const Key & key) constReturns true if the hash contains an item with the key; otherwise returns false.See also and. Int QHash:: count(const Key & key) constReturns the number of items associated with the key.See also and.

Int QHash:: count constThis is an overloaded function.Same as. Bool QHash:: empty constThis function is provided for STL compatibility. It is equivalent to , returning true if the hash is empty; otherwise returns false. QHash:: endReturns an pointing to the imaginary item after the last item in the hash.See also and.

QHash:: end constThis is an overloaded function. QHash:: equalrange(const Key & key)Returns a pair of iterators delimiting the range of values first, second), that are stored under key. If the range is empty then both iterators will be equal to.This function was introduced in Qt 5.7. QHash:: equalrange(const Key & key) constThis is an overloaded function.This function was introduced in Qt 5.7. QHash:: erase( pos)Removes the (key, value) pair associated with the iterator pos from the hash, and returns an iterator to the next item in the hash.Unlike and , this function never causes to rehash its internal data structure.

This means that it can safely be called while iterating, and won't affect the order of items in the hash. Hash;hash.reserve( 20000);for ( int i = 0; i & other)Swaps hash other with this hash.

Rimworld Already Has Short Hash Song

This operation is very fast and never fails.This function was introduced in Qt 4.8. T QHash:: take(const Key & key)Removes the item with the key from the hash and returns the value associated with it.If the item does not exist in the hash, the function simply returns a. If there are multiple items for key in the hash, only the most recently inserted one is removed.If you don't use the return valueis more efficient.See also. QHash:: uniqueKeys constReturns a list containing all the keys in the map.

Keys that occur multiple times in the map (because items were inserted with , or was used) occur only once in the returned list.This function was introduced in Qt 4.2.See also and. &QHash:: unite(const & other)Inserts all the items in the other hash into this hash. If a key is common to both hashes, the resulting hash will contain the key multiple times.See also.

Const T QHash:: value(const Key & key) constReturns the value associated with the key.If the hash contains no item with the key, the function returns a. If there are multiple items for the key in the hash, the value of the most recently inserted one is returned.See also , , , and. Const T QHash:: value(const Key & key, const T & defaultValue) constThis is an overloaded function.If the hash contains no item with the given key, the function returns defaultValue. QHash:: values constReturns a list containing all the values in the hash, in an arbitrary order. If a key is associated with multiple values, all of its values will be in the list, and not just the most recently inserted one.The order is guaranteed to be the same as that used by.See also and.

QHash:: values(const Key & key) constThis is an overloaded function.Returns a list of all the values associated with the key, from the most recently inserted to the least recently inserted.See also and. Bool QHash:: operator!=(const & other) constReturns true if other is not equal to this hash; otherwise returns false.Two hashes are considered equal if they contain the same (key, value) pairs.This function requires the value type to implement operator.See also. Bool QHash:: operator(const & other) constReturns true if other is equal to this hash; otherwise returns false.Two hashes are considered equal if they contain the same (key, value) pairs.This function requires the value type to implement operator.See also. T &QHash:: operator(const Key & key)Returns the value associated with the key as a modifiable reference.If the hash contains no item with the key, the function inserts a into the hash with the key, and returns a reference to it. If the hash contains multiple items with the key, this function returns a reference to the most recently inserted value.See also and. Const T QHash:: operator(const Key & key) constThis is an overloaded function.Same as. Related Non-Members int QHash:: qGlobalQHashSeedReturns the current global seed.The seed is set in any newly created.

See about how this seed is being used by.This function was introduced in Qt 5.6.See also. QHash:: qHash( char key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash(const & url, seed = 0)Returns the hash value for the url. If specified, seed is used to initialize the hash.This function was introduced in Qt 5.0.

QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.The hash value is independent of the order of elements in key, that is, sets that contain the same elements hash to the same value.This function was introduced in Qt 5.5. QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.Type T must be supported by.This function was introduced in Qt 5.8. QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( signed char key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0.

QHash:: qHash(const T. key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( short key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0.

QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( int key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.Types T1 and T2 must be supported by.This function was introduced in Qt 5.0. QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0.

QHash:: qHash(const std::pair & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.Types T1 and T2 must be supported by.Note: The return type of this function is not the same as that of. ((key.first, key.second), seed);The two functions use different hashing algorithms; due to binary compatibility constraints, we cannot change the algorithm to match the std::pair one before Qt 6.This function was introduced in Qt 5.7. QHash:: qHash(const & key, seed = 0)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.6.

QHash:: qHash( long key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash( float key, seed = 0)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.3. QHash:: qHash( double key, seed = 0)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.3. QHash:: qHash( long double key, seed = 0)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.3. QHash:: qHash(const key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0.

QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0. QHash:: qHash(const & key, seed =.)Returns the hash value for the key, using seed to seed the calculation.This function was introduced in Qt 5.0.

QHash:: qHashBits(const void. p, sizet len, seed =.)Returns the hash value for the memory block of size len pointed to by p, using seed to seed the calculation.Use this function only to implement for your own custom types. For example, here's how you could implement a overload for std::vector.